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用常规浸渍法和双浸渍法制备了系列ＭｇＯ／γ－Ａｌ２Ｏ３复合氧化物载体负载的钯催化剂．实验结果发现，两种制备方法所得催化剂中，钯在复合载体上沉积的部位不同，从而导致了不同的钯与载体的相互作用，使得活性金属钯的电子密度发生不同程度的变化．钯催化剂对ＣＯ氧化反应活性不仅与钯分散度有关，而且还与催化剂中活泼的晶格氧及钯与载体作用方式有关．钯催化剂随载体中ＭｇＯ含量的变化而呈现的活性变化趋势是以上各因素协同作用的结果．
A series of supported MgO / γ-Al2O3 composite oxide supported palladium catalysts were prepared by conventional impregnation and double impregnation methods. The experimental results show that the palladium deposited on the composite support is different in the catalysts obtained by the two preparation methods, leading to the interaction between different palladium and the support, and varying the electron density of the active metal palladium. The catalytic activity of palladium on the oxidation of CO is not only related to the dispersion of palladium, but also to the active lattice oxygen and palladium in the catalyst. The change trend of the activity of the palladium catalyst with the change of the MgO content in the carrier is the result of the synergistic effect of the above factors.