| Project/Area Number |
08555192
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
反応・分離工学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
ASAEDA Masashi Department of Chemical Engineering, HIROSHIMA UNIVERSITY Professor, 工学部, 教授 (40026224)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIOKA Tomohisa Department of Chemical Engineering, HIROSHIMA UNIVERSITY Research associate, 工学部, 助手 (50284162)
TSURU Toshinori Department of Chemical Engineering, HIROSHIMA UNIVERSITY Associate professor, 工学部, 助教授 (20201642)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1997: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1996: ¥3,300,000 (Direct Cost: ¥3,300,000)
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| Keywords | hydrogen / methane / steam reforming / thorganic membrane / membrane reactor / catalytic membrane |
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| Research Abstract |
The purpose of the present study is preparation of hydrogen semi-permeable membranes by sol-gel method and the application of the membranes for methane steam reformig (CH_4=CO+3H_2, CO+H_2O=CO_2+H_2. Methane steam reforming is a reaction governed by the thermodynamic equilibrium where removing one of the products (H_2 or CO,CO_2) could shift the equilibrium conversion. Ceramic ultramicroporous membranes which have permselectivity towards hydrogen were found to be prepared by colloidal routes of silica-zirconia and silica, and found to have excellent stability at high temperature up to 550 ﾟC ; however, the membrane permselectivity decreased with time in steam atmosphere because of further sintering of the separation layr. We have found that firing the coated membranes in steam atmosphere was effective to improve the stability at high temperature (500-570 ﾟC) even in steam atmohsphere. Afterwards, the hydrogen semipermeable membranes were coated with nickel nitrate having catalytic activity for steam reforming to be converted to so-called catalytic membranes, and applied for the methane steam reforming. Without removing hydrogen in the permeate stream, that is, in conventional reaction system, the reaction conversion was 45 %, which was below the equilibrium conversion (65%) at 450 ﾟC.By removing hydrogen from the permeate stream, the conversion increased up to 75%, which clearly shows that catalytic membrane system was effective to shif the apparent equilibrium of the conversion and improve the productivity of the reaction.
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