Acid modified carrier on catalytic oxidation of dichloromethane over CeO2/HZSM-5 catalysts

Abstract In this study, a series of HZSM-5-X were prepared by acid modification, then Ce/HZSM-5-X (X = 0, 0.2, 0.4, 1.0, 2.0) were prepared by impregnation method. The catalytic performance of the catalysts on dichloromethane (DCM) oxidation was investigated. Through different characterizations, HZSM-5-X exhibit higher specific surface area, better redox ability, richer acidity and more suitable acidic site distribution after acid treatment. Among them, Ce/HZSM-5-0.4 shows better catalytic activity with the lowest by-product and the best CO2 yield, its T90 is 302 °C and the CO2 yield of T90 more than 80 wt%, which demonstrates that the acid modification of carrier plays the positive effect on the catalyst capacity for DCM oxidation.