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.