Redox property of Co3O4/CeO2 and the effect of reaction conditions on its performance in CO oxidation
Co3O4/CeO2的氧化还原性能及反应条件对其CO氧化活性的影响

Co3O4/CeO2 catalysts were prepared by co-precipitation-oxidation method and characterized by using X-ray diffraction(XRD),surface area(SBET) measurement and temperature-programmed reduction(TPR).The effect of cobalt content in Co3O4/CeO2 on its physical properties and catalytic performance in CO oxidation was investigated under both the humid and dry conditions.The results indicated that the Co3O4/CeO2 composite with a Co/Ce atomic ratio of 9(calcined at 723 K) exhibits much smaller particle size and higher surface area than pure Co3O4;the addition of cerium to Co3O4 is beneficial to obtain Co3O4 with small particle size.The average particle size and BET surface area of Co3O4 in the Co3O4/CeO2 composite(Co/Ce atomic ratio = 9) calcined at 538 K are 7.2 nm and 167.6 m2/g,respectively.Accordingly,the Co3O4/CeO2 composite exhibits excellent redox property.