Tin-sulfur based catalysts for acetylene hydrochlorination

Authors: YIBO WU, FUXIANG LI, XIAOQIANG LUO, GANG TIAN, YUNXIAO FENG, YONGJUN HAN, LI WANG, SONGMAO CHU, YUNLI CAO, KESHENG CAO, XIAOMING HU, XUEJUN SHI, SONGTIAN LI, GUOXV HE, QINGBIN LI

Abstract: In the present work, tin-sulfur based catalysts were prepared using Na₂SO₃ and (CH₃SO₃)₂Sn and were tested in acetylene hydrochlorination. Based on the analysis of experiments results, the acetylene conversion of (CH₃SO₃)₂Sn/S@AC is still over 90% after a 50 h reaction, at the reaction conditions of T = 200 ^oC, V_HCl/V_C2H2 = 1.1:1.0 and C₂H₂-GSHV = 15 h^-1. According to the results of X-ray photoelectron spectroscopy (XPS), HCl adsorption experiments, and acetylene temperature programmed desorption (C₂H₂-TPD), it is reasonable to conclude that the interaction between Sn and S not only can retard the oxidation of Sn²⁺ in catalysts but also strengthen the reactant adsorption capacity of tin-based catalysts. Furthermore, results obtained from nitrogen adsorption/desorption and XPS proved that the CH₃SO₃- can effectively decrease the coke deposition of (CH₃SO₃)₂Sn/AC and thus prolong the lifetime of (CH₃SO₃)₂Sn/AC.

Keywords: Sulfur, tin-based catalysts, acetylene hydrochlorination

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