Abstract
Ce 0.5Zr 0.5O 2 solid solution was synthesized by a microwave method and used as support for preparing a series of CuO/Ce 0.5Zr 0.5O 2 catalysts. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) and temperature-programmed reduction (TPR), and the results indicated that: (1) the dispersion capacity of copper oxide on Ce 0.5Zr 0.5O 2 is about 0.70 mmolCuO/100 m 2Ce 0.5Zr 0.5O 2; (2) there are two kinds of copper species in the catalysts, i.e., dispersed and crystalline copper species. The catalytic activities of CuO/Ce 0.5Zr 0.5O 2 for the low temperature (100 and 125 °C) CO oxidation were also tested, which showed that the sample with CuO loading amount of 1.2 mmolCuO/100 m 2Ce 0.5Zr 0.5O 2 presented the highest activity. Combined with the XRD and TPR results, it seems to suggest that the main active species in this system should be the surface and/or small particle copper oxide species.
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