Abstract
The activities of copper oxide supported on CeO 2, γ-Al 2O 3 and ceria-modified γ-Al 2O 3 catalysts for the NO+CO reaction at low temperature (200°C) have been investigated. The results show that the activities of the surface-dispersed copper species are greatly enhanced due to the presence of ceria, whether it was used as a support or as the pre-dispersed species on γ-Al 2O 3. The activities decrease in the order: CuO/CeO 2>CuO/CeO 2/γ-Al 2O 3>CuO/γ-Al 2O 3. For the CuO/CeO 2/γ-Al 2O 3 catalysts, it is shown that NO conversions are not improved significantly with the increasing of CuO and/or ceria loadings, however, the turn-over number for the catalysts is found to be strongly relative to ceria loadings. By a combination of X-ray diffraction (XRD), electron spin resonance (ESR) and temperature programmed reduction (TPR) results, the states and properties of copper oxide species, as well as the interactions among the surface-dispersed copper oxide species, ceria species and support, are also studied. All the results are tentatively discussed according to the incorporation model proposed previously.
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