Hydrochlorination of acetylene performance over urea-modified Xinjiang coal-based carbon supported copper catalyst
Developing of environmental friendly,high-efficiency,stable and low-cost non-mercury catalyst is the key to PVC production using coal-route-based acetylene hydrochlorination.To improve the current problems of low catalytic activity and poor stability of copper(Cu)-based catalysts applied in the acetylene hydrochlorination reactions,a series of Cu/Urea-CAC catalysts were prepared by urea mod-ification strategies and the effects of the urea addition and Cu loading on the catalytic performances of catalysts for acetylene hydrochlorina-tion were investigated.When the urea content is 15％and the Cu loading is 20％,the Cu/Urea-CAC catalyst reveal the optimal catalytic performance with the 92.6％C2H2 conversion and 98.2％vinyl chloride selectivity under the reaction conditions of 160 ℃,a C2H2 gas hourly space velocity of 120 h-1 and molar ratio of hydrogen chloride to acetylene is 1.25.Combination with the characterization results of XPS,XRD,SEM,N2 adsorption and desorption,ICP-OES and TG techniques,it is suggested that the enhanced catalytic performance is mainly related to the appropriate urea addition,which can effectively inhibit Cu species reduction and loss,and decrease the carbon dep-osition,thereby improving the catalytic performance activity of Cu-supported on Xinjiang coal-based carbon catalysts for acetylene hydro-chlorination.The results will expand the application of Xinjiang coal-based carbon and provide theoretical support for the design,synthesis and catalysis of a new catalytic system for acetylene hydrochlorination.
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