Tin-sulfur based catalysts for acetylene hydrochlorination.

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