| Project/Area Number |
62550592
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業物理化学
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| Research Institution | Yamaguchi University |
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Principal Investigator |
OGURA Kotaro Yamaguchi Univ., Faculty of Engineering, 工学部, 教授 (40035077)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAOKA Tsuto u Yamaguchi Univ., Faculty of Engineering, 工学部, 講師 (00172510)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | carbon dioxide / carbon monoxide / electrode mediator / homogeneous catalysis / 接触電気化学的還元 |
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| Research Abstract |
Recently, many environmental problems has been pointed out which are caused by the increase of CO_2 in the atmosphere. One of the most serious problems is a rise in temperature due to the buildup of the greenhouse effect. Hence, the study on the reduction of carbon dioxide attracts attention. However, the reduction of CO_2 is very difficult, and it is carried out at elevated temperature and in high pressure.
In the present study, CO and CO_2 was catalytically reduced to methanol in the presence of homogeneous catalysis with an electrode mediator, and the reduction mechanism was investigated. The results obtained are as follows:
(1) CO and CO_2 were reduced to methanol with high current efficiency.
(2) Both IR and ^<13>C-NMR spectra showed the existence of H^<13>COOH, and hence it was suggested that the reduction of CO and CO_2 proceed via meythylformate as an intermediate.
(3) The isotope distribution measured by mass analysis showed the formation of CD_3OH and ^<13>CH_3OH.
(4) Consequently, the electrocatalytic reduction of CO and CO_2 proceeds by the following scheme: a weak coordination bond is first formed between the central metal and methanol, followed by the insertion of CO_2 (or CO) to form an intermediate metal-ligand-formate complex, and this complex is finally reduced by the electrode mediator with the consumption of protons in solution to methanol and initial metal complex.
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