PREPARATION AND CATALYTIC PERFORMANCE OF HIGH DISPERSED GOLD-SUPPORTED CATALYSTS FOR HYDROCHLORINATION OF ACETYLENE

Gold-supported catalysts for acetylene hydrochlorination were prepared with Au(en)2Cl3 as precursor and analyzed by the characterization methods of N2-adsorption,XRD and TEM.Effects of gold valence,support,Au loading and alkali metals on the catalytic performances of gold-supported catalysts were studied in detail at an atmospheric fixed bed reactor.The results indicated that the active constituents of gold-supported catalysts for hydrochlorination of acetylene were ionic Aun+.With activated carbon derived from coconut shell(ACS) as the support,KCl as the promoter and Au loading of 1%,gold-supported catalyst Au-K/ACS was of high dispersity and high catalytic activity for acetylene hydrochlorination.Under the reaction conditions of temperature 180℃,total gas hourly space velocity(GHSV) 240 h-1,feed volume ratio V(HCl)/V(C2H2)=1.1,the conversion of acetylene was up to 98% and the selectivity to vinyl chloride was more than 99.5%.In addition,the stability of Au-K/ACS catalyst was still favorable,even the GHSV was up to 2000 h-1.