Citation: Xiao-Long Xu, Jia Zhao, Chun-Shan Lu, Tong-Tong Zhang, Xiao-Xia Di, Shan-Chuan Gu, Xiao-Nian Li. Improvement of the stability of Hg/AC catalysts by CsCl for the high-temperature hydrochlorination of acetylene[J]. Chinese Chemical Letters, ;2016, 27(6): 822-826. doi: 10.1016/j.cclet.2016.01.014 shu

Improvement of the stability of Hg/AC catalysts by CsCl for the high-temperature hydrochlorination of acetylene

Institute of Industrial Catalysis of Zhejiang University of Technology, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Hangzhou 310032, China

Received Date: 2 December 2015
Revised Date: 27 December 2015

Activated carbon-supported mercuric chloride (HgCl₂) is used as an industrial catalyst for acetylene hydrochlorination. However, the characteristic of easy sublimation of HgCl₂ leads to the deactivation of the catalyst. Here, we showed that the thermal stability of the Hg/AC catalyst can be evidently improved when CsCl is added into the Hg/AC catalyst. Compared with the pure Hg/AC catalyst, the sublimation rate of HgCl₂ from the Hg-Cs/AC catalyst decreased significantly and the Hg-Cs/AC catalyst showed better catalytic activity and stability in the reaction. This promoting effect is related to the existence of cesium mercuric chlorides (Cs_xHg_yCl_x+2y) highlighted by XRD, HR-TEM and EDX analyses. Thus, reacting HgCl₂ with alkali chlorides to form alkali-mercuric chlorides may be a key to design highly efficient and thermally stable mercuric chloride catalyst for hydrochlorination reactions.
- Cesium chloride,
- Mercuric chloride,
- Sublimation,
- Hydrochlorination of acetylene,
- Cesium-mercuric chlorides
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