焙烧条件对Co3O4/CeO2催化剂用于选择性氧化脱除CO性能的影响

he Co3O4/CeO2 performances for CO preferential oxidation in excess H2 were investigated, which was prepared by the glycine-nitrate combustion method and corprecipitation method. Meanwhile, The effect of calcination condition on the physicochemical properties of catalysts were studied by N2 adsorption-desorption, Scanning electron microscope, X-ray diffraction, and temperature-programmed reduction. The results indicated that the 30wt% Co3O4/CeO2 catalyst prepared by glycine-nitrate combustion method calcination at 400 ℃ for 2h has better catalytic activity for CO preferential oxidation, and CO could be completely eliminated at 150 ℃. The XRD, SEM, TG and BET suggest that catalyst was decomposed to form Co3O4 at the surface of the catalyst and played a key role in catalyst performace during the reaction at proper temperature. Under higher calcination temperatures and time, the catalyst severe sintering of Co3O4 and facilitated the formation of spinel phase, which led to a significant decrease in performance.