铬酸酐电化学合成中阳极液在钛基多元金属氧化物复合电极上的电化学研究  

Electrochemical study on anolyte for electrosynthesis of chromic anhydride on combination electrode of titanium matrix with multiple-unit metal oxides coating

作　　者：李成未[1] 齐涛[2] 王福安[1] 张懿[2] 陈根生[1] 

机构地区：[1]郑州大学化工学院,河南郑州450002 [2]中国科学院过程工程研究所,北京100080

出　　处：《化工学报》2008年第3期670-672,共3页CIESC Journal

基　　金：国家自然科学基金重点项目(50234040);国家高技术研究发展计划项目(2005AA647010)~~

摘　　要：A new green technology of producing chromic anhydride with an electrochemical synthesis method was studied to solve the pollution problems in the traditional production process of chromic anhydride.The anolyte used was sodium dichromate solution, and the anode used was a self-made combination electrode of titanium matrix with a multiple-unit metal oxides active coating.The electrochemical behavior of sodium dichromate solution on a combination electrode of titanium matrix was studied with cyclic voltammetry as a part of the fundamental researches of this technique.The electrooxidation reaction of 160 cycles indicated that the electrode possessed a very stable electrochemical behavior.The peak currents ip and peak potentials Ep of the oxidation peaks for sodium dichromate solution of different concentrations, i.e., water under the existence of sodium dichromate, were experimentally measured at different temperatures and sweep rates v on the electrode.The equations of peak current ip versus v1/2 and peak potential Ep versus lnv were established, indicating that the electrode reaction was an irreversible diffusion-controlled reaction.The kinetic parameters and activation energy of electrode reaction was calculated, and the effects of temperature on the kinetic parameters and activation energy were preliminarily discussed.A new green technology of producing chromic anhydride with an electrochemical synthesis method was studied to solve the pollution problems in the traditional production process of chromic anhydride. The anolyte used was sodium dichromate solution, and the anode used was a self-made combination electrode of titanium matrix with a multiple-unit metal oxides active coating. The electrochemical behavior of sodium dichromate solution on a combination electrode of titanium matrix was studied with cyclic voltammetry as a part of the fundamental researches of this technique. The electrooxidation reaction of 160 cycles indicated that the electrode possessed a very stable electrochemical behavior. The peak currents ip and peak potentials Ep of the oxidation peaks for sodium dichromate solution of different concentrations, i.e. , water under the existence of sodium dichromate, were experimentally measured at different temperatures and sweep rates v on the electrode. The equations of peak current ip versus v^1/2 and peak potential Ep versus lnv were established, indicating that the electrode reaction was an irreversible diffusion-controlled reaction. The kinetic parameters and activation energy of electrode reaction was calculated, and the effects of temperature on the kinetic parameters and activation energy were preliminarily discussed.

关 键 词：重铬酸钠 电化学合成 循环伏安法 不可逆反应 动力学参数 

分 类 号：TQ243[化学工程—有机化工]