CO oxidation over CuO catalysts supported on CeO2-ZrO2 prepared by microwave-assisted co-precipitation: The influence of CuO content

CeO2-ZrO2 mixed oxide (Ce0.6Zr0.4O2) prepared by microwave-assisted heating co-precipitation was used as a support to prepare a series of CuO/Ce0.6Zr0.4O2 catalysts with various CuO contents (0 wt.%–15 wt.%) via the method of incipient-wetness impregnation. The obtained CuO/Ce0.6Zr0.4O2 samples were characterized by N2 adsorption, XRD, Raman, TEM and H2-TPR technologies, and their catalytic activities for CO oxidation were investigated. The results showed that the activity of CuO/Ce0.6Zr0.4O2 catalyst was strongly influenced by the content of CuO, and the catalyst with 10 wt.% CuO exhibited the best catalytic activity in CO oxidation, which could be attributed to the high dispersion and reducibility of CuO, and high oxygen vacancy concentration in the catalyst.