Synergies of redox ability and acidity over RuMn/ZSM-5 for catalytic elimination of 1,2-dichloroethane

Abstract

Ru-Mn bimetallic catalyst supported on HZSM-5 was prepared by impregnation method for catalytic oxidation of 1, 2-dichloroethane (1, 2-DCE). The 0.1Ru1Mn/ZSM-5 catalyst exhibited the lowest T90 of 241 °C and the highest yields of HCl (75%) and CO2 (57%). The products contained a small amount of dichloroethylene, trichloroethylene, and tetrachloroethylene, with a total yield of <5%. By the characterizations of various instruments, it was found that 0.1Ru1Mn/ZSM-5 exhibited the best catalytic activity because of its rich acidity, high redox property, and highly dispersed Ru and Mn nanoparticles on the surface of HZSM-5. Furthermore, due to the synergies of Ru-Mn bimetal and redox ability-acidity, 0.1Ru1Mn/ZSM-5 exhibited excellent chlorine resistance ability and good catalytic activity during long-term test. The reaction mechanism of catalytic oxidation of 1, 2-DCE was investigated using in situ DRIFTS and GC–MS techniques. Vinyl alcohol was the vital intermediates for 1, 2-DCE oxidation to CO2 and H2O. The double synergistic strategy can provide a reference for designing catalysts to remove chlorinated volatile organic compounds.