Abstract
The influence of Ce/Zr ratios in the cerium-rich region on the dispersibility and reduction property of Cu catalysts supported on ceria–zirconia composite oxides was investigated. In the catalysts, the dispersibility of copper oxide species on ceria–zirconia supports was different depending on Ce/Zr ratio. The particle size of copper oxide species on Ce0.7Zr0.3O2 was smaller than that on Ce0.5Zr0.5O2. CO oxidation activity of 1.0 wt % Cu/Ce0.7Zr0.3O2 was higher than that of 1.0 wt % Cu/Ce0.5Zr0.5O2. Temperature programmed reduction by CO (CO-TPR) measurement revealed that the reducibility of Cu/Ce0.7Zr0.3O2 was higher than that of Cu/Ce0.5Zr0.5O2. The temperature of the first peak in CO-TPR profiles for both catalysts was in good agreement with the temperature at which the conversion of CO reached 50% (T50). It is suggested that the copper oxide species — ceria–zirconia interaction influences the activation of oxygen at the interface between copper oxide species and ceria–zirconia, resulting in different catalytic performance for CO oxidation.
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