KOH/甲醇溶液中Pb电极上电化学还原CO_2  

Electrochemical Reduction of CO_2 on a Pb Electrode in KOH-Methanol Solution

作　　者：宋爽[1] 何志桥[1] 叶杰旭[1] 陈建孟[1] 

机构地区：[1]浙江工业大学生物与环境工程学院,浙江杭州310032

出　　处：《高校化学工程学报》2006年第6期957-962,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(50408024);浙江省自然科学基金(M203034;Y505036)。

摘　　要：化学转化CO2为更有价值的物质对于缓解大气中的温室气体极为重要。以Pb片为工作电极,石墨电极为对电极,银-氯化银电极为参比电极,研究了0.1mol?L?1KOH/甲醇电解液中电化学还原CO2的行为。结果表明,在所考察的范围内,常压下CO和甲酸生成的法拉第效率在258K时最大,分别为9.62%和78.74%,常温加压条件下,CO2压力为1.2MPa时CO和甲酸生成的法拉第效率最大,分别为13.93%和24.00%。进一步进行电极反应的动力学研究,得CO2电化学还原生成CO和甲酸的反应级数分别为0.573和0.671。The chemical conversion of CO2 to more valuable substances is a very important subject in connection with the mitigation of the concentration of green-house gas in the atmosphere. In this study, the electrochemical reduction of CO2 on a Pb electrode at different temperatures and pressures was investigated by using 0.1 mol·L^-1 KOH/methanol as electrolyte. A graphite electrode was employed as the counter electrode, and an Ag-AgCl （sat. KCl） electrode was used as the reference electrode. The maximum faradaic efficiency of forming CO is 9.62% and forming formic acid is 78.74% at 258K and ambient pressure. At ambient temperature and 1.2 MPa the maximum faradaic efficiency of forming CO and forming formic acid are 13.93% and 24.00%, respectively. Kinetic analysis indicates that the reaction orders are 0.573 for electrochemical reduction of CO2 to CO and 0,671 for electrochemical reduction of CO2 to HCOOH in the cathodic direction.

关 键 词：二氧化碳 电化学 PB电极 KOH/甲酵电解液 动力学 

分 类 号：TQ150.5[化学工程—电化学工业] TQ150.9