Liquid-phase hydrogenation of carbon tetrachloride catalyzed by three-dimensional graphene-supported palladium catalyst

Abstract

Abstract In this article, a three-dimensional graphene (3DGN)-supported palladium metal catalyst was prepared by the impregnation method with noble metal palladium as the active component, aiming to synthesize a catalyst with high activity and high selectivity. Its catalytic performance in liquid-phase hydrochlorination of carbon tetrachloride (TTCM) was investigated. The influences of different Pd loadings, reduction temperatures, and reaction temperatures on the catalytic hydrogenation reaction were studied. The purpose is to explore the best operating conditions for the preparation of chloroform. The results show that the 3DGN-supported palladium catalyst exhibits excellent catalytic performance and high selectivity to chloroform in the hydrogenation of TTCM. When the Pd loading was 1.0 wt%, the reduction temperature was 773 K, and the hydrochlorination reaction temperature was 398 K, the conversion of TTCM was as high as 98.12%, and the selectivity of chloroform was 85.23%. The main by-product is dichloromethane. The selectivity of chloroform is affected by the increasing temperature but remains above 80%.