Tin-sulfur based catalysts for acetylene hydrochlorination

In the present work, tin-sulfur based catalysts were prepared using Na 2 SO 3 and (CH 3 SO 3 ) 2 Sn and were tested in acetylene hydrochlorination. Based on the analysis of experiments results, the acetylene conversion of (CH 3 SO 3 ) 2 Sn/S@AC is still over 90%after a 50 h reaction, at the reaction conditions of T = 200 o C, V HCl /V C2H2 = 1.1:1.0 and C 2 H 2 -GSHV = 15 h –1 . According to the results of X-ray photoelectron spectroscopy (XPS), HCl adsorption experiments, and acetylene temperature programmed desorption (C 2 H 2 -TPD), it is reasonable to conclude that the interaction between Sn and S not only can retard the oxidation of Sn 2+ 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 CH 3 SO 3 - can effectively decrease the coke deposition of (CH 3 SO 3 ) 2 Sn/AC and thus prolong the lifetime of (CH 3 SO 3 ) 2 Sn/AC.