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.

中文翻译：

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水热合成温度对甲苯催化氧化锰氧化物氧化还原和氧迁移性能的影响

研究了在不同温度下通过水热法合成的一系列 MnOx 样品作为甲苯氧化的催化剂。使用在 120 °C 下制备的催化剂 (Mn-120) 实现了最佳氧化性能，在 250 °C 下实现了甲苯的完全转化。Mn-120 样品具有最高的 Mn3+ 浓度和最高的初始 H2 消耗率，这表明大量的晶体缺陷和优越的还原性。此外，Mn-120 具有丰富的晶格氧物种和优异的氧迁移率，因此表现出优异的氧化能力。因此，Mn-120 优异的催化性能主要归功于其氧化还原性能和丰富的晶体缺陷，这两者都是由 MnOx 水热合成的温度决定的。