铬酸酐电催化合成过程阳极稳定性与析气效应研究  

Study on the anode stability and gas evolution effect in electrocatalytic synthesis of chromic anhydride

作　　者：李成未 LI Cheng-wei(School of Chemistry and Environment,Henan Finance University,Zhengzhou 450046,China)

机构地区：[1]河南财政金融学院化学与环境学院

出　　处：《化学研究与应用》2019年第12期2071-2077,共7页Chemical Research and Application

基　　金：河南省科技攻关重点项目(122102310330)资助

摘　　要：针对铬酸酐传统生产技术存在的高污染、高消耗、工艺落后等问题,研究了以重铬酸钾为原料,电催化合成铬酸酐绿色新技术。循环伏安法研究了阳极的电催化性能,扫描电镜分析了表面形貌。结果表明,自制钌/铱/钛氧化物复合阳极在阳极电解液中具有较低的析氧过电位和稳定的高催化活性。实验测得不同反应条件下阴极析氢速率,建立了析氢速率和析氢量随阳极液重铬酸钾初始浓度、反应温度及反应时间变化的数学模型,指出阴极析氢速率可用于定量表征铬酸酐电催化反应进程,讨论了析氢速率和析氢量的影响因素。To solve the problems such as high pollution,high consumption and backward technology existing in the traditional production technology of chromic anhydride,a new green technology of electrocatalytic synthesis of chromic anhydride from potassium dichromate was studied.Cyclic voltammetry has been used to investigate the electro-catalytic performance of anode,and the morphology and structure of anode were characterized by FESEM.The results indicated that the RuO2-IrO2-TiO2 composite anode exhibited lower over potential for oxygen evolution in anolyte,and stable and high electrocatalytic activity.The hydrogen evolution rates of cathode at different reaction conditions were experimentally measured in the electrocatalysis synthesis process of chromic anhydride.The mathematical models were established for the dependence of hydrogen evolution rate and hydrogen evolution amount on initial potassium dichromate concentration,reaction temperature,and reaction time.It was pointed out that the cathodic hydrogen evolution rate quantitatively measured may be used to characterize the electrocatalytic reaction process of chromic anhydride,and the influencing factors of hydrogen evolution rate and hydrogen evolution amount were discussed.

关 键 词：铬酸酐 电催化合成 析氢速率 析氢量 数学模型 

分 类 号：TQ136.11[化学工程—无机化工]