Characterization and performance of V2Os/CeO2 for NH3-SCR of NO at low temperatures

A series of CeO2 supported V205 catalysts with various loadings were prepared with different calcination temperatures by the incipient impregnation. The catalysts were evaluated for low temperature selective catalytic reduction （SCR） of NO with ammonia （NH3）. The effects of 02 and SO2 on catalytic activity were also studied. The catalysts were characterized by specific surface areas （SBET） and X-ray diffraction （XRD） methods. The experimental results showed that NO conversion changed significantly with the different V205 loading and calcination temperature. With the V205 loading increasing from 0 to 10wt%, NO conversion increased significantly, but decreased at higher loading. The optimum calcination temperature was 400℃. The best catalyst yielded above 80% NO conversion in the reaction temperature range of 160℃-300℃. The formation of CeVO4 on the surface of catalysts caused the decrease of redox ability.