Faculty Profiles - GOKON Nobuyuki

Papers - GOKON Nobuyuki

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

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

CiNii Article

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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

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Other Link： https://jlc.jst.go.jp/DN/JALC/00155190656?from=CiNii

Methane reforming with CO2 in molten salt using FeO catalyst Reviewed

N Gokon, Y Oku, H Kaneko, Y Tamaura

SOLAR ENERGY 72 ( 3 ) 243 - 250 2002

Thermodynamic study based on the phase diagram of the Na2O-MnO-Fe2O3 system for H-2 production in three-step water splitting with Na2CO3/MnFe2O4/Fe2O3 Reviewed

H Kaneko, Y Ochiai, K Shimizu, Y Hosokawa, N Gokon, Y Tamaura

SOLAR ENERGY 72 ( 4 ) 377 - 383 2002

Ferrite formation reaction using Fe2+/Fe3+ suspension solution in wet process in magnetic fields Reviewed

Nobuyuki Gokon, Noriko Hasegawa, Hiroshi Kaneko, Yutaka Tamaura, Takeshi Ohara

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 49 ( 8 ) 710 - 716 2002

Ferrimagnetic coagulation process for phosphate ion removal using high-gradient magnetic separation Reviewed

N Gokon, A Shimada, N Hasegawa, H Kaneko, M Kitamura, Y Tamaura

SEPARATION SCIENCE AND TECHNOLOGY 37 ( 16 ) 3781 - 3791 2002

Studies on metal oxides suitable for enhancement of the O-2-releasing step in water splitting by the MnFe2O4-Na2CO3 system Reviewed

H Kaneko, Y Hosokawa, N Kojima, N Gokon, N Hasegawa, M Kitamura, Y Tamaura

ENERGY 26 ( 10 ) 919 - 929 2001.10

Stoichiometric studies of H-2 generation reaction for H2O/Zn/Fe3O4 system Reviewed

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

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 26 ( 9 ) 917 - 922 2001.9

Enhancement of Op-releasing step with Fe2O3 in the water splitting by MnFe2O4-Na2CO3 system Reviewed

H Kaneko, Y Hosokawa, N Gokon, N Kojima, N Hasegawa, M Kitamura, Y Tamaura

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 62 ( 7 ) 1341 - 1347 2001.7

Solar Hydrogen Generation with H2O/ZnO/MnFe2O4 System Reviewed

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

International Solar Energy Society 2001 Solar World Congress, Adelaide, Australia, November 25-30, 2001. 2001

Oxygen uptake and release mechanism of lithium manganese ferrite in the low temperature range of 573-773 K Reviewed

T Sano, M Tsuji, N Gokon, H Kaneko, Y Tamaura

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 83 ( 10 ) 2509 - 2514 2000.10

Growth behavior of fine grains formed by diffusion induced recrystallization in the Cu(Zn) system Reviewed

N Goukon, T Ikeda, M Kajihara

ACTA MATERIALIA 48 ( 11 ) 2959 - 2968 2000.6

Boundary energies of Sigma 11 [110] asymmetric tilt boundaries in Cu determined from the shape of boundary silica particles Reviewed

N Goukon, T Yamada, M Kajihara

ACTA MATERIALIA 48 ( 11 ) 2837 - 2842 2000.6

Characteristic features of diffusion induced grain boundary migration for Sigma 9 [110] asymmetric tilt boundaries in the Cu(Zn) system Reviewed

N Goukon, T Ikeda, M Kajihara

ACTA MATERIALIA 48 ( 7 ) 1551 - 1562 2000.4

Cu双結晶における[110]ねじれ粒界および傾角粒界の材料組織学的性質 Reviewed

郷右近展之

東京工業大学 2000

Solar H2 Production by Two Step Water Splitting with Zn-Ferrite-Fe3O4 System Reviewed

Y. TAMAURA, N. HASEGAWA, N. KOJIMA, N.GOKON, H. KANEKO

International Conference on Ferrite, Kyoto, September 18-21, 2000. 2000

Methane Reforming with CO2 in Molten Salt Using FeO Catalyst Reviewed

N. GOKON, Y. OKU, H. KANEKO, Y. TAMAURA

International Conference on Ferrite, Kyoto, September 18-21, 2000. 2000

H2 Generation by H2O/Zn/Fe3O4 Reaction System Reviewed

N. KOJIMA, N. HASEGAWA, R. UEHARA, N. GOKON, H. KANEKO, Y. TAMAURA

International Conference on Ferrite, Kyoto, September 18-21, 2000. 2000

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