Low temperature catalytic hydrolysis of carbon disulfide over nano-active carbon based catalysts prepared by liquid phase deposition

摘要

In this work, a series of nano-carbon based catalysts loaded with metal oxides were prepared via liquid phase deposition, and used for low temperature catalytic hydrolysis of carbon disulfide (CS2). The influences of preparation conditions for catalytic activity were investigated. These factors included species and content of metal oxides, ratio of F : Fe, solution pH, and calcination temperature. The results showed that catalysts with 0.2 mol L-1 Fe ion after calcining at 500 degrees C had good catalytic activity for the catalytic hydrolysis of CS2. Furthermore, the catalytic hydrolysis activity could reach the best performance with the optimum preparation conditions with an F : Fe ratio of 3 : 1, and a solution pH of 5.1. The metal species affected the catalytic hydrolysis of CS2 and the oxidation of H2S. The solution pH and fluoride affected the generation of Fe3+ (Fe2O3). The chemical composition, structure and surface properties were characterized by X-ray diffractometry (XRD), temperature programmed desorption of carbon monoxide (CO-TPD), X-ray photoelectron spectrum (XPS) and Brunauer-Emmett-Teller measurements (BET). The XRD and BET results showed that the calcination temperature controlled the crystalline phase and generation of Fe2O3 and affected the properties of specific surface area and pore structure.