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In this work, the activity of xCuO-Ce0.9Zr0.1O2 catalysts for the reaction of NO + CO was investigated. Especially, in situ DRIFTS was applied to investigate the surface species under the adsorption of NO and/or CO and the reaction of NO and CO to understand the key intermediates species and reaction process of NO + CO. The results suggest that the copper oxide species are well dispersed on the surface of the catalysts, which can be easily reduced to form Cu+ species. The Cu+ species are proposed to be important activity species. The results of this work also suggest that N2O22− is likely an intermediate species that plays an important role in NO reduction by CO. Thus, more Cu+ and highly dispersed copper oxide species are expected to be beneficial for the reaction of CO + NO over the xCuO-Ce0.9Zr0.1O2 catalysts.

Effect of Surface Copper Species on NO + CO Reaction over xCuO-Ce0.9Zr0.1O2 Catalysts: In Situ DRIFTS Studies