부산대학교 도서관

Catalytic oxidation for soot emissions from diesel engines is a major post-processing technology, but limitedby the lack of efficient catalysts. Herein, a series of MnCeOx catalysts with different Mn/Ce molarratios were prepared by the traditional hydrothermal (tr-MnCeOx) and MOFs derivatization method(M-MnCeOx), and mechanism behind for soot combustion were investigated by several techniques anddensity functional theory (DFT) calculations. Encouragingly, N2 adsorption–desorption result demonstratesM-MnCeOx has a larger specific surface area, thus increasing the number of active sites and contactefficiency between soot and catalysts. Further, XPS, H2-TPR observations manifest the appropriate Cedoping would promote the generation of oxygen vacancy through the redox cycle ofCe4+ + Mn3+ M Mn4+ + Ce3+, thereby improving the catalytic performance for soot combustion. Moreimportantly, the DFT calculations indicate that MOFs-derived 2Mn1Ce-200 possesses the lowest oxygenvacancy formation energy and stronger affinity for both O2 and H2O, which is favorable for the generationof active oxygen species. Among all catalysts, the 2Mn1Ce (Mn/Ce molar ratio of 2:1) exhibited the highestcatalytic activity under tight contact with T90 value of 360 C, and maintained good stability. Our workprovides guidance for developing catalysts with tunable physicochemical properties.