文献类型：期刊文献

英文题名：Trimetallic Au-Cu-K/AC for acetylene hydrochlorination

作者：Wang, Lei[1,2];Shen, Benxian[1];Zhao, Jigang[1,3];Bi, Xiaotao[3]

机构：[1]East China Univ Sci & Technol, Res Inst Petr Proc, Shanghai 200237, Peoples R China;[2]Tianjin Dagu Chem Co Ltd, Tianjin 300455, Peoples R China;[3]Univ British Columbia, Chem & Biol Engn Dept, Vancouver, BC V6T 1Z3, Canada

年份：2017

卷号：95

期号：6

起止页码：1069

外文期刊名：CANADIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20170303266107);WOS:【SCI-EXPANDED(收录号:WOS:000399913800006)】；

基金：The financial support from the China Scholarship Council (CSC) and Fundamental Research Funds for the Central Universities (No. WA1214003) are gratefully acknowledged.

语种：英文

外文关键词：mercury-free catalyst; acetylene hydrochlorination; gold; copper; whisker carbon deposition

摘要：The metal chloride of KCl was chosen to modify Au-Cu/AC to decrease the noble metal of gold and enhance the catalytic performance. Then a mercury-free catalyst of Au-Cu-K/AC was prepared by the impregnation method. The catalytic performances of mercury-free catalyst for acetylene hydrochlorination were conducted for 1600h in a fixed bed reactor by a single-tube pilot unit. The fresh and used catalysts were also characterized in comparison. The results showed that the acetylene conversion on mercury-free catalyst decreased slowly from 98% to 89%, and the vinyl chloride monomer (VCM) selectivity was kept at 99.7% under reaction conditions of temperature 165 degrees C, gas hourly space velocity (GHSV) 40h(-1), and feed volume ratio of HCl to C2H2 of 1.05 during 1600h on stream. The results showed that the additives of K with Cu can make the active species of gold dispersed well and retard the aggregation of particles. The reason for the slow decline of acetylene conversion for Au-Cu-K/AC catalyst was the whisker carbon deposition, shown in a faint yellow colour over the catalyst surface, which consisted of short-chain hydrocarbon molecules. Further study for accelerated deactivation of sole metal in the catalyst gives the clues that the non-noble metal of Cu in Au-Cu-K/AC catalyst plays a key role to form the deposition.