To improve the catalytic activity when utilizing metal oxides for the combustion of VOCs, Mn/Al-SBA-15 catalysts have been successfully synthesized through an emerging wetness impregnation technique involving Mn(NO₃)₂ on Al-SBA-15, which has been directly prepared from attapulgite by a hydrothermal method. Compared to Mn/SBA-15, which is prepared with TEOS as its silicon source, all the as-prepared Mn/Al-SBA-15 catalysts demonstrated enhanced catalytic performance in the oxidation of toluene. From this research, the 8% Mn/Al-SBA-15 catalyst presented the best catalytic performance, due to the high efficiency resulting from the high chemical valence of Mn⁴⁺. When the concentration of toluene was 2000 ppm, and the space velocity was 60 000 mL (g h)⁻¹, 8% Mn/Al-SBA-15 could effectively reduce the T₅₀ and T₉₀ values of toluene to 201 and 278 °C, respectively; while the 8% Mn/SBA-15 catalyst could reduce the T₅₀ and T₉₀ values of toluene to 223 and 298 °C, respectively. A systematic investigation has been conducted to reveal the synergistic effects of Al doping and manganese loading on the enhanced catalytic performance. The experiments showed impressive results, demonstrating that Al doping can not only increase the surface acidity of SBA-15, but it can also be beneficial for achieving a uniform dispersion of MnO_x on the surface and in the pores of Al-SBA-15, resulting in the enhancement of the catalytic performance.

中文翻译：

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MnOx 分散在凹凸棒石衍生的 Al-SBA-15 上：一种有前途的挥发性有机化合物燃烧催化剂

为了提高利用金属氧化物燃烧 VOCs 时的催化活性，已通过新兴的湿浸渍技术成功合成了 Mn/Al-SBA-15 催化剂，该技术涉及 Mn(NO ₃ ) ₂在 Al-SBA-15 上，已被由凹凸棒石通过水热法直接制备。与以 TEOS 为硅源制备的 Mn/SBA-15 相比，所有制备的 Mn/Al-SBA-15 催化剂在甲苯氧化中表现出增强的催化性能。^{从这项研究中，8% Mn/Al-SBA-15 催化剂表现出最好的催化性能，这是由于 Mn 4+}的高化学价态带来的高效率。当甲苯浓度为 2000 ppm，空速为 60 000 mL (gh)^-1 , 8% Mn/Al-SBA-15 可以有效地将甲苯的T ₅₀和T ₉₀值分别降低到201和278 ℃；而 8% Mn/SBA-15 催化剂可以将甲苯的T ₅₀和T ₉₀值分别降低到 223 和 298 °C。已经进行了系统研究以揭示Al掺杂和锰负载对增强催化性能的协同作用。实验显示了令人印象深刻的结果，表明 Al 掺杂不仅可以增加 SBA-15 的表面酸度，而且还有助于实现 MnO _{x的均匀分散}在 Al-SBA-15 的表面和孔隙中，从而提高了催化性能。