Novel development of VOx–CeOx–WOx/TiO2 catalyst for low-temperature catalytic oxidation of chloroaromatic organics

摘要

Abstract A novel selective catalytic reduction (SCR) catalyst with high catalytic activity on chloroaromatic organics at lower temperatures (160–180?℃) is critical for municipal solid waste incineration (MSWI) plants. This study prepares a series of honeycomb-type VOx/TiO2 catalysts and finally develops a new low-temperature catalyst with high catalytic activity in eliminating chloroaromatic organics. Based on the conversion efficiency (CE) of 1,2-dichlorobenzene (1,2-DCB) and CO2 selectivity, the optimal VOx content of 4.06% (in weight)?in VOx/TiO2 catalyst is first confirmed. By modifying CeOx and WOx, a novel honeycomb-type catalyst of VOx–CeOx–WOx/TiO2 achieves the highest CE (93.1%–93.6%) and CO2 selectivity (40.9%–60.7%) at 150–200?℃. It was found that the CeOx and WOx can improve the catalytic activity by enriching the surface content of V and O, increasing the proportion of V5+ and Osurf, enlarging the supply source of reactive oxygen species and their storage capacity, and accelerating the redox cycle of VOx, CeOx, WOx, and reactive oxygen species. This study can guide the development of monolithic low-temperature catalysts with high catalytic activity in eliminating chloroaromatic organics in MSWI?flue gas.