Constructing cerium and manganese bimetallic catalysts with excellent catalytic performance for soot combustion is the research frontier at present. In order to find out the key factors for catalytic soot combustion of Ce–Mn–O catalysts, a series of Ce–Mn–O catalysts with different Ce/Mn proportions were prepared by co-precipitation method. The activity test results show that it increases first and then decreases with the increase of Mn content. The best catalytic activity is obtained for Ce_0.64Mn_0.36 catalyst, which shows a maximum rate temperature (T_m) at 306 °C for CO₂ production in TPO curve. Compared with non-catalytic soot combustion, the T_m decreases by more than 270 °C. Systematical characterization results suggest that when the adsorbed surface oxygen, lattice oxygen, specific surface area and total reduction amount of the catalysts reach a certain value, the key factors leading to the difference of catalytic activity become the readily reducible and highly dispersed surface manganese oxide species and contact performance of the external surface. The surface manganese oxide species is beneficial to improving the low-temperature reducibility of catalysts and the porous surface is conducive to the contact between catalyst and soot. Furthermore, for the soot combustion reaction containing only O₂, the promoting effect of Mn⁴⁺ is not obvious.

构建具有优异催化性能的铈锰双金属催化剂用于烟尘燃烧是目前的研究前沿。为了找出Ce-Mn-O催化剂催化烟炱燃烧的关键因素，采用共沉淀法制备了一系列不同Ce/Mn比例的Ce-Mn-O催化剂。活性测试结果表明，随着Mn含量的增加，它先增大后减小。_{Ce 0.64} Mn _0.36催化剂的催化活性最佳，在TPO曲线中显示出CO ₂生成的最大速率温度（T _m）为306 ℃ 。与非催化碳烟燃烧相比，T _m降低超过 270 °C。系统表征结果表明，当催化剂的吸附表面氧、晶格氧、比表面积和总还原量达到一定值时，导致催化活性差异的关键因素成为易还原且高度分散的表面氧化锰物种。和外表面的接触性能。表面氧化锰物种有利于提高催化剂的低温还原性，多孔表面有利于催化剂与烟炱的接触。此外，对于仅含O _{2的烟炱燃烧反应，Mn} ⁴⁺的促进作用不明显。