Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (2): 334-346.DOI: 10.1016/S1872-2067(20)63617-8

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Acetylene hydrochlorination over supported ionic liquid phase (SILP) gold-based catalyst: Stabilization of cationic Au species via chemical activation of hydrogen chloride and corresponding mechanisms

Jia Zhaoa,*(), Saisai Wanga, Bolin Wanga,b, Yuxue Yuea, Chunxiao Jina, Jinyue Lua, Zheng Fanga, Xiangxue Panga, Feng Fenga, Lingling Guoa, Zhiyan Panb, Xiaonian Lia,#()   

  1. aIndustrial Catalysis Institute of Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    bDepartment of Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2020-03-21 Accepted:2020-05-10 Online:2021-02-18 Published:2021-01-21
  • Contact: Jia Zhao,Xiaonian Li
  • About author:#Tel: +86-571-88320002; E-mail: xnli@zjut.edu.cn
    *Tel: +86-571-88871656; E-mail: jiazhao@zjut.edu.cn;
  • Supported by:
    National Natural Science Foundation of China(21606199);Science and Technology Department of Zhejiang Province is gratefully acknowledged(LGG20B060004)

Abstract:

The activation of HCl by cationic Au in the presence of C2H2 is important for the construction of active Au sites and in acetylene hydrochlorination. Here, we report a strategy for activating HCl by the Au-based supported ionic liquid phase (Au-SILP) technology with the [N(CN)2-] anion. This strategy enables HCl to accept electrons from [N(CN)2-] anions in Au-[N(CN)2-] complexes rather than from pure [Bmim][N(CN)2], leading to notable improvement in both the reaction path and the stability of the catalyst without changing the reaction triggered by acetylene adsorption. Furthermore, the induction period of the Au-SILP catalyst was shown to be absent in the reaction process due to the high Au(III) content in the Au(III)/Au(I) site and the high substrate diffusion rate in the ionic liquid layer. This work provides a facile method to improve the stability of Au-based catalysts for acetylene hydrochlorination.

Key words: Acetylene hydrochlorination, Electron density, Hydrogen chloride activation, Stabilization mechanism, Gold-based supported ionic liquid, phase catalyst