Surface species and oxygen vacancies were studied in MnO_x(0.4)-CeO₂ toward repeated soot oxidation. MnO_x(0.4)-CeO₂ catalysts prepared by the citric acid complex method were repeatedly used in a 10% O₂/Ar gas flow and showed favorable activity and satisfactory durability toward soot oxidation. X-ray diffraction (XRD), N₂ adsorption/desorption, Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and in situ visible/UV Raman characterization methods were utilized to investigate the structural features of fresh and reused catalysts. The irreversible conversion of high valence manganese species as well as the reduction of Frenkel-type oxygen vacancies and lattice oxygen could be clearly observed in the reused samples, which were associated with the slight deactivation. Spectators and participators were two existing forms of Frenkel-type oxygen vacancies. It was noteworthy that the participators almost fully regenerated after each reaction cycle, which ensured the ability to activate O_latt in repeated soot oxidation process. Therefore, the catalysts maintained favorable activity and satisfactory durability, which was mainly because the relatively stable level of participators.

在MnO _x（0.4）-CeO ₂中研究了表面物种和氧空位，以进行反复的烟灰氧化。通过柠檬酸络合法制备的MnO _x（0.4）-CeO ₂催化剂在10％O ₂ / Ar气流中重复使用，显示出良好的活性和令人满意的抗烟尘氧化性。X射线衍射（XRD），N ₂利用吸附/解吸，电子顺磁共振（EPR），X射线光电子能谱（XPS）和原位可见/紫外拉曼表征方法研究了新鲜和再生催化剂的结构特征。在重复使用的样品中可以清楚地观察到高价锰物种的不可逆转化以及Frenkel型氧空位和晶格氧的减少，这与轻度失活有关。观众和参与者是弗伦克尔型氧空位的两种现有形式。值得注意的是，参与者在每个反应周期后几乎完全再生，从而确保了激活O _latt的能力。在反复的烟灰氧化过程中。因此，该催化剂保持了良好的活性和令人满意的耐久性，这主要是因为参加者的水平相对稳定。