Balancing acetylene and hydrogen chloride adsorption through gold‐copper‐nickel synergistic interactions for enhanced acetylene hydrochlorination

Abstract Metal promoters enhancing Au catalysts present a promising alternative to toxic mercury chloride. However, achieving an optimal balance between the synergistic benefits of metal promoters and challenges like coke formation remains a significant hurdle. Herein, a low‐loading Au catalyst (0.15 wt.%), synergistically modulated by copper and nickel (designated as AuCu 16 Ni/AC), was developed. The AuCu 16 Ni/AC catalyst exhibits a dynamic restructuring mechanism and synergistic effects, enabling balanced adsorption of acetylene (C 2 H 2 ) and hydrogen chloride. This enhances catalytic efficiency, effectively suppresses coke formation, and significantly improves catalyst stability. As a result, the AuCu 16 Ni/AC catalyst achieves outstanding performance, with a high C 2 H 2 conversion rate of 93.03% under C 2 H 2 gas hourly space velocity conditions of 540 h −1 and a remarkably low deactivation rate of 0.12% h −1 . This work provides a low‐loading, highly stable catalyst with promising industrial applicability while offering novel insights and a theoretical basis for the design of multi‐component catalysts.