Enhanced catalytic performance of V₂O₅–WO₃/Fe₂O₃/TiO₂microspheres for selective catalytic reduction of NO by NH₃

Abstract

The V2O5–WO3/Fe2O3/TiO2 microsphere catalysts were prepared by an impregnation method. The catalytic test results showed that the Fe2O3 additives in V2O5–WO3/Fe2O3/TiO2 improved the NO decomposition in the temperature range of 200–400 °C. The characterization results indicated that the iron oxides mainly existed in the form of Fe2O3, which was beneficial for the oxidation of NO to NO2. Meanwhile, the superior catalytic performance of V2O5–WO3/Fe2O3/TiO2 for the selective catalytic reduction of NO has been attributed to its highly dispersed active species, and lots of surface adsorbed oxygen. Prominently, the activity of V2O5–WO3/Fe2O3/TiO2 microspheres can be recovered after cutting off SO2, and thus these combination metal oxide catalysts show not only high catalytic activities but also good resistance to SO2.