| Project/Area Number |
10558072
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
エネルギー学一般
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
KODAMA Tatsuya Faculty of Engineering, NIIGATA UNIVERSITY, Associate Professor, 工学部, 助教授 (60272811)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Yoshio Nikki Chemical Co., Ltd R&D Department Research Associate, 開発研究所, 研究員
KITAYAMA Yoshie Faculty of Engineering, NIIGATA UNIVERSITY, Professor, 工学部, 教授 (70018472)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Concentrated Solar heat / Natural Gas / Solar Fuel / Methane Reforming / Methane Coupling / Energy Conversion / Water Decomposition / Catalyst / エネルギー転換率 / 金属酸化物 / 熱化学サイクル |
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| Research Abstract |
Thermochemical redox Cycles for converting methane to calorie-upgraded chemical fuels of H_2, CO and C_2-hydrocarbon were investigated for the purpose of efficiently converting unutilized heat, such as concentrated solar heat, to chemical fuels below 1273 K.The following thermochemical cycles using a metal-oxide redox system were examined.
1. Methane reforming/Water Decomposition Cycle
CH_4+M_xO_y→M_xO_<y-m-n-1>+(1-n)CO+nCO_2+(2-m)H_2+mH_2O
M_xO_<y-m-n-1>+(m+n+1)H_2O→M_xO_y+(m+n+1)H_2
The reactive working materials of WO_3/ZrO_2 and Ni_<0.39>Fe_<2.61>O_4/ZrO_2 were prepared for this redox cycle. Especially, the cycle using Ni_<0.39>Fe_<2.61>O_4/ZrO_2 could be repeated below 1173K, yielding 40-60% methane conversion. The syngas produced in the first reaction step has a H_2/CO molar ratio of about two, which is suitable for methanol production. Also almost pure hydrogen was obtained in a separate second step.
2. Methane Coupling/Water Decomposition Cycle
2CH_4+M_xO_y→M_xO_<y-2>+C_2H_4+2H_2O
M_xO_<y-2>+2H_2O→M_xO_y+2H_2
The reactive working material of SnO_2/Fe_3O_4/SiO_2 was prepared for this cycle. methane was also highly selectively converted to C_2-hydrocargon and H_2 by a single-step reaction mode of co-feeding methane and steam over SnO_2/Fe_3O_4/SiO_2 at 1173K.In comparison with earlier studies on methane coupling using steam as an oxidant, our experimental data gave the higher C_2-formation rate with a high C_2-selectivity.
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