In Situ Growth of Vanadium Oxide on Reduced Graphene Oxide for the Low-Temperature NO-SCR by NH₃

Abstract

The vanadium oxide/reduced graphene oxide (V₂O₅/rGO) composite catalyst which determined the selective catalytic reduction activity (SCR) of NO with NH₃ was prepared by a simple solvothermal method. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman, X-ray energy spectrometer (XPS) and N₂ sorption isotherm measurement (BET). Results of NH₃-SCR showed that the NO conversion of V₂O₅/rGO catalyst could reach 54.3% at 100 °C. And the removal of NO increased to 74.6% when the temperature was up to 220 °C. By characterizing the microstructure and morphology of the V₂O₅/rGO catalysts prepared by in-situ growth and mechanical mixing methods, it was further shown that V₂O₅ nanoparticles were highly dispersed and in situ growth on the rGO surface. Based on X-ray energy spectrometer, V₂O₅/rGO catalyst had good low temperature denitrification performance due to the chemical adsorption oxygen and low-valent vanadium oxide contained in V₂O₅/rGO catalyst, which was beneficial to the redox reaction between V₂O₅ and graphene.

Keywords

V₂O₅/rGO catalyst / NH₃-SCR / graphene / in situ growth