Influence of hydrothermal synthesis temperature on the redox and oxygen mobility properties of manganese oxides in the catalytic oxidation of toluene
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A series of MnOx samples synthesized by hydrothermal methods at different temperatures were investigated as catalysts for the oxidation of toluene. The optimum oxidation performance was achieved with the catalyst prepared at 120 °C (Mn-120), for which complete conversion of toluene was attained at 250 °C. The Mn-120 sample possessed the highest concentration of Mn3+ and the highest initial H2 consumption rate, which are indicative of abundant crystal defects and superior reducibility. In addition, Mn-120 exhibited excellent oxidation ability due to the abundance of lattice oxygen species and excellent oxygen mobility. Therefore, the superior catalytic performance of Mn-120 could be attributed mainly to its redox performance and abundant crystal defects, both of which are determined by the temperature of the hydrothermal synthesis of MnOx.
This work was supported by the National Natural Science Foundation of China (No. 21872096).