The catalytic activity for CO oxidation of CuO supported on Ce0.8Zr0.2O2 prepared via citrate method

CuO/Ce0.8Zr0.2O2 catalysts were prepared by citrate method and used for carbon monoxide oxidation. The samples were characterized by XRD, XPS, BET and ICP-AES techniques. The catalytic properties of the catalysts were studied by using a microreactor-GC system. XRD analysis showed Ce0.8Zr0.2O2 was cubic, fluorite structure for all the catalysts. The XPS indicated the valence of Ce atom was +4 and there were reduced copper species presented in the CuO/Ce0.8Zr0.2O2 catalyst. The results showed that the CuO loadings, calcination temperature and calcination time affected the catalytic activity of the catalysts for low-temperature CO oxidation. For comparison, the catalytic activities of CuO/CeO2 catalysts calcined at different temperatures were also studied. The results indicated that CuO/Ce0.8Zr0.2O2 catalyst had better thermal resistance than CuO/CeO2 catalyst and had inferior activity than the CuO/CeO2 catalyst when they were both calcined at 600 °C.