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CeO2- and Ce0.63Zr0.37O2-supported noble metal catalysts were studied. Samples were fully characterized using TEM, XRD, N2 adsorption and H2 chemisorption. The oxygen storage process was investigated focusing on the evolution as a function of temperature of both the oxygen storage capacity (OSC) and the oxygen storage complete capacity (OSCC). Aging effect on OSC was also examined in details in the case of Rh catalysts. Finally, the major role of oxygen diffusion, partly influenced by the metal/support interface quality, was confirmed. 相似文献
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A total of 10 noble metal (Rh, Pt, Pd, Ru and Ir) catalysts, either supported on CeO2 or Ce0.63Zr0.37O2, were prepared. Catalysts were fully characterized using XRD, N2 adsorption at −196 °C, TEM and H2 chemisorption. Oxygen storage processes were carefully investigated. The influence of temperature was checked and a key role of oxygen diffusion was further demonstrated. A review of the reactions involved in the CO transient oxidation reaction is finally proposed. 相似文献
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