Enhanced catalytic performance of V2O5–WO3/Fe2O3/TiO2 microspheres 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.