Constructing Dual Active Sites by Cu Modification of WO₃/CeO₂ with Activated Surface Lattice Oxygen for Simultaneous Catalysis of NH₃-SCR and CO Oxidation

Simultaneous reactions of selective catalytic reduction of NOx with NH3 (NH3-SCR) and CO oxidation remain challenging on a single catalyst. Constructing dual active sites is an efficient strategy for developing heterogeneous catalysts aiming for simultaneous reactions. Herein, we developed a dual-active-site system through the copper modification of a cerium–tungsten composite. In this catalytic system, the Cu species served as the active sites for CO oxidation, and the Ce–O–W domains facilitated the SCR reaction. Due to the synergistic cooperation between the Cu species and W/Ce components in the reactant adsorption and activation, the optimized 3.9 wt % CuOx/WO3/CeO2 catalyst achieved over 90% removal efficiency for both NOx and CO between 225 to 325 °C. Crucially, CO was found to activate the surface lattice oxygen, effectively mitigating the mutual inhibition between the NH3-SCR and CO oxidation reactions, which is prevalent when operating concurrently on a single catalyst. This dual-site design strategy, which tailors the active centers to specific reactants with minimized inhibition, provides a universal approach for the coprocessing of NH3-SCR and CO oxidation, advancing the synergistic control of multicomponent flue gas pollutants.