Comparative study on sulfur poisoning of V2O5-Sb2O3/TiO2 and V2O5-WO3/TiO2 monolithic catalysts for low-temperature NH3-SCR

The V2O5-Sb2O3/TiO2 monolithic catalyst prepared by an impregnation method showed superior deNOx performance compared with the commercial V2O5-WO3/TiO2 catalyst in the presence of sulfur dioxide. In addition, it exhibited remarkable sulfur resistance at 250°C for 30h test due to the low deposition of NH4HSO4, suggested by the TG and MS results. The lower SO2 oxidation and higher reactivity of NH4HSO4 with NO are the key factors for the low deposition of NH4HSO4 over this Sb-modified monolithic catalyst.