间氯苯甲酸在Pd/Ti电极上的电化学脱氯反应  

Studies on Electrochemical Dechlorination Reaction of 3-Chlorobenzoic Acid on Pd/Ti Electrode

作　　者：李美超[1] 尤楠楠[1] 马淳安[1] 

机构地区：[1]浙江工业大学分析测试中心化学工程与材料学院绿色化学合成技术国家重点实验室培育基地,杭州310032

出　　处：《化学学报》2011年第23期2762-2766,共5页Acta Chimica Sinica

基　　金：国家"九七三"前期研究专项课题(No.2003CCA01300)资助项目

摘　　要：以Ti为基底电极,在PdCl2溶液中电沉积制备了Pd/Ti电极,采用SEM和XPS进行表征.采用循环伏安法研究了Cu,Ag,Ti和Pd/Ti电极对间氯苯甲酸(3-CBA)的电还原特性,与Cu,Ag和Ti电极相比,Pd/Ti电极对3-CBA有较好的电化学还原活性.同时采用电化学原位红外反射光谱对3-CBA在Pd/Ti电极上的电还原反应机理进行了系统分析,结果表明3-CBA在Pd/Ti电极上的电化学脱氯反应是一个脱氯加氢过程,3-CBA首先得到一个电子形成阴离子自由基中间体,随后释放一个氯离子,产生苯甲酸盐的自由基,最后该自由基得到一个电子并夺取一个氢质子,在电极表面脱去氯得到最终产物苯甲酸.Pd/Ti electrode was prepared on Ti substrate electrode using cyclic voltammetry in hydrochloric acid containing PdCl2.The electrocatalytic performance toward electrochemical reduction reactivity of 3-chlorobenzoic acid（3-CBA） on Cu,Ag,Ti and Pd/Ti electrodes was investigated by cyclic voltammetry.Compared with Cu,Ag and Ti electrodes,Pd/Ti electrode exhibited a high electrochemical activity for the reduction process of 3-CBA in NaOH solution.In situ FTIR was applied to analyze the electrochemical dechlorination mechanism of 3-CBA systematically.The results showed that 3-CBA was electroreduced to its free radical ion after receiving an electron.Then the 3-CBA free radical took off a chloride ion and produced the benzoic acid free radical.After receiving another electron and a proton,the final product benzoic acid was obtained.

关 键 词：间氯苯甲酸 Pd/Ti电极 电化学脱氯 原位红外光谱 

分 类 号：O625.42[理学—有机化学]