Faculty Profiles - GOKON Nobuyuki

Temperature impacts on reactivity of La0.7A0.3Mn0.9Cr0.1O3-δ of perovskite oxides in a thermochemical two-step H2O/CO2 splitting Reviewed

Hiroki Sawaguri, Yoshikazu Iwamura, Selvan Bellan, Nobuyuki Gokon

AIP Conf. Proc., SolarPACES: SOLAR POWER & CHEMICAL ENERGY SYSTEMS: 27th International Conference on Concentrating Solar Power and Chemical Energy Systems 2815 130007 - 130007 2023.10

Effects of heating rate and drying condition on thermochemical pyrolysis of spent coffee grounds in a windowed internally-circulating fluidized bed reactor Reviewed

Nobuyuki Gokon, Yusuke Sasada, Hiroshi Seto, Tadaaki Shimizu, Selvan Bellan

AIP Conf. Proc., SolarPACES: SOLAR POWER & CHEMICAL ENERGY SYSTEMS: 27th International Conference on Concentrating Solar Power and Chemical Energy Systems 2815 130003 - 130003 2023.10

Redox performance and optimization of the chemical composition of lanthanum-strontium-manganese-based perovskite oxide for two-step thermochemical CO2 splitting Invited Reviewed

Hiroki Sawaguri, Daichi Yasuhara, Nobuyuki Gokon

Processes 11 2717 2023.9

Progress in concentrated solar power, photovoltaics, and integrated power plants towards expanding the introduction of renewable energy in the Asia/Pacific region Invited Reviewed

Nobuyuki Gokon

Current Sustainable Renewable Energy Reports 10 250 - 263 2023.8

Comparative Study of Heat-Discharging Kinetics of Fe-Substituted Mn2O3/Mn3O4 Being Subjected to Long-Term Cycling for Thermochemical Energy Storage Invited Reviewed

Nobuyuki Gokon, Fumiya Ohashi, Hiroki Sawaguri, Kosuke Hayashi

Energies 16 ( 8 ) 3367 2023.4

Long-Term Thermal Cycling Test and Heat-Charging Kinetics of Fe-Substituted Mn2O3 for Next-Generation Concentrated Solar Power Using Thermochemical Energy Storage at High Temperatures Invited Reviewed

Nobuyuki Gokon, Kosuke Hayashi, Hiroki Sawaguri, Fumiya Ohashi

Energies 15 ( 13 ) 4812-1 - 4812-24 2022.6

A review on high‐temperature thermochemical heat storage: Particle reactors and materials based on solid–gas reactions

Selvan Bellan, Tatsuya Kodama, Nobuyuki Gokon, Koji Matsubara

WIREs Energy and Environment 11 ( 5 ) 2022.5

Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

In order to produce electricity beyond insolation hours and supply to the electrical grid, thermal energy storage (TES) system plays a major role in CSP (concentrated solar power) plants. Current CSP plants use molten salts as both sensible heat storage media and heat transfer fluid, to operate up to 560°C. To meet the future high operating temperature and efficiency, thermochemical storage (TCS) emerged as an attractive alternatives for next generation CSP plants. In these systems, the solar thermal energy is stored by endothermic reaction and subsequently released when the energy is needed by exothermic reversible reaction. This review compares and summarizes different thermochemical storage systems that are currently being investigated, especially TCS based on metal oxides. Various experimental, numerical, and technological studies on the development of particle reactors and materials for high‐temperature TCS applications are presented. Advantages and disadvantages of different types heat storage systems (sensible, latent, and thermochemical), and particle receivers (stacked, fluidized, and entrained), have been discussed and reported.

This article is categorized under:Sustainable Energy > Solar Energy

Emerging Technologies > Energy Storage

Emerging Technologies > Materials

DOI： 10.1002/wene.440

Fluidization behavior of redox metal oxide and spinel particles to develop high-energy-density thermal energy storage system for concentrated solar power applications

Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/wene.440

Two-step thermochemical CO2 splitting using partially-substituted perovskite oxides of La0.7Sr0.3Mn0.9X0.1O3 for solar fuel production Invited Reviewed

Hiroki Sawaguri, Nobuyuki Gokon, Kosuke Hayashi, Yoshikazu Iwamura, Daichi Yasuhara

Frontiers in Energy Research, section Solar Energy 10 872959-1 - 872959-21 2022.5

Genta TSURUMAKI, Selvan BELLAN, Koji MATSUBARA, Tatsuya KODAMA, Mitsuho NAKAKURA, Nobuyuki GOKON, Hyun SEOK CHO, Karthik MANI, Sakthivel SHANMUGASUNDARAM

Journal of Thermal Science and Technology 17 ( 2 ) 22 - 00061 2022

Development of Synthesis and Fabrication Process for Mn-CeO2 Foam via Two-Step Water-Splitting Cycle Hydrogen Production

Hyun-Seok Cho, Tatsuya Kodama, Nobuyuki Gokon, Selvan Bellan, Jong-Kyu Kim

Energies 14 ( 21 ) 6919 - 6919 2021.10

Publishing type：Research paper (scientific journal) Publisher：MDPI AG

The effects of doping manganese ions into a cerium oxide lattice for a thermochemical two-step water-splitting cycle to produce oxygen and hydrogen and new synthesis methods were experimentally investigated. In order to comparison of oxygen/hydrogen producing performance, pristine CeO2, a coprecipitation method for Mn-CeO2, and a direct depositing method for Mn-CeO2 with different particle sizes (50~75, 100–212, over 212 μm) and doping extents (0, 5, 15 mol%) were tested in the context of synthesis and fabrication processes of reactive metal oxide coated ceramic foam devices. Sample powders were coated onto zirconia (magnesium partially stabilized zirconia oxide, MPSZ) porous foam at 30 weight percent using spin coating or a direct depositing method, tested using a solar reactor at 1400 °C as a thermal reduction step and at 1200 °C as a water decomposition step for five repeated cycles. The sample foam devices were irradiated using a 3-kWth sun-simulator, and all reactive foam devices recorded successful oxygen/hydrogen production using the two-step water-splitting cycles. Among the seven sample devices, the 5 mol% Mn-CeO2 foam device, that synthesized using the coprecipitation method, showed the greatest hydrogen production. The newly suggested direct depositing method, with its contemporaneous synthesis and coating of the Mn-CeO2 foam device, showed successful oxygen/hydrogen production with a reduction in the manufacturing time and reactants, which was lossless compared to conventional spin coating processes. However, proposed direct depositing method still needs further investigation to improve its stability and long-term device durability.

DOI： 10.3390/en14216919

Phase change material of copper-germanium alloy as solar latent heat storage at high temperatures Invited Reviewed

Nobuyuki Gokon, Chew Shun Jie, Yuya Nakano, Shogo Okazaki, Tatsuya Kodama, Tsuyoshi Hatamachi, Selvan Bellan

Frontiers in Energy Research, section Solar Energy 9 696213-1 - 696213-19 2021.6

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Frontiers Media SA

A copper–germanium alloy (Cu–Ge alloy) was examined as a phase change material, at temperatures exceeding 600°C, for latent heat storage in solar thermal applications. First, the thermo-physical properties of the Cu–Ge alloy were examined using differential scanning calorimetry, thermomechanical analysis, and laser flash analysis. Second, to evaluate the thermal response and reliability of the Cu–Ge alloy, the cyclic properties of thermal charge/discharge were examined under various thermal conditions. The alloys obtained after the tests were examined for their chemical compatibility with the stainless steel container using an electron probe micro analyzer. The elemental distribution of each Cu–Ge alloy was evaluated using cyclic performance tests. Finally, the chemical compatibility of the Cu–Ge alloy was evaluated using a high-temperature test with candidate materials of a phase change material container vessel [stainless steel (SUS310S), Inconel625, silicon carbide (SiC), and alumina (Al2O3)]. The Cu–Ge alloy exhibited significant potential as a latent heat storage material in next-generation solar thermal power plants because it demonstrates various advantages, including a superior storage capacity at a temperature of 644°C, temperature coherence to the phase diagram, a quick thermal response, satisfactory cyclic behavior of charge/discharge modes, a thermodynamically stable metallographic structure, and non-reactivity with container ceramic materials (SiC and Al2O3).

DOI： 10.3389/fenrg.2021.696213

Chemical compatibility of Cu-Ge alloy with container materials for latent heat storage system Reviewed

Nobuyuki Gokon, Chew Shun Jie, Selvan Bellan, Tatsuya Kodama, Tsuyoshi Hatamachi, Hyunseok Cho

AIP Conference Proceedings 2303 2020.12

Numerical analysis on solidification process of PCM in triplex-tube thermal energy storage system

Koya Hirai, Selvan Bellan, Koji Matsubara, Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho

AIP Conference Proceedings 2303 2020.12

Thermochemical two-step CO<inf>2</inf> splitting using La<inf>0.7</inf>Sr<inf>0.3</inf>Mn<inf>0.9</inf>Cr<inf>0.1</inf>O<inf>3</inf> of perovskite oxide for solar fuel production Reviewed

Hiroki Sawaguri, Nobuyuki Gokon, Naoki Ito, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

AIP Conference Proceedings 2303 2020.12

Experimental Study of Mn-CeO<inf>2</inf> Coated Ceramic Foam Device for Two-step Water Splitting Cycle Hydrogen Production with 3kW Sun-simulator

Hyun Seok Cho, Tatsuya Kodama, Nobuyuki Gokon, Selvan Bellan, Naoyoshi Nishigata

AIP Conference Proceedings 2303 2020.12

Thermochemical H<inf>2</inf>O splitting using LaSrMnCrO<inf>3</inf> of perovskite oxides for solar hydrogen production Reviewed

Nobuyuki Gokon, Kazuki Hara, Naoki Ito, Hiroki Sawaguri, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

AIP Conference Proceedings 2303 2020.12

Thermal charge/discharge performance of iron–germanium alloys as phase change materials for solar latent heat storage at high temperatures Reviewed

Nobuyuki Gokon, Chew Shun Jie, Yuya Nakano, Tatsuya Kodama, Selvan Bellan, Hyun seok Cho

Journal of Energy Storage 30 101420-1 - 101420-18 2020.3

Thermochemical two-step water splitting cycle using perovskite oxides based on LaSrMnO3 redox system for solar H2 production Reviewed

Nobuyuki Gokon, Kazuki Hara, Yuta Sugiyama, Selvan Bellan, Tatsuya Kodama, Cho Hyun-seok

Thermochimica Acta 680 178374-1 - 178374-13 2019.10

Heat transfer and particulate flow analysis of a 30 kW directly irradiated solar fluidized bed reactor for thermochemical cycling Reviewed

Selvan Bellan, Tatsuya Kodama, Koji Matsubara, Nobuyuki Gokon, Hyun Seok Cho, Kousuke Inoue

Chemical Engineering Science 203 511 - 525 2019.8

Fe-doped manganese oxide redox material for thermochemical energy storage at high-temperatures Reviewed

Nobuyuki Gokon, Aoi Nishizawa, Takehiro Yawata, Selvan Bellan, Tatsuya Kodama, Hyun Seok Cho

AIP Conference Proceedings 2126 2019.7

Thermal performance of a 30 kW fluidized bed reactor for solar gasification: A CFD-DEM study Reviewed

Selvan Bellan, Tatsuya Kodama, Koji Matsubara, Nobuyuki Gokon, Hyun Seok Cho, Kousuke Inoue

Chemical Engineering Journal 1287 - 1300 2019.3

Thermochemical behavior of perovskite oxides based on LaxSr1-x(Mn, Fe, Co)O3-δ and BaySr1-yCoO3-δ redox system for thermochemical energy storage at high temperatures Reviewed

Nobuyuki Gokon, Takehiro Yawata, Selvan Bellan, Tatsuya Kodama, Hyun-Seok Cho

Energy 171 971 - 980 2019.3

Development of a 5kWth internally circulating fluidized bed reactor containing quartz sand for continuously-fed coal-coke gasification and a beam-down solar concentrating system Reviewed

Nobuyuki Gokon, Satoshi Kumaki, Yosuke Miyaguchi, Selvan Bellan, Tatsuya Kodam, Hyunseok Cho

Energy 166 1 - 16 2019

Particle fluidized bed receiver/reactor with a beam-down solar concentrating optics: Performance test of two-step water splitting with ceria particles using 30-kW<inf>th</inf> sun-simulator

Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho, Selvan Bellan, Koji Matsubara, Kousuke Inoue

AIP Conference Proceedings 2033 2018.11

Numerical and experimental study on granular flow and heat transfer characteristics of directly-irradiated fluidized bed reactor for solar gasification Reviewed

Selvan Bellan, Nobuyuki Gokon, Koji Matsubara, Hyun Seok Cho, Tatsuya Kodama

International journal of hydrogen energy 43 ( 34 ) 1 - 15 2018.8

A CFD-DEM study of hydrodynamics with heat transfer in a gas-solid fluidized bed reactor for solar thermal applications Reviewed

Selvan Bellan, Koji Matsubara, Hyun Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 116 377 - 392 2018.1

Heat transfer analysis of 5kWth circulating fluidized bed reactor for solar gasification using concentrated Xe light radiation Reviewed

Selvan Bellan, Nobuyuki Gokon, Koji Matsubara, Hyun Seok Cho, Tatsuya Kodama

Energy 160 245 - 256 2018

Fe-doped Mn2O3/Mn3O4 redox material for thermochemical energy storage at high-temperatures Reviewed

Nobuyuki Gokon, Aoi Nishizawa, Takehiro Yawata, Hyun-seok Cho, Selvan Bellan, Tatsuya Kodama

SolarPACES 2018, Casabranca, Morocco, October 2-5, 2018 2018

Heat transfer and fluid flow analysis of a fluidized bed reactor for beam-down optics Reviewed

Selvan Bellan, Tatsuya Kodama, Koji Matsubara, Nobuyuki Gokon, Hyun Seok Cho

SolarPACES 2018, Casabranca, Morocco, October 2-5, 2018 2018

Particles Fluidized Bed Receiver/Reactor with a Beam-Down Solar Concentrating Optics: First Performance Test on Two-Step Water Splitting with Ceria Using a Miyazaki Solar Concentrating System Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Hunseok Cho, Selvan Bellan

SolarPACES 2018, Casabranca, Morocco, October 2-5, 2018 2018

Reactivity of Mn-Doped Ceria for a Thermochemical Two-Step Water-splitting cycle at low temperature Reviewed

Enzo Shida, Kiko Naito, Tsuyoshi Hatamachi, Selvan Bellan, Cho Hyun-Seok, Nobuyuki Gokon, Tatsuya Kodama

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Thermochemical test of quartz window type fluidized bed solar reactor by 30 kW sun simulator Reviewed

Kosuke Inoue, Kazuya Senuma, Tsuyoshi Hatamachi, Hyun Seok Cho, Selvan Bellen, Nobuyuki Gokon, Tatsuya Kodama

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Research on thermal charge / discharge cyclic performance of new thermal storage materials for solar thermal power generation Reviewed

Asato Shirai, Mami Kaneko, Selvan Bellan, Hyun Seok Cho, Tsuyoshi Hatamachi, Nobuyuki Gokon, Tatsuya Kodama

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Solar gasification of coals by a windowed fluidized bed reactor with beam-down optics Reviewed

Shimpei Takagi, T. Hatamachi, S.Vellan, C. Hyunseok, N. Gokon, T. Kodama

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Thermochemical tewo-step water-splitting cyclew of the CeO2/MPSZ ractive foam device by the high temperature solar furnace Reviewed

Issei Tsuruma, Manami Ymada, Hun-Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Study on the reactivity of perovskite oxides in thermochemical storage cycle Reviewed

Takehiro Yawata, Tsuyoshi Hatamachi, Vellan Selvan, Hunseok Cho, Tatsuya Kodama, Nobuyuki Gokon

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Development of Thermochemical Two-Step Water Splitting Cycle of the CeO2/M-CeO2 Foam Device by the 3 kW Sun-simulator Reviewed

Hyun-Seok Cho, Issei Tsuruma, Manami Yamada, Tatsuya Kodama, Nobuyuki Gokon

The 6th International Symposium on Fusion Technology, Niigata University, Niigata, Japan, January 26-28, 2018. 2018

Conjugated radiation-convection-conduction heat transfer analysis of volumetric receiver with highly concentrated radiation

Mitsuho Nakakura, Selvan Bellan, Hyun-Seok Cho, Koji Matsubara, Nobuyuki Gokon, Tatsuya Kodama

International Heat Transfer Conference 2018- 7866 - 7873 2018

Gas-solid flow and heat transfer characteristics of a fluidized bed reactor for solar thermal applications

Selvan Bellan, Koji Matsubara, Nobuyuki Gokon, Tatsuya Kodama, Hyun Seok Cho, Issei Tsuchida

International Heat Transfer Conference 2018- 6519 - 6527 2018

Buoyancy-opposed volumetric solar receiver with beam-down optics irradiation Reviewed

Mitsuho Nakakura, Koji Matsubara, Hyun-Seok Cho, Tatsuya Kodama, Nobuyuki Gokon, Selvan Bellan, Kazuo Yoshida

Energy 141 2337 - 2350 2017.12

Particle reactors for solar thermochemical processes Reviewed

Tatsuya Kodama, Selvan Bellan, Nobuyuki Gokon, Hyun Seok Cho

SOLAR ENERGY 156 113 - 132 2017.11

CFD-DEM investigation of particles circulation pattern of two-tower fluidized bed reactor for beam-down solar concentrating system Reviewed

Selvan Bellan, Koji Matsubara, Cho Hyun Cheok, Nobuyuki Gokon, Tatsuya Kodama

POWDER TECHNOLOGY 319 228 - 237 2017.9

Development and Experimental Study for Hydrogen Production from the Thermochemical Two-step Water Splitting Cycles with a CeO2 Coated New Foam Device Design Using Solar Furnace System Reviewed

Hyun Seok Cho, Tatsuya Kodama, Nobuyuki Gokon, Jong Kyu Kim, Sang Nam Lee, Yong Heack Kang

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016) 1850 2017

CFD-DEM Investigation on Flow and Temperature Distribution of Ceria Particles in a Beam-Down Fluidized Bed Reactor Reviewed

Selvan Bellan, Koji Matsubara, Hyun Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

SolarPACES 2017, Santiago, Chili, September 26-29, 2017 2017

THERMOCHEMICAL TWO-STEP WATER-SPLITTING USING PEROVSKITE OXIDE FOR SOLAR HYDROGEN PRODUCTION Reviewed

Yuta Sugiyama, Nobuyuki Gokon, Hyun-Seok Cho, Selvan Bellan, Tsuyoshi Hatamachi, Tatsuya Kodama

Asian Conference on thermal sciences 2017, ICC JEJU, JEJU ISLAND, KOREA, March 26-30, 2017. 2017

HYDROGEN PRODUCTIVITY AND REPEATABILITY FOR THERMOCHEMICAL TWO-STEP WATER-SPLITTING CYCLE USING MN-DOPED CERIUM OXIDES Reviewed

Kiko Naito, Nobuyuki Gokon, Hyun-Seok Cho, Selvan Bellan, Tsuyoshi Hatamachi, Tatsuya Kodama

Asian Conference on thermal sciences 2017, ICC JEJU, JEJU ISLAND, KOREA, March 26-30, 2017. 2017

SOLAR RECEIVER/REACTOR OF FLUIDIZED BED WITH MIYAZAKI BEAM-DOWN SOLAR CONCENTRATING SYSTEM Reviewed

Kazuya Senuma, Nobuyuki Gokon, Hyun-Seok Cho, Selvan Bellan, Tsuyoshi Hatamachi, Tatsuya Kodama

Asian Conference on thermal sciences 2017, ICC JEJU, JEJU ISLAND, KOREA, March 26-30, 2016. 2017

Investigation of reaction temperature of cerium oxide in two-step carbon dioxide splitting cycles Reviewed

Kazuya Senuma, Nobuyuki Gokon, Hyun-Seok Cho, Selvan Bellan, Tsuyoshi Hatamachi, Tatsuya Kodama

Asian Conference on thermal sciences 2017, ICC JEJU, JEJU ISLAND, KOREA, March 26-30, 2016. 2017

HEAT TRANSFER ANALYSIS OF AN OVAL CERAMIC CONTAINER ENCAPSULATED BY PHASE CHANGE MATERIAL FOR THERMAL ENERGY STORAGE SYSTEM Reviewed

Selvan Bellan, Shunichi Tazawa, Tomohiro Nakamata, Cho Hyun Cheok, Nobuyuki Gokon, Koji Matsubara, Tatsuya Kodama

Asian Conference on thermal sciences 2017, ICC JEJU, JEJU ISLAND, KOREA, March 26-30, 2016. 2017

NUMERICAL SIMULATION OF VOLUMETRIC AIR RECEIVER FOR BEAM DOWN REFLECTOR Reviewed

M. Nakakura, K. Matsubara, S. Kawagoe, S. Bellan, H. S. Cho, N. Gokon, T. Kodama

Asian Conference on thermal sciences 2017, ICC JEJU, JEJU ISLAND, KOREA, March 26-30, 2016. 2017

Melting process of PCM in ceramic capsule for solar thermal storage Reviewed

Selvan Bellan, Shunichi Tazawa, Koji Matsubara, Cho Hyun Seok, Nobuyuki Gokon, Tatsuya Kodama

SOLARIS Conference 27 - 28 Jul 2017, London, UK. 2017

Heat Transfer Analysis of Fluidized Bed Particle Receiver for High-Temperature Solar Concentration Reviewed

Koji Matsubara, Atsushi Sakurai, Takahiro Suzuki, Selvan Bellan, Nobuyuki Gokon, Cho Hyun-Seok, Tatsuya Kodama

SOLARIS Conference 27 - 28 Jul 2017, London, UK 2017

Discrete ordinates simulation of volumetric solar receiver with beam-down irradiation and its verification using big sun simulator Reviewed

Mitsuho Nakakura, Koji Matsubara, Yuki Aoki, Selvan Bellan, Cho Hyun-Seok, Nobuyuki Gokon, Tatsuya Kodama

SOLARIS Conference 27 - 28 Jul 2017, London, UK 2017

Preliminary Tests of Batch Type Fluidized Bed Reactor for Development of Continuously-Feeding Fluidized Bed Reactor - an Elevated Temperature and Gasification Processes ? Reviewed

Nobuyuki Gokon, Shinpei Takagi, Hyun-seok Cho, Selvan Bellan, Tatsuya Kodama

SolarPACES 2017, Santiago, Chili, September 26-29, 2017 2017

Thermal Storage/Discharge Performances of Cu-Si Alloy for Solar Thermochemical Process Reviewed

Nobuyuki Gokon, Tomoya Yamaguchi, Hyun-seok Cho, Selvan Bellan, Tsuyoshi Hatamachi, Tatsuya Kodama

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016) 1850 2017

Numerical Analysis of Fluid Flow and Heat Transfer During Melting Inside a Cylindrical Container for Thermal Energy Storage System Reviewed

Selvan Bellan, Cho Hyun Cheok, Nobuyuki Gokon, Koji Matsubara, Tatsuya Kodama

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016) 1850 2017

Particles Fluidized Bed Receiver/Reactor Tests with Quartz Sand Particles Using a 100-kW(th) Beam-Down Solar Concentrating System at Miyazaki Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho, Koji Matsubara, Hiroshi Kaneko, Kazuya Senuma, Sumie Itoh, Shin-nosuke Yokota

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016) 1850 2017

4-5-4 Study on the reactivity of perovskite oxide in chemical thermal storage cycle

NAKAMURA Shohei, EDA Shunsuke, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 26 176 - 177 2017

Language：Japanese Publisher：The Japan Institute of Energy

Perovskite-type metal oxides were synthesized by Pechini method. Then, they were examined its reduction/oxidation reactivity by thermogravimetric analysis. After TGA testing, high redox-capacity materials were selected, and its reaction enthalpy was measured by DSC analysis. These results showed that the redox reactivity was improved by decreasing Lanthanum ion activity and increasing Barium ion concentration of samples. It was revealed that Ba-containing samples are potential thermochemical energy storage application.

DOI： 10.20550/jietaikaiyoushi.26.0_176

4-5-2 Thermochemical two-step water-splitting of a windowed fluidized bed solar reactor by 30 kW sun simulator

INOUE Kosuke, SENUMA Kazuya, HATAMACHI Tsuyoshi, CHO Hyun Seok, BELLEN Selvan, GOKON Nobuyuki, KODAMA Tatsuya, KANEKO Hiroshi

Proceedings of the Annual Conference of The Japan Institute of Energy 26 172 - 173 2017

Language：Japanese Publisher：The Japan Institute of Energy

Mitaka Koki Co., LTd., Miyazaki prefecture, Miyazaki University and Niigata University build a beam-down (BD) solar concentrating system in August 2012 at Miyazaki University for solar demonstration of the receiver/reactor. Both universities started an R&D joint project since 2011 to demonstrate the up-scaled receiver/reactor under a concentrated solar radiation. Niigata University has a 30 kW sun-simulator for testing of solar reactor. In this study, the first results of the receiver/reactor using 30 kW sun-simulator are reported. Quartz sand is used as a fluidization particle to examine performances of the receiver/reactor, while air is used as a passing gas. The temperatures of air and quartz sand are shown in the paper. In addition, cerium oxide powder is used as a fluidization/reaction particle to perform thermochemical two-step water-splitting cycle. The oxygen and hydrogen production are reported in this paper.

DOI： 10.20550/jietaikaiyoushi.26.0_172

Cyclic thermal storage/discharge performances of a hypereutectic Cu-Si alloy under vacuum for solar thermochemical process Reviewed

Nobuyuki Gokon, Tomoya Yamaguchi, Tatsuya Kodama

ENERGY 113 1099 - 1108 2016.10

Cyclic thermal storage/discharge performances of hypereutectic alloy for solar latent heat storage Reviewed

Tomoya Yamaguchi, Nobuyuki Takahashi, Tsuyoshi Hatamachi, Hyun-Seok Cho, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2016, Harbin Institute of Technology, Harbin, China, January 19-21, 2016. 2016

Particles Fluidized Bed Receiver/Reactor with a Beam-Down Solar Concentrating Optics: 30-kW(th) Performance Test Using a Big Sun-Simulator Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Hyun Seok Cho, Koji Matsubara, Tetsuro Etori, Akane Takeuchi, Shin-nosuke Yokota, Sumie Ito

SOLARPACES 2015: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS 1734 2016

Experimental Demonstration and Numerical Model of a Point Concentration Solar Receiver Evaluation System Using a 30 kWth Sun Simulator Reviewed

M. Nakakura, M. Ohtake, K. Matsubara, K. Yoshida, H. S. Cho, T. Kodama, N. Gokon

SOLARPACES 2015: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS 1734 2016

Synthesis of CeO2 particles by spray dryer method for solar hydrogen production Reviewed

Sumie Ito, Shiori Abe, Tsuyoshi Hatamachi, Cho Hyunseok, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2016, Harbin Institute of Technology, Harbin, China, January 19-21, 2016. 2016

Cold Test with a Benchtop Set-up for Fluidized Bed Reactor Using Quartz Sand to Simulate Gasification of Coal Cokes by Concentrated Solar Radiation Reviewed

Nobuyuki Gokon, Tomoaki Tanabe, Tadaaki Shimizu, Tatsuya Kodama

SOLARPACES 2015: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS 1734 2016

4-3-3 The development of the quartz window type particle fluidized bed solar receiver / reactor for Miyazaki beam-down solar concentrating system

SENUMA Kazuya, YOKOTA Shinnosuke, ITOH Sumie, CHO Hyun Seok, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya, KANEKO Hiroshi

Proceedings of the Annual Conference of The Japan Institute of Energy 25 136 - 137 2016

Language：Japanese Publisher：The Japan Institute of Energy

Mitaka Koki Co., LTd., Miyazaki prefecture, Miyazaki University and Niigata University build a beam-down (BD) solar concentrating system in August 2012 at Miyazaki University for solar demonstration of the receiver/reactor. Both universities started an R&D joint project since 2011 to demonstrate the up-scaled receiver/reactor under a concentrated solar radiation. In this study, the first demonstration results of the receiver/reactor using BD solar concentrating system are reported. Quartz sand is used as a fluidization particle to examine performances of the receiver/reactor, while air is used as a passing gas. The temperatures of air and quartz sand are shown in the paper.

DOI： 10.20550/jietaikaiyoushi.25.0_136

4-3-1 High Activation of Other Metal Doped Ceria in a Thermochemical Two-StepWater-splitting cycle

NAITO Kiko, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 25 132 - 133 2016

Language：Japanese Publisher：The Japan Institute of Energy

Solar hydrogen production via thermochemical water-splitting cycle by concentrated high-temperature heat has extensively investigated in a world. In this study, a thermochemical two-step water-splitting using redox material of Mn doped-ceria powder was examined in consecutive thermal reduction-decomposition steps by switching a passing gas from high purity Nitrogen in the TR step into the gas mixture of N2 and steam in the WD step. The reactivity of Mn doped-ceria powder with 5-30 mol% Mn doping was evaluated in this study.

DOI： 10.20550/jietaikaiyoushi.25.0_132

4-3-2 Reactivity of Thermochemical Two-Step Water-Splitting cycle using LaSrAlMnO3-δ

SUGIYAMA Yuta, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 25 134 - 135 2016

Language：Japanese Publisher：The Japan Institute of Energy

Perovskite oxide powder was examined as a redox material on reactivity of thermochemical two-step water-splitting for converting high-temperature heat into chemical fuels. In this study, in order to examine reactivity of the redox material at lower temperature in the thermochemical two-step water-splitting cycle, the amount of oxygen and hydrogen, its stoichiometry were investigared using LaSrAlMnO3-δ powder at thermal reduction temperature of 1350 °C and water-decomposition temperture of 1000 °C.

DOI： 10.20550/jietaikaiyoushi.25.0_134

Oxygen and hydrogen productivities and repeatable reactivity of 30-mol%-Fe-, Co-, Ni-, Mn-doped CeO2-delta for thermochemical two-step water-splitting cycle Reviewed

Nobuyuld Gokon, Toshinori Suda, Tatsuya Kodama

ENERGY 90 1280 - 1289 2015.10

Thermochemical reactivity of 5-15 mol% Fe, Co, Ni, Mn-doped cerium oxides in two-step water-splitting cycle for solar hydrogen production Reviewed

Nobuyuki Gokon, Toshinori Suda, Tatsuya Kodama

THERMOCHIMICA ACTA 617 ( 10 ) 179 - 190 2015.10

Improved operation of solar reactor for two-step water-splitting H-2 production by ceria-coated ceramic foam device Reviewed

H. S. Cho, N. Gokon, T. Kodama, Y. H. Kang, H. J. Lee

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 40 ( 1 ) 114 - 124 2015.1

Steam gasification of coal cokes by internally circulating fluidized-bed reactor by concentrated Xe-light radiation for solar syngas production Reviewed

Nobuyuki Gokon, Takuya Izawa, Tatsuya Kodama

ENERGY 79 264 - 272 2015.1

Laboratory experiment and simulation of higherature fluidized bed air receiver for concentrated solar power generation Reviewed

Koji Matsubara, Yuki Kazuma, Atsushi Sakurai, Tatsuya Kodama, Nobuyuki Gokon, Hyun-Seok Cho, Kazuo Yoshida, Yoshinori Nagase

Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy 94 ( 11 ) 1323 - 1329 2015

Cyclic properties of thermal storage/discharge for Al-Si alloy in vacuum for solar thermochemical fuel production Reviewed

N. Gokon, S. Nakamura, T. Yamaguchi, T. Kodama

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014 69 1759 - 1769 2015

Flowability control of bed materials in a fluidized bed reactor for solar thermochemical process Reviewed

T. Etori, N. Gokon, A. Takeuchi, T. Miki, M. Yokota, T. Kodama

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014 69 1741 - 1749 2015

Internally-circulating fluidized bed reactor using thermal storage material for solar coal coke gasification Reviewed

T. Abe, N. Gokon, T. Izawa, T. Kodama

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014 69 1722 - 1730 2015

Simulation of flux distributions on the foam absorber with solar reactor for thermo-chemical two-step water splitting H-2 production cycle by the 45 kW(th) KIER solar furnace Reviewed

H. S. Cho, N. Gokon, T. Kodama, Y. H. Kang, J. K. Kim

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014 69 790 - 801 2015

Development of a receiver evaluation system using 30 kWth point concentration solar simulator Reviewed

M. Nakakura, M. Ohtake, K. Matsubara, K. Yoshida, H. S. Cho, T. Kodama, N. Gokon

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014 69 497 - 505 2015

Cold model experiments on fluidization behavior of mixture of quartz sand and coal cokes for solar gasification Reviewed

Nobuyuki Gokon, Tomoaki Tanabe, Tadaaki Shimizu, Tatsuya Kodama

SolarPACES 2015, Cape Town, South Africa, October 13-16, 2015. 2015

Numerical modeling of a two-tower type fluidized receiver for high temperature solar concentration by a beam-down reflector system Reviewed

K. Matsubara, H. Sakai, Y. Kazuma, A. Sakurai, T. Kodama, N. Gokon, H. S. Cho, K. Yoshida

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014 69 487 - 496 2015

Cold testings of a windowed fluidized bed reactor using quartz sand for solar gasification of coke Reviewed

N. Gokon, T. Tanabe, H. S. Cho, T. Hatamachi, T. Kodama

ISES Solar World Congress 2015, Conference Proceedings 799 - 805 2015

Redox and fluidization performances of Co3O4/CoO for solar Thermochemical energy storage Reviewed

N. Gokon, S. Yokota, H. S. Cho, T. Hatamachi, T. Kodama

ISES Solar World Congress 2015, Conference Proceedings 806 - 815 2015

4-2-3 Thermochemical Two-Step Water-splitting cycle by 45kW_<th>KIER solar furnace (2) Solar Test of Conical type CeO_2/MPSZ Device

TSUCHIDA Satoshi, CHO Hyun-Seok, GOKON Nobuyuki, KODAMA Tatsuya, KANG Yong-Heack

Proceedings of the Annual Conference of The Japan Institute of Energy 24 176 - 177 2015

Language：Japanese Publisher：The Japan Institute of Energy

We have developed reactive foam devices in Niigata University for solar thermochemical two-step water-splitting to produce hydrogen from water. The hydrogen productivity of the reactive foam devices was cyclically examined as an international collaboration research by using 45kW_<th> dish type solar concentrator in Korea Institute of Energy Research at Korea. Different shape of foam devices and radiation method of solar furnace were tested for solar demonstration.

DOI： 10.20550/jietaikaiyoushi.24.0_176

4-2-2 High Activation of Redox Material Based on Metal Oxide for Thermochemical Two-Step Water-Splitting cycle

SUDA Toshinori, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 24 174 - 175 2015

Language：Japanese Publisher：The Japan Institute of Energy

Cerium oxide was examined as a redox material on cyclic reactivity for converting high-temperature heat into chemical fuels via solar two-step thermochemical water-splitting. In this study, in order to increase hydrogen and oxygen production in comparison to pure CeO_2, we synthesized a doping of 30mol% metal ion to the CeO_2 (30mol%M-CeO_<2-δ>), and tested the 30mol%M-CeO_<2-δ> powder for thermochemical two-step water-splitting to produce hydrogen and oxygen during cyclic reaction. The reactivity of the M-CeO_<2-δ> powder was evaluated for several cycles.

DOI： 10.20550/jietaikaiyoushi.24.0_174

Steam gasification of coal cokes in an internally circulating fluidized bed of thermal storage material for solar thermochemical processes Reviewed

Nobuyuki Gokon, Takuya Izawa, Takehiko Abe, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 39 ( 21 ) 11082 - 11093 2014.7

Steam reforming of methane using double-walled reformer tubes containing high-temperature thermal storage Na2CO3/MgO composites for solar fuel production Reviewed

Nobuyuki Gokon, Shohei Nakamura, Tsuyoshi Hatamachi, Tatsuya Kodama

ENERGY 68 773 - 782 2014.4

Solar flux distribution of new beam-down solar concentrating system at Miyazaki for solar thermochemical processes Reviewed

Shunta Tokunaga, Naoya Watanabe, Kei Omori, Tatsuya Kodama, Nobuyuki Gokon, Shoji Koikari, KazuoYoshida, Yoshinori Nagase, Katsushige Nakamura

International Symposium on Fusion Tech 2013 at Korea, Seoul, Korea, January 15-17, 2014. 2014

Solar Hydrogen Production Via Thermochemical Two-Step Water Splitting Cycle Using CeO?/MPSZ Ceramic Foam device by KIER Solar Furnace Reviewed

Takuya Myojin, Shintaro Kawakami, Hyun Seok Cho, Nobuyuki Gokon, Tatsuya Kodama, Yong Heack Kang, Sang Nam Lee, Khwan Kyo Chai, Hwan Ki Yoon, Hyun Jim Lee

International Symposium on Fusion Tech 2013 at Korea, Seoul, Korea, January 15-17, 2014. 2014

Development of Solar Fluidized Bed Reactor For Hydrogen Production Via Thermochemical Two‐Step Water Splitting Reviewed

Naoya Watanabe, Shunta Tokunaga, Kei Omori, Tsuyoshi Hatamachi, Nobuyuki Gokon, Tatsuya Kodama

Grand Renewable Energy 2014 International Conference and Exhibition together with international solar energy society asia pacific conference 2014 and the 2nd asia wave and tidal energy conference, Tokyo Big Sight, Tokyo, Japan, July 27-August 1, 2014. 2014

Thermochemical Gasification of Coal Cokes Using Fluidized Bed Reactor for Solar−Hybrid Fuel Production Reviewed

Nobuyuki Gokon, Takehiko Abe, Takuya Izawa, Chiaki Kogure, Tatsuya Kodama

CPC performances with a novel 100-kW beam-down solar concentrating system at Miyazaki for demonstration of thermochemical water-splitting reactor Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Koji Matsubara, Kazuo Yoshida, Souji Koikari, Hiroshi Kaneko, Katsusige Nakamura

SolarPACES 2014, Beijing, China, September 16-19, 2014. 2014

DEVELOPMENT OF METAL-DOPED CERIA AIMED AT LOWER TEMPERATURE OF THERMAL REDUCTION STEP OF THERMOCHEMICAL TWO-STEP WATER-SPLITTING CYCLE FOR SOLAR HYDROGEN PRODUCTION Reviewed

Toshinori Suda, Nobuyuki Gokon, Tatsuya Kodama

AFORE 2014, Yeosu, Korea, November 17-20, 2014. 2014

FLUIDIZED BED REACTOR FOR SOLAR THERMOCHEMICAL TWO-STEP WATER-SPLITTING CYCLE Reviewed

Akane Takeuchi, Tetsuro Etori, Shinosuke Yokota, Sumie Ito, Nobuyuki Gokon, Tatsuya Kodama

AFORE 2014, Yeosu, Korea, November 17-20, 2014. 2014

SOLAR THERMOCHEMICAL TWO-STEP WATER-SPLITTING USING CEO2 COATED FOAM DEVICE FOR HYDROGEN PRODUCTION Reviewed

Satoshi Tsuchida, Hyun Seok Cho, Shintaro Kawakami, Takuya Myojin, Nobuyuki Gokon, Tatsuya Kodama

AFORE 2014, Yeosu, Korea, November 17-20, 2014. 2014

Thermochemical two-step water splitting cycle using Ni-ferrite and CeO2 coated ceramic foam devices by concentrated Xe-light radiation Reviewed

S. Kawakami, T. Myojin, H. -S. Cho, T. Hatamachi, N. Gokon, T. Kodama

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE 49 1980 - 1989 2014

Flux measurement of a new beam-down solar concentrating system in Miyazaki for demonstration of thermochemical water splitting reactors Reviewed

T. Kodama, N. Gokon, K. Matsubara, K. Yoshida, S. Koikari, Y. Nagase, K. Nakamura

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE 49 1990 - 1998 2014

Solar demonstration of thermochemical two-step water splitting cycle using CeO2/MPSZ ceramic foam device by 45kW(th) KIER solar furnace Reviewed

H. S. Cho, T. Myojin, S. Kawakami, N. Gokon, T. Kodama, Y. H. Kang, S. N. Lee, K. K. Chai, H. K. Yoon, H. J. Lee

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE 49 1922 - 1931 2014

High-temperature fluidized receiver for concentrated solar radiation by a beam-down reflector system Reviewed

K. Matsubara, Y. Kazuma, A. Sakurai, S. Suzuki, L. Soon-Jae, T. Kodama, N. Gokon, C. Hyun Seok, K. Yoshida

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE 49 447 - 456 2014

Carbonate molten-salt absorber/reformer: heating and steam reforming performance of reactor tubes Reviewed

N. Gokon, S. Nakamura, K. Matsubara, T. Kodama

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE 49 1940 - 1949 2014

Kinetics of thermal reduction step of thermochemical two-step water splitting using CeO2 particles: Master-plot method for analyzing non-isothermal experiments Reviewed

T. Ishida, N. Gokon, T. Hatamachi, T. Kodama

PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE 49 1970 - 1979 2014

Comparative study of activity of cerium oxide at thermal reduction temperatures of 1300-1550 degrees C for solar thermochemical two-step water-splitting cycle Reviewed

Nobuyuki Gokon, Sachi Sagawa, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 38 ( 34 ) 14402 - 14414 2013.11

Oxygen-releasing step of nickel ferrite based on Rietveld analysis for thermochemical two-step water-splitting Reviewed

Nobuyuki Gokon, Ken Kondo, Tsuyoshi Hatamachi, Mineo Sato, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 38 ( 12 ) 4935 - 4944 2013.4

4-4-2 Study on Thermochemical Two-Step Water-Splitting cycle using cerium oxidation for high activation

SAGAWA Sachi, ONO Akihiro, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 22 178 - 179 2013

Language：Japanese Publisher：The Japan Institute of Energy

Cerium oxide was examined as a redox material on cyclic reactivity for converting high-temperature heat into chemical fuels via solar two-step thermochemical water-splitting. In this study, the thermal reduction of metal-doped cerium particles was examined at 1500℃, and the subsequent water-decomposition step was performed at 800-1150℃. The oxygen and hydrogen productivity were measured at each step, and the stoichiometry was evaluated.

DOI： 10.20550/jietaikaiyoushi.22.0_178

4-4-3 Kinetic analysis of thermal reduction of Two-Step Water-Splitting cycle using CeO_2

SATO Yusuke, ISHIDA Tomoya, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 22 180 - 181 2013

Language：Japanese Publisher：The Japan Institute of Energy

Cerium oxide was examined as a redox material on cyclic reactivity for converting high-temperature heat into chemical fuels via solar two-step thermochemical water-splitting. The thermal reduction of the cerium particles was conducted at 1000-1500℃, and oxygen production rate were measured. The kinetics of oxygen production for thermal reduction step was analyzed, then Arrhenius parameter and reaction model equation were evaluated.

DOI： 10.20550/jietaikaiyoushi.22.0_180

4-4-5 Solar Demonstration of thermochemical two-step water splitting cycle using CeO_2/MPSZ ceramic form device by 45kW_<th> KIER solar furnace

CHO Hyun Seok, KAWAKAMI Shintaro, MYOJIN Takuya, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya, KANG Yong Heack

Proceedings of the Annual Conference of The Japan Institute of Energy 22 184 - 185 2013

Language：Japanese Publisher：The Japan Institute of Energy

Joint international project of Niigata University (Japan) -Korean Institute of Energy Research, KIER (Kora) on the "Solar demonstration of Water-Splitting Reactor using Ceramic Foam Device" aims to develop a novel-type of solar reactor with reactive cerium- or iron oxides-coated foam devices for high-temperature two-step thermochemical water splitting cycle, and to demonstrate its performances on sun with a 40-kW_<th> solar furnace. The reactive CeO_2 foam device for the two-step water splitting is proposed and prepared by Niigata University, Japan, and involves coating an inert zirconia foam with reactive CeO_2 or ferrite-zirconia redox materials. The project includes the development of reactive foam devices, the new design and the fabrication of solar reactor with the reactive foam devices, and finally the solar demonstration on the KIER's 45-kW_<th> solar furnace in Korea. In this paper, highly-active CeO_2 particles were used as a redox material for preparing CeO_2 foam devices. A ceramic foam disk made of MgO partially-stabilized Zirconia (MPSZ) was used as a ceramic matrix that was coated with the CeO_2 particles. Solar thermochemical two-step water splitting was demonstrated using the prepared CeO_2-coated MPSZ (CeO_2/MPSZ) foam devices in Korea.

DOI： 10.20550/jietaikaiyoushi.22.0_184

4-4-4 Two-step thermochemical water splitting reaction of CeO_2 by internally-circulating fluidized

OMORI Kei, TOKUNAGA Shunta, WATANABE Naoya, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 22 182 - 183 2013

Language：Japanese Publisher：The Japan Institute of Energy

Thermochemical two-step water-splitting cycle, which utilizes concentrated solar radiation as a energy source and uses steam as a chemical source, is a one of the most promising hydrogen productions from water, We are developing 2 types of windowed solar chemical reactors with internally-circulating fluidized bed of cerium oxide particles for hydrogen production via thermochemical two-step water-splitting. In the present work, the performance of each solar reactor with the internally circulating fluidized beds was examined for two-step water splitting of thermal reduction and water-decomposition using their particles under 5kW_<th> sun-simulator.

DOI： 10.20550/jietaikaiyoushi.22.0_182

CO2 gasification of coal cokes using internally circulating fluidized bed reactor by concentrated Xe-light irradiation for solar gasification Reviewed

Nobuyuki Gokon, Ryuta Ono, Tsuyoshi Hatamachi, Li Liuyun, Hee-Joon Kim, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 37 ( 17 ) 12128 - 12137 2012.9

The basic study about reforming biomass-tar using catalysts for solar energy biomass gasfication Reviewed

Liuyun Li, Gokon Nobuyuki, Kodama Tatsuya, Tadaaki Shimizu, Hee Joon Kim

SolarPACES 2012, Marrakech, Morocco, September 11-14, 2012. 2012

Heat Transfer characteristics of internally circulating fluidized bed solar reactor Reviewed

Atsushi Sakurai, So Sakuma, Gokon Nobuyuki, Koji Matsubara, Kodama Tatsuya

SolarPACES 2012, Marrakech, Morocco, September 11-14, 2012. 2012

COMPARISON STUDIES OF REACTIVITY ON NICKEL-FERRITE AND CERIUM-OXIDE REDOX MATERIALS FOR TWO-STEP THERMOCHEMICAL WATER SPLITTING BELOW 1400 degrees C Reviewed

Tatsuya Kodama, Nobuki Imaizumi, Nobuyuki Gokon, Tsuyoshi Hatamachi, Daiki Aoyagi, Ken Kondo

PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY 2011, PTS A-C 1617 - 1623 2012

Steam gasification of coal cokes using fluidized bed reactor for solar thermochemical conversion Reviewed

Nobuyuki Gokon, Ryuta Ono, Kei Omori, Tsuyoshi Hatamachi, Li Liuyun, Hee Joon Kim, Tatsuya Kodama

SolarPACES 2012, Marrakech, Morocco, September 11-14, 2012. 2012

Two-step switching test of water-splitting process using internally-circulating fluidized bed reactor Reviewed

Kei Omori, Nobuyuki Gokon, Tsuyoshi Hatamachi, Tatsuya Kodama

SolarPACES 2012, Marrakech, Morocco, September 11-14, 2012. 2012

Solar Demonstration Project on a Novel Fluidized Bed Reactor for “Single-processed” Thermochemical Water-splitting Cycle with a Beam-Down Concentrating System at Miyazaki Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Kei Omori, Yoshinori Nagase, Katsushige Nakamura

SolarPACES 2012, Marrakech, Morocco, September 11-14, 2012. 2012

4-5-1 Development of Ni/MgO-Al_2O_3 catalyst foam device for use as a solar reformer

SHIMAWAKI Kazunori, NAKAMURA Shohei, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 21 230 - 231 2012

Language：Japanese Publisher：The Japan Institute of Energy

Catalytically-activated ceramic foam device has been developed as a solar receiver/absorber for use in methane reforming under concentrated solar radiation as an energy source. Ni/MgO-Al_2O_3 catalysts were loaded on the SiC ceramic foam. Catalytic activity and kinetics for methane reforming were studied using Ni/MgO-Al_2O_3/SiC foam device under Xe-light irradiation and electric furnace, respectively.

DOI： 10.20550/jietaikaiyoushi.21.0_230

4-5-2 Studies of Na2CO3/MgO molten salt solar receiver reactor tube

TAKAHASHI Shogo, KURITA Shinji, HATAMACHI Tsuyoshi, SAKURAI Atsushi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 21 232 - 233 2012

Language：Japanese Publisher：The Japan Institute of Energy

Double-walled reactor tubes with molten-salt thermal storage were developed for solar air receiver to generate electricity and for solar reforming to produce solar fuel. A mixture of Na_2CO_3 and MgO was loaded as a thermal storage medium into the outer annulus of that. Performances of the reactor tubes were studied as an air receiver and as a reformer tube in the present study.

DOI： 10.20550/jietaikaiyoushi.21.0_232

4-4-3 Thermochemical water-splitting by reactive foam devices

SATO Naoki, KAWAKAMI Shintaro, MYOUJIN Takuya, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya, SEO Taebeom

Proceedings of the Annual Conference of The Japan Institute of Energy 21 226 - 227 2012

Language：Japanese Publisher：The Japan Institute of Energy

We have developed reactive foam devices for solar thermochemical two-step water-splitting to produce hydrogen from water. We have researched the hydrogen production activity of the reactive foam devices by 3kW sun-simulator in Niigata University and by 5kW dish type solar concentrator in Inha University in Korea. Solar hydrogen productions were cyclically demonstrated for nine cycles at solar irradiation test at Korea.

DOI： 10.20550/jietaikaiyoushi.21.0_226

A Study of Themal Design for the Development of High-efficiency Fluidized Bed Solar Reactor

So Sakuma, Atsushi Sakurai, Kyohei Ogino, Seung-Jae Lee, Koji Matsubara, Nobuyuki Gokon, Tatsuya Kodama

Proceedings of the 8th international conference on flow dynamics 562 - 563 2011.11

Numerical Visualization of Radiative Heat Flux of Dispersed Particles Irradiated by Solar Light

S. Sakuma, A. Sakurai, K. Matsubara, N. Gokon, T. Kodama

Proceedings of the 11th Asian Symposium on Visualization (ASV11) ASV11-po-33 2011.6

Thermochemical two-step water splitting by internally circulating fluidized bed of NiFe2O4 particles: Successive reaction of thermal-reduction and water-decomposition steps Reviewed

Nobuyuki Gokon, Tetsuro Mataga, Nobuyuki Kondo, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 36 ( 8 ) 4757 - 4767 2011.4

Ferrite/zirconia-coated foam device prepared by spin coating for solar demonstration of thermochemical water-splitting Reviewed

Nobuyuki Gokon, Tatsuya Kodama, Nobuki Imaizumi, Jun Umeda, Taebeom Seo

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 36 ( 3 ) 2014 - 2028 2011.2

Kinetics of methane reforming over Ru/gamma-Al2O3-catalyzed metallic foam at 650-900 degrees C for solar receiver-absorbers Reviewed

Nobuyuki Gokon, Yuhei Yamawaki, Daisuke Nakazawa, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 36 ( 1 ) 203 - 215 2011.1

Water-Splitting Foam Device Reactor for Solar Thermochemical Hydrogen Production Reviewed

Naoki Sato, Nobuki Imaizumi, Masanori Sugisaki, Tsuyoshi Hatamachi, Seo Taebeom, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2011 at Dalian, Dalian, China, December 15-17, 2011. 2011

HIGH-TEMPERATURE SOLAR THERMOCHEMICAL HYDROGEN PRODUCTION Reviewed

Tatsuya Kodama, Tetsuro Mataga, Kei Oomori, Tsuyoshi Hatamachi, Nobuyuki Gokon

International Symposium on Fusion Tech 2011 at Dalian, Dalian, China, December 15-17, 2011. 2011

3kWth Internally circulating fluidized bed reactor for solar gasification of coal cokes Reviewed

Nobuyuki Gokon, Ryuta Ono, Tsuyoshi Hatamachi, Li Liuyun, Hee Joon Kim, Atsushi Sakurai, Koji Matsubara, Tatsuya Kodama

SolarPACES 2011, Granada, Spain, 20-23 September, 2011. 2011

Continuous hydrogen production by an internally-curcurating fluidized particle bed reactor for thermochemical water splitting Reviewed

Tatsuya Kodama, Tetsuro Mataga, Nobuki Imaizumi, Tsuyoshi Hatamachi, Nobuyuki Gokon

SolarPACES 2011, Granada, Spain, 20-23 September, 2011. 2011

Activity test of a ferrite foam device reactor for solar thermochemical two-step water-splitting Reviewed

Nobuki Imaizumi, Naoki Sato, Tsuyoshi Hatamachi, Taebeom Seo, Nobuyuki Gokon, Tatsuya Kodama

SolarPACES 2011, Granada, Spain, 20-23 September, 2011. 2011

FUNDAMENTAL STUDY OF RADIATIVE TRANSFER ANALYSIS OF INTERNALLY CIRCULATING FLUIDIZED BED SOLAR REACTOR Reviewed

Atsushi Sakurai, So Sakuma, Nobuyuki Gokon, Koji Matsubara, Tatsuya Kodama

SolarPACES 2011, Granada, Spain, 20-23 September, 2011. 2011

Solar Thermochemical Two Step Water-Splitting by Beam Down Solar Concentrating System Reviewed

Kei Omori, Tetsuro Mataga, Megumi Saito, Tsuyoshi Hatamachi, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2011 at Dalian, Dalian, China, December 15-17, 2011. 2011

4-2-2 Two-Step Thermochemical Water-Splitting cycle using cerium oxide

AOYAGI Daiki, KAKENO Ayaka, IMAIZUMI Nobuki, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 20 216 - 217 2011

Language：Japanese Publisher：The Japan Institute of Energy

Cerium oxide was examined as a redox material on cyclic reactivity for converting high-temperature heat into chemical fuels via solar two-step thermochemical water-splitting. The thermal reduction of the cerium particles was conducted at 1300-1550℃, and the subsequent water-decomposition step was performed at 1000℃. The oxygen and hydrogen productivity were measured at each step, and the stoichiometry was evaluated.

DOI： 10.20550/jietaikaiyoushi.20.0_216

4-2-3 Single-step systemization of thermochemical two-step water splitting cycle using an internally-circulating fluidized bed reactor

MATAGA Tetsuro, ITO Hiroto, HOSHINO Manami, IMAIZUMI Nobuki, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 20 218 - 219 2011

Language：Japanese Publisher：The Japan Institute of Energy

A windowed solar chemical reactor with an internally-circulating fluidized bed of metal oxides particles has been developed for realizing hydrogen production from water via the thermochemical two-step water-splitting cycle. In this research, the authors tried to systemize the two-step water-splitting processes into single-step in an internally-circulating fluidized bed reactor. The single-step systemized reactor using the internally-circulating fluidized bed of reacting particles was tested by solar-simulated Xe light irradiation and evaluated on hydrogen productivity.

DOI： 10.20550/jietaikaiyoushi.20.0_218

4-2-1 Rietveld analysis of reactive ceramics for two-step thermochemical water-splitting

KONDO Ken, TANAKA Yoshiki, SATO Yusuke, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 20 214 - 215 2011

Language：Japanese Publisher：The Japan Institute of Energy

Reactive ceramics of m-ZrO_2-supported NiFe_2O_4 and unsupported NiFe_2O_4 were analyzed by Rietveld method for enhancing hydrogen productivity for solar thermochemical two-step water-splitting. In this paper, the reduced phase (wustite phase) and the remaining ferrite phase obtained after that their reactive ceramics were thermally reduced at 1300-1400℃ was examined, and the composition and the existence ratio of them were determined. The relation between the reduction temperature and the reaction activity was discussed.

DOI： 10.20550/jietaikaiyoushi.20.0_214

2D axisymmetrical radiative transfer simulation of dispersed particles by spherical harmonics method

Sakurai Atsushi, Sakuma So, Matsubara Koji, Gokon Nobuyuki, Kodama Tatsuya

Proceedings of National Heat Transfer Symposium 2011 343 - 343 2011

Coal Coke Gasification in a Windowed Solar Chemical Reactor for Beam-Down Optics Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Shu-ich Enomoto, Shouta Itoh, Tsuyoshi Hatamachi

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 132 ( 4 ) 041004-6 - 041004-6 2010.11

Comparative study of the activity of nickel ferrites for solar hydrogen production by two-step thermochemical cycles Reviewed

Fernando Fresno, Tomoaki Yoshida, Nobuyuki Gokon, Rocio Fernandez-Saavedra, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 35 ( 16 ) 8503 - 8510 2010.8

Ni/MgO-Al2O3 and Ni-Mg-O catalyzed SiC foam absorbers for high temperature solar reforming of methane Reviewed

Nobuyuki Gokon, Yuhei Yamawaki, Daisuke Nakazawa, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 35 ( 14 ) 7441 - 7453 2010.7

Internally Circulating Fluidized Bed Reactor Using m-ZrO2 Supported NiFe2O4 Particles for Thermochemical Two-Step Water Splitting Reviewed

Nobuyuki Gokon, Hiroki Yamamoto, Nobuyuki Kondo, Tatsuya Kodama

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 132 ( 2 ) 021102-1 - 021102-10 2010.5

Two-Step Thermochemical Cycles for High-Temperature Solar Hydrogen Production Reviewed

Tatsuya Kodama, Nobuyuki Gokon

Advances in Science and Technology 72 119 - 128 2010

5kWth-solar demonstration of a ferrite foam device reactor for thermochemical two-step water-splitting Reviewed

Tatsuya Kodama, Taebeom Seo, Nobuyuki Gokon, Ju Han Lee, Sang Joon Oh, Koichi Sakai, Nobuki Imaizumi

SolarPACES2010, Perpinan, France, September 21-25 2010. 2010

MOLTEN-SALT TUBULAR ABSORBER/REFORMER (MoSTAR) PROJECT: REFORMING PERFORMANCE OF REACTOR TUBES DURING INTERMITTENT HEATING Reviewed

Nobuyuki Gokon, Tatsuya Kodama, Shingo Yamashita, Tsuyoshi Hatamachi, Taebeom Seo

ES2010: PROCEEDINGS OF ASME 4TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, VOL 2 105 - 113 2010

Molten-salt tubular absorber/reformer (MoSTAR) project: NaCl/MgO composite thermal storage for double-walled reactor tubes Reviewed

Nobuyuki Gokon, Shingo Yamashita, Shogo Takahashi, Tatsuya Kodama, Taebeom Seo

SolarPACES2010, Perpinan, France, September 21-25 2010. 2010

4-2-3 Thermochemical two-step water-splitting using ferrite-coated foam devices by 5 kW dish type solar concentrator

IMAIZUMI Nobuki, SATO Naoki, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya, SEO Taebeom

Proceedings of the Annual Conference of The Japan Institute of Energy 19 232 - 233 2010

Language：Japanese Publisher：The Japan Institute of Energy

We have developed ferrite-coated foam devices for solar thermochemical two-step water-splitting to produce hydrogen from water. The reactivity of the foam device was firstly tested by 1 kW solar simulator at a laboratory scale experiment. Hydrogen was continuously produced for 20 cycles. Then, the foam device was tested by 5 kW dish type solar concentrator in Inha University in Korea. As a result, solar hydrogen production was demonstrated for several cycles.

DOI： 10.20550/jietaikaiyoushi.19.0_232

4-2-2 Reactivity of reactive ceramic for solar hydrogen production by Two-Step Thermochemical Water-Splitting

AOYAGI Daiki, KAKENO Ayaka, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 19 230 - 231 2010

Language：Japanese Publisher：The Japan Institute of Energy

Reactive ceramic was studied as a redox material for converting high-temperature heat into chemical fuels via solar two-step thermochemical water-splitting. In the present study, cyclic reactivity of reactive ceramic such as, Fe-containing YSZ particles was examined using thermal reduction temperatures of 1400-1500°C.

DOI： 10.20550/jietaikaiyoushi.19.0_230

4-2-4 Ni-based catalyst foam device for use as a receiver/absorber in a windowed solar reformer

YAMAWAKI Yuhei, SHIMAWAKI Kazunori, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 19 234 - 235 2010

Language：Japanese Publisher：The Japan Institute of Energy

Catalytically-activated ceramic foam device has been developed as a solar receiver/absorber for use in methane reforming under concentrated solar radiation as an energy source. Ni-Mg-O and Ni/MgO-Al_2O_3 catalysts were loaded on the SiC ceramic foam. They were examined on activity in CO_2 reforming of methane under solar -simulated Xe light radiation by a windowed reformer.

DOI： 10.20550/jietaikaiyoushi.19.0_234

Molten-Salt Tubular Absorber/Reformer (MoSTAR) Project: The Thermal Storage Media of Na2CO3-MgO Composite Materials Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Shin-ichi Inuta, Shingo Yamashita, Taebeom Seo

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 131 ( 4 ) 041013-1 - 041013-8 2009.11

Double-walled reformer tubes using high-temperature thermal storage of molten-salt/MgO composite for solar cavity-type reformer Reviewed

Nobuyuki Gokon, Shin-ichi Inuta, Shingo Yamashita, Tsuyoshi Hatamachi, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 34 ( 17 ) 7143 - 7154 2009.9

Thermochemical two-step water splitting cycles by monoclinic ZrO2-supported NiFe2O4 and Fe3O4 powders and ceramic foam devices Reviewed

Nobuyuki Gokon, Hiroko Murayama, Ayumi Nagasaki, Tatsuya Kodama

SOLAR ENERGY 83 ( 4 ) 527 - 537 2009.4

New Solar Water-Splitting Reactor With Ferrite Particles in an Internally Circulating Fluidized Bed Reviewed

Nobuyuki Gokon, Shingo Takahashi, Hiroki Yamamoto, Tatsuya Kodama

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 131 ( 1 ) 2009.2

Monoclinic zirconia-supported Fe3O4 for the two-step water-splitting thermochemical cycle at high thermal reduction temperatures of 1400-1600 degrees C Reviewed

Nobuyuki Gokon, Hiroko Murayama, Jun Umeda, Tsuyoshi Hatamachi, Tatsuya Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 34 ( 3 ) 1208 - 1217 2009.2

Kinetics of CO2 reforming of methane by catalytically activated metallic foam absorber for solar receiver-reactors Reviewed

Nobuyuki Gokon, Yusuke Osawa, Daisuke Nakazawa, Tatsuya Kodma

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 34 ( 4 ) 1787 - 1800 2009.2

CO2 reforming of CH4 using molten salt/MgO composite thermal storages for solar hydrogen production Reviewed

Nobuyuki Gokon, Shin-ichi Inuta, Shingo Yamashita, Tsuyoshi Hatamachi, Tatsuya Kodama

International Symposium on Fusion Tech 2009 at Incheon, Incheon, Korea, January 13-15, 2009 2009

KINETICS OF CO(2) REFORMING OF METHANE BY CATALYTICALLY ACTIVATED METALLIC FOAM ABSORBER FOR SOLAR RECEIVER-REACTORS Reviewed

Nobuyuki Gokon, Yusuke Osawa, Daisuke Nakazawa, Tsuyoshi Hatarnachi, Tatsuya Kodama

ES2008: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, VOL 2 371 - 383 2009

REACTIVITY OF IRON-CONTAINING YSZ FOR A TWO-STEP THERMOCHEMICAL WATER SPLITTING USING THERMAL REDUCTION TEMPERATURES OF 1400-1500 degrees C Reviewed

Tatsuya Kodama, Eiji Hiraiwa, Nobuyuki Gokon

ES2008: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, VOL 2 361 - 369 2009

Internally circulating fluidized bed reactor with NiFe2O4 particles for thermochemical water-splitting Reviewed

Nobuyuki Gokon, Nobuyuki Kondo, Tetsuro Mataga, Tatsuya Kodama

SolarPACES2009, Berlin, Germany, September 15-18 2009. 2009

KINETICS OF CO(2) REFORMING OF METHANE BY CATALYTICALLY ACTIVATED METALLIC FOAM ABSORBER FOR SOLAR RECEIVER-REACTORS Reviewed

Nobuyuki Gokon, Yusuke Osawa, Daisuke Nakazawa, Tsuyoshi Hatarnachi, Tatsuya Kodama

ES2008: PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, VOL 2 34 ( 4 ) 371 - 383 2009

Thermochemical Two-Step Water Splitting by Zirconia-Supported Ferrites and Its foam Device for Solar Demonstration Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Juyn Umeda, Kouchi Sakai, Taebeom Seo

SolarPACES2009, Berlin, Germany, September 15-18 2009. 2009

Reactive ferrite-coated ceramic foam device for a solar thermochemical hydrogen production Reviewed

Ayumi Nagasaki, Tsuyoshi Hatamachi, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2009 at Incheon, Incheon, Korea, January 13-15, 2009 2009

Solar thermochemical hydrogen production research in Inha and Niigata Universities collaboration Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Ayumi Nagasaki, Taebeom Seo

International Symposium on Fusion Tech 2009 at Incheon, Incheon, Korea, January 13-15, 2009 2009

FERRITE-LOADED CERAMIC FOAM DEVICES PREPARED BY SPIN-COATING METHOD FOR A SOLAR TWO-STEP THERMOCHEMICAL CYCLE Reviewed

Nobuyuki Gokon, Tatsuya Kodama, Ayumi Nagasaki, Ko-ichi Sakai, Tsuyoshi Hatamachi

ES2009: PROCEEDINGS OF THE ASME 3RD INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, VOL 2 439 - 449 2009

MOLTEN-SALT TUBULAR ABSORBER/REFORMER (MoSTAR) PROJECT: METAL-PLATE-BRIDGED DOUBLE TUBE REACTOR Reviewed

Tatsuya Kodama, Nobuyuki Gokon, Shin-ichi Inuta, Shin-go Yamashita, Tsuyoshi Hatamachi, Taebeom Seo

ES2009: PROCEEDINGS OF THE ASME 3RD INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, VOL 2 451 - 457 2009

4-10-4 Internally-circulating fluidized bed of ferrite particles for thermochemical two-step water splitting by solar irradiation

KONDO Nobuyuki, MATAGA Tetsuro, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 18 312 - 313 2009

Language：Japanese Publisher：The Japan Institute of Energy

A windowed solar chemical reactor with internally-circulating fluidized bed of ferrite particles has been developed for realizing hydrogen production from water via the thermochemical cycle. In this research, unsupported NiFe_2O_4 and m-ZrO_2 supported NiFe_2O_4 were tested for successive two-step water-splitting using the internally-circulating fluidized bed reactor by solar-simulated Xe light irradiation.

DOI： 10.20550/jietaikaiyoushi.18.0_312

4-10-1 Solar CO_2 reforming of methane by catalytically sctivated foam devices

NAKAZAWA Daisuke, YAMAWAKI Yuhei, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 18 306 - 307 2009

Language：Japanese Publisher：The Japan Institute of Energy

Catalytically-activated metallic foam device has been developed for methane reforming under direct solar radiation. Ru/γ-Al_2O_3 catalyst was loaded on the metallic foam, and was tested on activity in CO_2 reforming of methane under solar-simulated Xe light irradiation by volumetric reactor. Kinetics of methane reforming with CO_2 was also examined using the foam devices in the temperature range of 750-850℃ by uniform heating using electric furnace.

DOI： 10.20550/jietaikaiyoushi.18.0_306

4-9-4 Thermochemical Two-Step Water-Splitting Cycle by ferrite supported on zirconia

UMEDA Jun, KONDO Ken, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 18 304 - 305 2009

Language：Japanese Publisher：The Japan Institute of Energy

Two-step thermochemical water-splitting cycle were examined on activity and reactivity for NiFe_2O_4/m-ZrO_2 and NiFe_2O_4/c-YSZ using thermal reduction temperatures of 1400-1500℃ for the purpose of converting solar-high temperature heat into hydrogen. In addition, reaction mechanism of two-step water splitting was evaluated for NiFe_2O_4/m-ZrO_2 and NiFe_2O_4/c-YSZ using XRD analysis and chemical analysis.

DOI： 10.20550/jietaikaiyoushi.18.0_304

4-10-2 Studies of tubular reformers with Na_2CO_3/MgO composite thermal storage for solar CO_2 reforming of methane

YAMASHITA Shingo, MORI Shusaku, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 18 308 - 309 2009

Language：Japanese Publisher：The Japan Institute of Energy

A solar reformer of the "double-walled" reactor tubes with molten-salt has been developed for carbon dioxide reforming of methane using high-temperature solar heat. Ru/Al_2O_3 catalyst particles were loaded in the inner tube of the double-walled tubular reactor while a mixture of Na_2CO_3 and MgO was loaded as a thermal storage medium into the outer annulus of that. In the present work, variation of insolation due to cloud passage was simulated by intermittent heating, and reforming performances of the reformer tubes were examined.

DOI： 10.20550/jietaikaiyoushi.18.0_308

Water Splitting by Using a Metal Oxide for Solar Thermal/Chemical Energy Conversion Reviewed

Occurrence of Faceting for [110] Symmetric Tilt Boundaries in Cu Doped with Bi Reviewed

Nobuyuki Gokon, Masanori Kajihara

MATERIALS TRANSACTIONS 49 ( 11 ) 2584 - 2590 2008.11

Thermochemical two-step water-splitting for hydrogen production using Fe-YSZ particles and a ceramic foam device Reviewed

Nobuyuki Gokon, Tomoki Hasegawa, Shingo Takahashi, Tatsuya Kodama

ENERGY 33 ( 9 ) 1407 - 1416 2008.9

Fracture behavior of Sigma 9 [110] asymmetric tilt boundaries in Cu doped with Bi Reviewed

N. Gokon, S. Ohyama, M. Kajihara

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 488 ( 1-2 ) 252 - 259 2008.8

Development of novel magnetic nano-carriers for high-performance affinity purification Reviewed

Kosuke Nishio, Yuka Masaike, Morihito Ikeda, Hiroki Narimatsu, Nobuyuki Gokon, Shingo Tsubouchi, Mamoru Hatakeyama, Satoshi Sakamoto, Naohiro Hanyu, Adarsh Sandhu, Haruma Kawaguchi, Masanori Abe, Hiroshi Handa

COLLOIDS AND SURFACES B-BIOINTERFACES 64 ( 2 ) 162 - 169 2008.7

Thermochemical two-step water-splitting reactor with internally circulating fluidized bed for thermal reduction of ferrite particles Reviewed

N. Gokon, S. Takahashi, H. Yamamoto, T. Kodama

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 33 ( 9 ) 2189 - 2199 2008.5

Experimental determination of boundary energies of Sigma 9 [110] asymmetric tilt boundaries in Cu Reviewed

N. Gokon, A. Kajihara

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 477 ( 1-2 ) 121 - 128 2008.3

Application of an internally circulating fluidized bed for windowed solar chemical reactor with direct irradiation of reacting particles Reviewed

Tatsuya Kodama, Syu-ichi Enomoto, Tsuyoshi Hatamachi, Nobuyuki Gokon

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 130 ( 1 ) 014504-1 - 014504-4 2008.2

Iron-containing yttria-stabilized zirconia system for two-step thermochemical water splitting Reviewed

Nobuyuki Gokon, Takayuki Minno, Yumiko Nakamuro, Tatsuya Kodama

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 130 ( 1 ) 011018-1 - 011018-6 2008.2

Coal Coke gasification in a windowed solar chemical reactor for beam-down optics Reviewed

Tatsuya Kodama, Shu-ich Enomoto, Shouta Itoh, Tsuyoshi Hatamachi, Nobuyuki Gokon

14th Biennial CSP SolarPACES Symposium, LasVegas, Nevada, USA, March 4-7, 2008 2008

Two-Step Water Splitting By Fe3O4 on Monoclinic Zirconia Support Using Thermal Reduction Temperatures of 1400-1600?C Reviewed

Nobuyuki Gokon, Hiroko Murayama, Eiji Hiraiwa, Jun Umeda, Tsuyoshi Hatamachi, Tatsuya Kodama

14th Biennial CSP SolarPACES Symposium, LasVegas, Nevada, USA, March 4-7, 2008 2008

High-temperature carbonate/MgO composite materials as thermal storage media for double-walled solar reformer tubes Reviewed

N. Gokon, D. Nakano, S. Inuta, T. Kodama

SOLAR ENERGY 82 ( 12 ) 1145 - 1153 2008

Thermochemical two-step water splitting by ZrO2-supported NixFe3-xO4 for solar hydrogen production Reviewed

T. Kodama, N. Gokon, R. Yamamoto

SOLAR ENERGY 82 ( 1 ) 73 - 79 2008

4-7 Internally-circulating fluidized bed reactor with Ni-ferrte/m-ZrO_2 particle for solar thermochemical water-splitting

YAMAMOTO Hiroki, KONDOU Nobuyuki, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 17 208 - 209 2008

4-9 Studies of tubular reformers with molten salt thermal storage for solar CO_2 reforming of methane

INUTA Shinichi, YAMASHITA Shingo, HARA Yoshinori, HATAMACHI Tsuyoshi, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 17 212 - 213 2008

4-4 Thermochemical Two-Step Water-Splitting Cycle by Fe_3O_4 supported on YSZ

HIRAIWA Eiji, UMEDA Jun, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 17 202 - 203 2008

4-5 Thermochemical two-step water-splitting cycle by ferrite supported on monoclinic zirconia

MURAYAMA Hiroko, HIRAIWA Eiji, UMEDA Jun, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 17 204 - 205 2008

Thermochernical cycles for high-temperature solar hydrogen production Reviewed

Tatsuya Kodama, Nobuyuki Gokon

CHEMICAL REVIEWS 107 ( 10 ) 4048 - 4077 2007.10

Preparation of size-controlled (30-100 nm) magnetite nanoparticles for biomedical applications Reviewed

K. Nishio, M. Ikeda, N. Gokon, S. Tsubouchi, H. Narimatsu, Y. Mochizuki, S. Sakamoto, A. Sandhu, M. Abe, H. Handa

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 ( 2 ) 2408 - 2410 2007.3

Identification of a chemical substructure that is immobilized to ferrite nanoparticles (FP) Reviewed

Kosuke Nishio, Nobuyuki Gokon, Makoto Hasegawa, Yuji Ogura, Morihito Ikeda, Hiroki Narimatsu, Masaru Tada, Yuki Yamaguchi, Satoshi Sakamoto, Masanori Abe, Hiroshi Handa

COLLOIDS AND SURFACES B-BIOINTERFACES 54 ( 2 ) 249 - 253 2007.2

Thermochemical Two-Step Water-Splitting Cycle by ZrO2-supported Fe3O4 for Solar Hydrogen Production Reviewed

Hiroko Murayama, Shingo Takahashi, Nobuyuki Gokon, Tatsuya Kodama

The 4th International Symposium on Advanced Materials in Asia-Pacific Rim, Niigata, Niigata, Japan, July 13-15 2007 2007

Reactive Fe-YSZ coated foam devices for solar two-step water splitting Reviewed

Tatsuya Kodama, Tomoki Hasegawa, Ayumi Nagasaki, Nobuyuki Gokon

PROCEEDINGS OF THE ENERGY SUSTAINABILITY CONFERENCE 2007 131 ( 2 ) 821 - 829 2007

Reactive Fe-YSZ coated foam devices for solar two-step water splitting Reviewed

Tatsuya Kodama, Tomoki Hasegawa, Ayumi Nagasaki, Nobuyuki Gokon

PROCEEDINGS OF THE ENERGY SUSTAINABILITY CONFERENCE 2007 821 - 829 2007

New solar water-splitting reactor with ferrite particles in an internally circulating fluidized bed Reviewed

Nobuyuki Gokon, Shingo Takahashi, Hiroki Yamamoto, Tatsuya Kodama

PROCEEDINGS OF THE ENERGY SUSTAINABILITY CONFERENCE 2007 831 - 839 2007

A Thermochemical Two-Step Water-Splitting Cycle with Magnetite-coated Ceramic Foam Device Reviewed

Ayumi Nagasaki, Koichi Sakai, Nobuyuki Gokon, Tatsuya Kodama

The 4th International Symposium on Advanced Materials in Asia-Pacific Rim, Niigata, Niigata, Japan, July 13-15 2007 2007

Double-Walled Tubular Reactor with Molten Salt Thermal Storage for Solar Reforming of Methane Reviewed

Shin-ichi Inuta, Daisuke Nakano, Yoshinori Hara, Nobuyuki Gokon, Tatsuya Kodama

The 4th International Symposium on Advanced Materials in Asia-Pacific Rim, Niigata, Niigata, Japan, July 13-15 2007 2007

A two-step water splitting with ferrite particles and its new reactor concept using an internally circulating fludized-bed Reviewed

Nobuyuki Gokon, Takayuki Mizuno, Shingo Takahashi, Tatsuya Kodama

Proceedings of the ASME International Solar Energy Conference 205 - 214 2007

Solar tubular reformer with molten-salt thermal storage - Design modification of the reactor tube and testing Reviewed

Tatsuya Kodama, Tsuyoshi Hatamachi, Daisuke Nakano, Youhei Igarashi, Nobuyuki Gokon

Proceedings of the ASME International Solar Energy Conference 197 - 204 2007

Solar Thermochemical Water-Splitting Reactor Using Internally-Fluidized Beds of Ferrite Particles, Reviewed

Nobuyuki Gokon, Shingo Takahashi, Hiroki Yamamoto, Tatsuya Kodama

International Symposium on Fusion Tech 2006-2007 at Niigata, Niigata, Japan, 17-19 January, 2007. 2007

Reactive Ferrite Devices for Solar Thermochemical Water Splitting Reviewed

Tatsuya Kodama, Nobuyuki Gokon

International Symposium on Fusion Tech 2006-2007 at Niigata, Niigata, Japan, 17-19 January, 2007. 2007

New solar water-splitting reactor with ferrite particles in an internally circulating fluidized bed Reviewed

Nobuyuki Gokon, Shingo Takahashi, Hiroki Yamamoto, Tatsuya Kodama

PROCEEDINGS OF THE ENERGY SUSTAINABILITY CONFERENCE 2007 131 831 - 839 2007

Iron-containing YSZ for the Thermochemical Water-Splitting and its Water-Splitting Device Reviewed

Tomoki Hasegawa, Yumiko Nakamuro, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2006-2007 at Niigata, Niigata, Japan, 17-19 January, 2007. 2007

Catalyst Properties and its Thermal Resistance of Foam Matrix for Methane Reforming under Concentrated Solar Radiation Reviewed

Takehiro Shimoyama, Yuusuke Oosawa, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2006-2007 at Niigata, Niigata, Japan, 17-19 January, 2007. 2007

Carbonate/Magnesia Composites for Thermal Storage in Solar Tubular Reformers Reviewed

Daisuke Nakano, Shinichi Inuta, Youhei Igarashi, Tsuyoshi Hatamachi, Nobuyuki Gokon, Tatsuya Kodama

International Symposium on Fusion Tech 2006-2007 at Niigata, Niigata, Japan, 17-19 January, 2007. 2007

4-5 Ni-ferrte/m-ZrO_2 for the thermochemical water-splitting and its internally-circulating fluidized bed reactor

TAKAHASHI Shingo, YAMAMOTO Hiroki, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 16 256 - 257 2007

Ru/Ni-Mg-O catalyzed SiC-foam absorber for solar reforming receiver-reactor Reviewed

Tatsuya Kodama, Takuya Moriyama, Takehiro Shimoyama, Nobuyuki Gokon, Hidemasa Andou, Nobuhiro Satou

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 128 ( 3 ) 318 - 325 2006.8

Direct detection of redox reactions of sulfur-containing compounds on ferrite nanoparticle (FP) surface Reviewed

Kosuke Nishio, Nobuyuki Gokon, Shingo Tsubouchi, Morihito Ikeda, Hiroki Narimatsu, Satoshi Sakamoto, Yasuo Izumi, Masanori Abe, Hiroshi Handa

CHEMISTRY LETTERS 35 ( 8 ) 974 - 975 2006.8

Double-walled reactor tube with molten salt thermal storage for solar tubular reformers Reviewed

T Hatamachi, T Kodama, Y Isobe, D Nakano, N Gokon

JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME 128 ( 2 ) 134 - 138 2006.5

Novel Synthetic Clays for Cation Exchange Reviewed

T. Kodama, N. Gokon, S. Komarneni

Advance in Science and Technology 45 209 - 217 2006

Ru/Ni-Mg-O catalyzed SiC-foam absorber for solar reforming receiver-reactor Reviewed

Tatsuya Kodama, Takuya Moriyama, Takehiro Shimoyama, Nobuyuki Gokon

Solar Engineering 2005 697 - 705 2006

Iron-containing YSZ (Yttrium-Stabilized Zirconia) system for a two-step thermochemical water splitting Reviewed

N. Gokon, T. Mizuno, Y. Nakamuro, T. Kodama

13th International Symposium on Concentrated Solar Power and Chemical Energy Technologies, Seville Spain, June 20-23, 2006. 2006

A new solar chemical reactor with an internally circulating fluidized bed for direct irradiation of reacting particles Reviewed

T. Kodama, S. Enomoto, T. Hatamachi, N. Gokon

13th International Symposium on Concentrated Solar Power and Chemical Energy Technologies, Seville Spain, June 20-23, 2006. 2006

Double-walled reactor tube with molten salt thermal storage for solar tubular reformers Reviewed

T. Hatamachi, T. Kodama, Y. Isobe, D. Nakano, N. Goukon

Solar Engineering 2005 691 - 695 2006

4-5. Solar thermal water-splitting with internally-circulating fluidized bed of ferrite/m-ZrO2 system

GOKON Nobuyuki, TAKAHASHI Shingo, MIZUNO Takayuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 15 279 - 280 2006

Solar thermochemical process for hydrogen production using ferrites Reviewed

H Kaneko, N Gokon, N Hasegawa, Y Tamaura

ENERGY 30 ( 11-12 ) 2171 - 2178 2005.8

Novel Medical Ferrite Nanobeads with Bioactive Molecules Immobilized Strongly onto the Surfaces Reviewed

Masanori Abe, Nobuhiro Matsushita, Masaru Tada, Nobuyuki Gokon, Kosuke Nishio, Hiroshi Handa

Material Research Society Symposium, San francisco, U.S.A., March 28-April 1, 2005. 2005

Polymer coating of ferrite nanoparticles by using "connecter" chemical compounds Reviewed

S Tsubouchi, K Nishio, M Ikeda, H Narimatsu, M Hatakeyama, N Gokon, H Handa, M Abe

NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9) 449 - 454 2005

4-5. Effect of Ni-doping into Ferrite on Two-Step Water-Splitting Cycle and Its Devices

MIZUNO Takayuki, HASEGAWA Tomoki, GOKON Nobuyuki, KODAMA Tatsuya

Proceedings of the Annual Conference of The Japan Institute of Energy 14 234 - 235 2005

Solar hydrogen generation with H2O/ZnO/MnFe2O4 system Reviewed

M Inoue, N Hasegawa, R Uehara, N Gokon, H Kaneko, Y Tamaura

SOLAR ENERGY 76 ( 1-3 ) 309 - 315 2004

Synthesis of monodisperse ferrite nanoparticles coated with polyacrilic acid (PAA) Reviewed

K. Nishio, M. Hasegawa, M. Ikeda, H. Narimatsu, Y. Hase, Y. Ogura, N. Gokon, S. Tsubouchi, M. Hatakeyama, M. Abe, H. Handa

Transactions of the Materials Research Society of Japan 29 ( 4 ) 1659 - 1662 2004

Decomposition of Zn-ferrite for O-2 generation by concentrated solar radiation Reviewed

H Kaneko, T Kodama, N Gokon, Y Tamaura, K Lovegrove, A Luzzi

SOLAR ENERGY 76 ( 1-3 ) 317 - 322 2004

Photocatalytic effect of ZnO on carbon gasification with CO2 for high temperature solar thermochemistry Reviewed

N Gokon, N Hasegawa, H Kaneko, H Aoki, Y Tamaura, M Kitamura

SOLAR ENERGY MATERIALS AND SOLAR CELLS 80 ( 3 ) 335 - 341 2003.11

A high magnetic field effect on the M(II)-substituted magnetite formation (M = Ni, Mn, Co) in the wet process Reviewed

N Gokon, N Hasegawa, H Kaneko, T Ohara, Y Tamaura

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 256 ( 1-3 ) 293 - 300 2003.1

Synthesis of monodisperse ferrite nanoparticles coated with polyacrilic acid (PAA) Reviewed

K. Nishio, M. Hasegawa, M. Ikeda, H. Narimatsu, Y. Hase, Y. Ogura, N. Gokon, M. Abe, H. Handa

Material Research Society Japan, Yokohama, Japan, 11?13 October 2003. 2003

Reaction mechanism of H-2 generation for H2O/Zn/Fe3O4 system Reviewed

H Kaneko, N Kojima, N Hasegawa, M Inoue, R Uehara, N Gokon, Y Tamaura, T Sano

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 27 ( 10 ) 1023 - 1028 2002.10

The magnetic coagulation reaction between paramagnetic particles and iron ions coprecipitates Reviewed

N Gokon, A Shimada, N Hasegawa, H Kaneko, Y Tamaura, K Ito, T Ohara

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 246 ( 1-2 ) 275 - 282 2002.4

Magnetic coagulation and reaction rate for the aqueous ferrite formation reaction Reviewed

N Gokon, A Shimada, H Kaneko, Y Tamaura, K Ito, T Ohara

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 238 ( 1 ) 47 - 55 2002.1

Hiroshi Kaneko, Nobuyuki Gokon, Noriko Hasegawa, Masafumi Inoue, Reiko Uehara, Yutaka Tamaura

Eco-Engineering 14 ( 4 ) 3 - 9 2002

Language：English Publisher：The Society of Eco-Engineering

Two-step water splitting with Zn/Fe3O4 - ZnFe2O4 reaction system is suggested for H2 generation to utilize concentrated solar heat. When mixture of Zn and Fe3O4 was heated to 873 K and steam was passed through, the H2 was obtained in 93.4% of the theoretical yield. Formation of ZnFe2O4 with several zinc content (ZnxFe3-xO4; 0.2≤x≤l) and ZnO was determined by XRD and Mössbauer spectroscopy. The yield of ZnO was 26-29%, which shows the ratio of the competition-reaction (H2O Zn system) effects less in the total H2 yield. O2 generation (also energy storage) step can be proceeded at the temperature of ca. 1800 K. The reaction took place very fast, and it can be seen that a large amount of O2 was released from irradiated ZnFe2O4. The stoichiometry and the reaction mechanism of the system are discussed upon the analyses for the solid product.

DOI： 10.11450/seitaikogaku.14.4_3

フェリ磁性体を用いた環境水中のリン及び重金属イオンの磁気分離 Reviewed

郷右近展之, 島田綾乃, 長谷川紀子, 金子宏, 小原健司, 玉浦裕

水環境学会誌 25 ( 1 ) 33 - 38 2002

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment

To develop a practical environmental protection technology for purification of lakes, ponds and arm of the sea, an efficient magnetic separation system for phosphate and heavy metal ions removal was studied using ferrimagnetic fine particles (FMFP), which can be prepared from Fe2+ and Fe3+ ions in the alkali aqueous solution. With the Fe3+ ions of 15 mg·l-1 (without addition of FMFP), the phosphate ion recovery decreased from 80% to 20% with decreasing the magnetic field from H=8T to 0.8T. By addition of the FMFP of 5 mg·l-1 along with the Fe3+ ions of 15 mg·l-1, above 95% recovery was achieved in a wide range of the magnitude of magnetic field (H=0.8-8T). In case of using cadmium ion instead of the phosphate ion, addition of the FMFP of 5 mg·l-1 together with the Fe3+ ions of 20 mg·l-1 enhanced recovery of the Cd2+ ion. We demonstrated that in the presence of the FMFP all of the heavy metal ions were recovered 80% yields or more. These would come from a high magnetic gradient characteristically generated on the surface of FMFP, which results in the enhancement of the magnetic coagulation of the complex with the phosphate or the heavy metal ions and the Fe3+ ions.

DOI： 10.2965/jswe.25.33