摘要
考察了草酸电解还原制乙醛酸过程中铅阴极失活的因素。实验表明,电解产物乙醛酸在电极表面的吸附量ΓR随着反应的进行不断增大,电流效率也随之大幅下降。尽管电解过后的铅电极表面可能形成草酸铅及氧化铅颗粒,导致反应物与电极表面接触区域减小,从而使得反应速率下降,但仍没有电解液组成变化对电流效率的影响大。而低析氢过电位金属在浓度较低时,电极表面的沉积对电流效率降低的影响并不显著。
The influencing factors of cathode deactivation during electro-reduction of oxalic acid have been studied.The results show that the adsorption of glyoxylic acid on the electrode increases with the time of electro-reduction,causing the great decrease of current efficiency.Although EDS results show that possible lead oxide coating on the electrode surface gives rise to some current efficiency decline,such influence is less than the adsorption of glyoxylic acid.In addition,copper ion with low hydrogen evolution potential has less effect on the current efficiency at low concentration level.
出处
《现代化工》
CAS
CSCD
北大核心
2014年第6期58-61,共4页
Modern Chemical Industry
关键词
草酸
电解还原
乙醛酸
阴极失活
电流效率
oxalic acid
electro-reduction
glyoxylic acid
cathode deactivation
current efficiency
