Metal doped sulfated ZrO2 as catalyst for the selective catalytic reduction (SCR) of NO with propane

The selective catalytic reduction of nitric oxide with propane was studied using metal oxide (Pt, Mn, Fe, Ni, Cu, Ga) loaded sulfated zirconia as catalysts under lean conditions at reaction temperatures between 300 and 600°C. Pure and sulfated zirconia showed only a low activity for selective catalytic reduction (SCR) with propane. After loading sulfated zirconia with Cu and especially Ga oxide, a high catalytic activity with NO conversion of 80% in the case of the Ga loading was achieved. The selectivities towards the main product of the SCR product N2 were very promising. The catalytic activity only slightly decreased upon introduction of SO2 into the reaction mixture.