Reaction of NO + CO over Ce-Modified Cu–FeOx Catalysts at Low Temperature

A series of Ce-modified Cu–FeOx catalysts were synthesized with a sol–gel hydrothermal method. These catalysts contained different molar ratios of Ce, Cu, and Fe, and were applied to the process of NO catalytic removal by CO (CO-deNO). The physical and chemical parameters of the samples were characterized by XRD, XPS, ESR, H2-TPR, NO-TPO, and NO-TPD techniques. Moreover, the CO-deNO mechanisms for the representative catalysts were investigated by in situ DRIFTS. The SO2 and H2O resistances, and their corresponding mechanisms, were also systematically investigated. The catalytic activity testing shows that the optimized molar ratio of Cu, Ce, and Fe is 1:0.5:1.5. At this ratio, the CO-deNO efficiency is highest, but the N2O selectivity is also relatively high. Increasing the Fe percentage could reduce the N2O concentration. The characterization indicates that, at the optimized ratio, the interaction between Fe and Cu is at its strongest, which could increase the formation probability of surface synergistic...