Abstract: The gold-based catalysts of mono-component AuCl₃/AC and bi-component AuCl₃-BiCl₃/AC were prepared by impregnation. The gold-based catalysts evaluated for acetylene hydrochlorinationunder the reaction temperature of 170℃,volume space velocity of C₂H₂of 30h^-1,φ(HCl)/φ(C₂H₂)=1.1. The results showed that among mono-component catalysts,the catalystof 1.0% AuCl₃/AC exhibited relatively superior catalytic performance,with over 98.5% of the conversion of acetylene after 8 h ofreaction,even after 120 h of reaction, the conversion remained above 70%, and the selectivity to vinyl chloride monomer were consistently above 99%. Among bi-component catalysts, the catalyst of 1.0%AuCl₃-1.0%BiCl₃/AC demonstrated more outstanding catalytic performance, the conversion remained above 99% after 260 h,and the vinyl chloride selectivity were consistently 100%, this catalyst had superior activityand stability than the conventional mercuric chloride catalyst. Through analysis,it is found catalystsof AuCl₃/AC reveals that decay of activity of catalystsare due to reduction of Au³⁺and clustering of the gold component; The catalytic performance of AuCl₃-BiCl₃/AC catalysts enhances significantly due to introduction of BiCl₃ as the stabilizing component which suppresses above changes.

Key words: AuCl₃/AC catalyst, AuCl₃-BiCl₃/AC catalyst, acetylene, hydrochlorination