Electrochemical reduction of carbon dioxide in methanol at ambient temperature and pressure

被引:47
|
作者
Ohta, K [1 ]
Kawamoto, M
Mizuno, T
Lowy, DA
机构
[1] Mie Univ, Dept Chem Mat, Tsu, Mie 514, Japan
[2] Univ Memphis, Dept Chem, Memphis, TN 38152 USA
关键词
electroorganic reduction; carbon dioxide; methanol; electrocatalysis; bensalkonium chloride;
D O I
10.1023/A:1003298212137
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The electrochemical reduction of carbon dioxide was studied in methanol-based supporting electrolytes on various metal electrodes at ambient temperature and pressure. The ionophore of the catholyte was benzalkonium chloride, [RN(CH3)(2)CH2C6H5](+) Cl-, where R = C-8-C-18, the chain length being distributed around C-14 A divided H-type cell was used, the supporting electrolytes were 10(-2) mol dm(-3) benzalkonium chloride in double distilled methanol (catholyte) and a 10(-1) mol dm(-3) aqueous KHCO3 solution (anolyte). Nine different, high purity (> 99.5%) metal electrodes were used: Ti, Fe, Co, Ni, Pt, Ag, Au, Zn and Sn. Carbon monoxide, methane and ethane were the main organic products. Silver, Au, Zn and Sn cathodes allowed for the best faradaic yields of CO production, the maximum amount of CO (71%, 185 mmol) being formed on the Ag electrode. Methane evolved on each of the nine tested electrodes, with current yields in the range from 0.2 to 3.0%. Ethane and ethylene were produced on the nickel electrode, with low faradaic efficiencies, 0.5 and 0.3%, respectively. No dimerization products were detected. This research can contribute to large-scale manufacturing of useful organic products from a readily available and cheap raw material: CO2-saturated methanol from industrial absorbers (the Rectisol process).
引用
收藏
页码:717 / 724
页数:8
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