Stabilizing supported gold catalysts in acetylene hydrochlorination by constructing an acetylene–deficient reaction phase

• Published in: Green energy & environment 2021-02, Vol.6 (1), p.9-14
• Main Authors: Wang, Bolin, Yue, Yuxue, Wang, Saisai, Shao, Shujuan, Chen, Zhi, Fang, Xianhua, Pang, Xiangxue, Pan, Zhiyan, Zhao, Jia, Li, Xiaonian
• Format: Article
• Language: English
• Subjects: Acetylene hydrochlorination; Acetylene-deficient; Reaction phase; Supported Au catalysts
• ISSN: 2468-0257; 2468-0257
• DOI: 10.1016/j.gee.2020.06.012

In the process of acetylene hydrochlorination, the rapid deactivation of supported gold (Au) catalysts by acetylene is still a huge challenge. Here, we provide an innovative strategy for constructing an acetylene–deficient reaction phase on the active site by coating an ionic liquid film on the Au(H2O)/C surface. The reactant ratio of C2H2 to HCl in this acetylene–deficient reaction phase is 1:132, in contrast to the 1:1 M ratio in the gas phase, thus boosting the catalytic stability of Au(H2O)/C catalysts. The kinetic and theoretical analysis showed that the reduction of cationic gold by C2H2 and the generation of carbon deposition can be inhibited in this constructed reaction phase during reaction. The current work not only broadens the scope of supported Au catalysts in acetylene hydrochlorination, but also verifies the perspective of the tunability of stoichiometric balance, which can be used in other catalytic applications. We have proposed a new strategy for constructing an C2H2-deficient reaction phase around the active site by coating an IL film on the surface of Au(H2O)/C, leading to great improvement in the catalytic stability of Au(H2O)/C catalyst. Our work provides a universal method for tuning the stoichiometric balance of reactants. [Display omitted]