CO oxidation on CeXZr1−XO2-supported CuO catalysts: Correlation between activity and support composition

Catalytic system formed by CuO supported on six commercial CeXZr1−XO2 mixed oxides with Cu loading of 7 wt.% has been prepared by conventional wetness impregnation method. These catalysts have been screened for CO oxidation and characterized by means of XRD, BET, Raman and temperature programmed experiments. Activity in CO oxidation has been discussed and correlated with redox properties of catalysts. Below 175 °C the catalysts reducibility correlates with ceria content in the support, although an increase of Zr content in the support increases considerably the reduction degree of the ceria-containing supports up to 600 °C. Activity in CO oxidation correlates with Ce/Cu molar ratio, which resulted in a linear correlation between preexponential factor and surface Ce/Cu ratio. A compensation effect was found for ceria-containing catalysts.

Figure optionsDownload high-quality image (60 K)Download as PowerPoint slideResearch highlights▶ CO oxidation activity correlates with Ce/Cu mol ratio. ▶ CO oxidation activity correlates with catalyst reducibility at low temperature. ▶ Low temperature reduction of catalysts corresponds to highly disperse copper species. ▶ Compensation effect exists for ceria-containing catalysts.