Promoting NH3-SCR denitration via CO oxidation over CuO promoted V2O5-WO3/TiO2 catalysts under oxygen-rich conditions

Abstract

Ammonia selective catalytic reduction (NH3-SCR) technique for nitrogen oxide (NOx) elimination of low temperature flue gas (<200 °C) requires huge energy consumption and operation costs. In this work, a CuO modified V2O5-WO3/TiO2 (Cu/VWTi) catalyst are constructed to achieve the aim of enhancing the temperature of flue gas via using the heat released by CO oxidation, thereby promoting the NH3-SCR of NOx reaction. Benefiting from the synergistic effect between CuO and VWTi in the adsorption and activation of reactants, Cu/VWTi catalyst shows high NOx (>90%) and CO (>90%) removal efficiency at the temperature range of 225–270 °C and a GHSV of 40,000 h−1. Moreover, it is found that the completely oxidation of 2000 ppm CO can increase the flue gas temperature by about 20 °C. Therefore, developing catalyst that can achieve simultaneously NH3-SCR of NOx and CO oxidation is a feasible method to deduce the energy consumption and operation costs of NH3-SCR of NOx system in low temperature flue gas. Finally, the reaction process and SO2 deactivation effect over Cu/VWTi catalyst was studied via in-situ DRIFT. This work might provide some guidance for the design of catalysts to eliminate multiple pollutants.