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A series of manganese-cerium mixed oxides were prepared by a glycothermal method, and the NO decomposition activities of the Ba-loaded Ce-Mn oxides were examined. Among the catalysts examined, the highest NO conversion was obtained on the BaO/Ce-Mn oxide catalyst with a Mn/(Ce+Mn) ratio of 0.25. The X-ray diffraction and Raman analyses indicated the formation of Ce-Mn oxide solid solutions with a cubic fluorite structure. The electron spin resonance analysis indicated the presence of paramagnetic Mn 2+ species in the composite catalysts. Incorporation of Mn 2+ in the fluorite structure of CeO 2 causes an increase in the concentration of oxygen vacancies, which play an important role in the NO decomposition activity of the catalysts. The catalysts were also characterized by X-ray photoelectron spectroscopy and temperature-programmed reduction techniques. Based on the results obtained, the relationship between the physical properties of the catalysts and their NO decomposition activities was discussed.

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