Role of Cryptomelane in Surface-Adsorbed Oxygen and Mn Chemical Valence in MnOx during the Catalytic Oxidation of Toluene
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Abstract
A series of manganese oxide catalysts were prepared via a coprecipitation method by adjusting the molar ratio of Mn(NO3)2/KMnO4 and used to catalyze the oxidation of toluene. The MnOx catalyst prepared by the Mn(NO3)2/KMnO4 ratio of 3:7 showed the best catalytic activity, and more than 90% conversion was obtained at 238 °C. The superior catalytic activity of MnOx could be attributed to its slightly higher specific surface area and better pore size distribution. Furthermore, more surface-adsorbed oxygen and Mn3+ species provided more oxygen vacancies, which could increase the ability of oxygen migration, resulting in the improvement of the redox performance and catalytic activity, which depended on the Mn(NO3)2/KMnO4 ratios. Importantly, the formation of cryptomelane (KMn8O16) contributed greatly to the toluene catalytic oxidation ability and CO2 selectivity.
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