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.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
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)。
