V_2O_5/CeO_2 catalysts for low temperature NH_3-SCR

A series of CeO2 supported V2O5 catalysts were prepared by incipient impregnation for low temperature selective catalytic reduction(SCR) of NOx with ammonia(NH3).The effects of V2O5 loading of catalysts and calcination temperature on the catalytic activity were investigated.A combination of various physicochemical techniques such as SEM,BET surface area and X-ray diffraction(XRD) were used to characterize the catalysts.The experimental results showed that the V2O5/CeO2 catalysts had high activity,but V2O5 loading and catalytic activity had no linear relationship.NO conversion increased significantly when the V2O5 loading was from 0 to 10%,but decreased at higher loading.As calcination temperature increased,catalytic activity decreased by the formation of CeVO4.The best calcination temperature was 400℃.