Dechlorination of Benzenyltrichloride in CH3CN Solvent at a Silver Cathode

作者：Xu Ying-Hua; Ma Hong-Xing; Cai Qian-Qian; Zhu Ying-Hong; Ma Chun-An^*

来源：Acta Physico - Chimica Sinica, 2013, 29(5): 973-980.

DOI：10.3866/PKU.WHXB201302283

• Ag electrode
• Reductive dechlorination
• Dechlorination mechanism
• Wide anode region CV
• Adsorption of Cl-

The reductive dechlorination mechanism of benzenyltrichloride at an Ag cathode was investigated using cyclic voltammetry (CV) and potentiostatic electrolysis, in CH3CN solvent containing 0.1 mol.L-1 tetrabutylammonium perchlorate (TBAP). The adsorption of Cl- generated during dechlorination was detected using wide anode region CV, based on its anodic reaction with Ag. The CV results indicated that: (1) Ag exhibited better electrocatalytic activity than Hg for the dechlorination; (2) the first reduction peak, which was divided from the reduction peak of benzenyltrichloride at -1.19 V (vs Ag/Ag+) when the scan rate was <= 50 mV.s(-1), is an adsorption controlled process and its electron transfer occurred in a concerted way, and the electron transfer coefficient is approximately 0.25; (3) the potential region where departing Cl- adsorbed on Ag ranged from -0.75 to -1.75 V (vs Ag/Ag+). The electrolysis results indicated that dechlorination product selectivity was strongly dependent on the Ag electrode potential.

• 出版日期2013-5
• 单位浙江工业大学