Faculty Profiles - GOKON Nobuyuki

Papers - GOKON Nobuyuki

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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

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

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