Influence of ceria modification on the properties of TiO2-SnO2 supporting V2O5 catalysts for selective catalytic reduction of NO by NH3

A series of V2O5-CeO2/TiO2-SnO2 catalysts were prepared with different CeO2 content to investigate the effect of Ce modification for selective catalytic reduction of NO by NH3. The obtained samples were characterized by BET, XRD, HRTEM, H-2-TPR and FT-IR. The catalytic test was also investigated on a fixed bed reactor under the condition of simulated composition of flue gas. The results revealed that the V2O5-CeO2/TiO2-SnO2 catalyst with 10% CeO2 content (i.e. the molar ratio of Ce to Ti) showed the highest catalytic activity within the wide temperature range of 290 degrees C to 430 degrees C, even higher than V2O5-10wt. % WO3/TiO2-SnO2. Larger BET specific surface area and average pore volume, better dispersion of CeO2 on support and lower degree of crystallinity would enhance the performance of selective catalytic reduction. Furthermore, Ce modifier could strengthen redox properties of catalysts, which was beneficial for decreasing reduction temperature. Finally, FT-IR demonstrated that significant amounts of Lewis and Bronsted acidity also contributed to the catalytic reaction process.