Bimetallic Au–Ni/CSs catalysts for acetylene hydrochlorination

Abstract

Gold and gold-based bimetallic catalysts for acetylene hydrochlorination were prepared with HAuCl₄·4H₂O and NiCl₂·6H₂O as precursors, and were analyzed with BET, TG, XRD, TEM, TPR, and XPS. The Au1Ni3/CSs catalyst shows both high activity and good stability, with a C₂H₂ conversion of 95.4% after 46 h under a gas hourly space velocity (GHSV) of C₂H₂ of 900 h⁻¹. The results indicate that the addition of nickel to gold can inhibit the reduction of catalytically active Au³⁺ to Au⁰ and oxidize Au⁰ to Au⁺ during the preparation of Au-based/CSs catalysts, and weaken the occurrence of coke deposition on the catalyst surface, thus improving the stability of the catalyst.