采用 XPS手段对钙钛矿型 La Mn O3-δ及 L a1- x Srx Mn O3-δ纳米粒子进行了表征 ,结果显示 ,随L a Mn O3-δ纳米粒子粒径减小 ,其表面氧空位浓度增加 ,表面化学吸附氧性质发生变化 ,同时单位质量试样上化学吸附氧含量增加 ,这些导致化学吸附氧反应活性提高 ,使 CO氧化的起始反应温度降低和一定温度下单位质量催化剂上 CO氧化速率提高。 La Mn O3-δ中的镧被锶部分取代后表面氧空位浓度显著提高 ,表面有 Mn3+ 和 Mn4 + 共同存在 ,CO氧化的催化活性也明显提高。 XPS was used to characterize the perovskite type La Mn O3-δand L a1-x Srx Mn O3-δnanoparticles. The results showed that with the reduction of the particle size of the L a Mn O3-δnanoparticles, the surface oxygen vacancies As the concentration increases, the surface chemisorption oxygen changes, and the amount of chemisorbed oxygen increases per unit mass of the sample, which results in an increase in the chemisorbed oxygen reactivity, a decrease in the initial reaction temperature for CO oxidation, and a decrease in CO on the unit mass of catalyst at a given temperature The rate of oxidation is increased. The lanthanum partially substituted by strontium in La Mn O3-δ obviously increases the oxygen vacancies on the surface, with the coexistence of Mn3 + and Mn4 + on the surface and the catalytic activity of CO oxidation.