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Catalytic oxidation for soot emissions from diesel engines is a major post-processing technology, but limited by the lack of efficient catalysts. Herein, a series of MnCeO_x catalysts with different Mn/Ce molar ratios were prepared by the traditional hydrothermal (tr-MnCeO_x) and MOFs derivatization method (M-MnCeO_x), and mechanism behind for soot combustion were investigated by several techniques and density functional theory (DFT) calculations. Encouragingly, N₂ adsorption–desorption result demonstrates M-MnCeO_x has a larger specific surface area, thus increasing the number of active sites and contact efficiency between soot and catalysts. Further, XPS, H₂-TPR observations manifest the appropriate Ce doping would promote the generation of oxygen vacancy through the redox cycle of Ce⁴⁺ + Mn³⁺ ↔ Mn⁴⁺ + Ce³⁺, thereby improving the catalytic performance for soot combustion. More importantly, the …