V2O5/hematite catalyst for low temperature selective catalytic reduction of NOx with NH3

A series of V2O5/hematite (V/H) catalysts were prepared by impregnation of goethite with NH4VO3 solution and used in the selective catalytic reduction (SCR) of NO with NH3. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption, H2 temperature-programmed reduction, and NH3 temperature-programmed desorption. The effects of V2O5 loading and calcination temperature on the SCR activity were investigated. The NO conversion over 3% V/H catalysts calcined at 300 °C exceeded 95% at 250–300 °C. Neither H2O nor SO2 (0.01%) had any adverse impact on the activity, but a decrease of SCR activity was observed after high concentrations (0.03% and 0.05%) of SO2 were introduced. Cutting off the SO2 supply resulted in activity restoration. The simultaneous addition of 5% H2O and 0.03% SO2 led to a synergistic poisoning effect, but when these gases were switched off, the activity was recovered. SO2 adsorption on the catalyst surface led to the decrease in SCR activity.

Graphical AbstractA series of highly dispensed V2O5/hematite (V/H) catalysts were prepared by the impregnation of V2O5 on goethite, which were highly efficient for the selective catalytic reduction of NO with NH3.Figure optionsDownload as PowerPoint slide