Fe–Mn/γ-Al2O3 catalysts that prepared by the wet-impregnation method were used to degrade toluene, a VOCs model compound. The results indicated that the 10Fe–15Mn/γ-Al2O3 exhibited 95% of toluene conversion as well as 95% of CO2 yield at 300 °C. The Fe–Mn/γ-Al2O3 showed a better toluene oxidation activity with respect to the Fe/γ-Al2O3 and Mn/γ-Al2O3. The introduction of Fe into the Mn/γ-Al2O3 resulted in higher surface area, higher Mn3+/(Mn3+ + Mn4+) ratio, lower reduction temperature, and homogenous distribution of Mn. Meanwhile, the co-exist of the Fe3+ and Mn3+ over the 10Fe–15Mn/γ-Al2O3 also favored for the oxygen transfer, which may enhance the catalytic oxidation performance. The initial toluene was adsorbed on surface of the catalysts and formed benzoyl oxide (C6H5–CH2–O), and then the benzoyl oxide (C6H5–CH2–O) was oxidized to benzaldehyde. Furthermore, the benzaldehyde was further oxidized to form benzoic acid that could be converted to CO2 and H2O.

中文翻译：

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氧化铁作为 Fe-Mn/γ-Al2O3 催化剂上甲苯催化氧化的促进剂

通过湿浸渍法制备的 Fe-Mn/γ-Al2O3 催化剂用于降解甲苯，一种 VOCs 模型化合物。结果表明，10Fe-15Mn/γ-Al2O3 在 300 °C 时表现出 95% 的甲苯转化率和 95% 的 CO2 产率。Fe-Mn/γ-Al2O3 表现出比 Fe/γ-Al2O3 和 Mn/γ-Al2O3 更好的甲苯氧化活性。将 Fe 引入 Mn/γ-Al2O3 导致更高的表面积、更高的 Mn3+/(Mn3+ + Mn4+) 比、更低的还原温度和 Mn 的均匀分布。同时，Fe3+和Mn3+在10Fe-15Mn/γ-Al2O3上的共存也有利于氧的转移，这可能会提高催化氧化性能。最初的甲苯吸附在催化剂表面并形成苯甲酰氧化物（C6H5-CH2-O），然后将苯甲酰氧化物 (C6H5-CH2-O) 氧化成苯甲醛。此外，苯甲醛进一步氧化形成苯甲酸，可转化为 CO2 和 H2O。