Improving synergistic catalysis of CuOx/AgOy/TiO2 for promoting selective catalytic oxidation of ammonia

Selective catalytic oxidation of ammonia (NH 3 -SCO) is considered an efficient and environmentally friendly technology to remove trace ammonia pollutants. The Cu-based and Ag-based catalysts have been taken as among the most promising choices for NH 3 -SCO. However, the insufficient NH 3 catalytic activity of Cu-based catalysts and poor N 2 selectivity of Ag-based catalysts restrict their commercial applications. Herein, we report a facile stepwise induced loading method to obtain anatase titania-supported Cu-Ag composite catalysts with well Cu-Ag nanoparticles dispersion and interaction. The enhanced dispersion of Cu-Ag nanoparticles promotes their interaction with TiO 2 support, improves the stability and reducibility of active sites, and finally leads to appropriate chemical states and synergy of the Cu-Ag complex active sites for improving NH 3 conversion and N 2 selectivity. The as-designed CuO x /AgO y /TiO 2 shows outstanding NH 3 -SCO low-temperature catalytic performance with a (>)99 % NH 3 conversion and 83 % N 2 selectivity under 12000 mL g -1 h −1 at 175 °C as well as satisfied long-term stability.