Supported Mn₂O₃ is useful in achieving high dinitrogen selectivity at low temperature during ammonia-selective catalytic reduction (SCR). However, its controlled synthesis is challenging when the supporting material is the conventional pure silicon SBA-15 mesoporous molecular sieve. Here we show that silicon and aluminium in fly ash, the solid waste produced by coal-fired power plants, can be used to synthesize an Al-SBA-15 mesoporous molecular sieve support, which can guide the growth of Mn₂O₃ in the as-synthesized Fe-Mn/Al-SBA-15 NH₃-SCR catalyst. Its superior catalytic performance is demonstrated by the high NO_x conversion (≥90%) and selectivity (≥86%) at low temperatures (150–300 °C). The combined theoretical and experimental results reveal that the introduction of Al induces the growth of Mn₂O₃ catalysts. Our findings, therefore, provide a strategy for the rational design of low-temperature NH₃-SCR catalysts through dopant-induced component engineering of composite materials.

负载型 Mn ₂ O ₃可用于在氨选择性催化还原 (SCR) 过程中在低温下实现高双氮选择性。然而，当支撑材料为传统的纯硅SBA-15介孔分子筛时，其可控合成具有挑战性。在这里，我们展示了飞灰中的硅和铝，即燃煤电厂产生的固体废物，可用于合成 Al-SBA-15 介孔分子筛载体，该载体可引导 Mn ₂ O ₃在合成后的 Fe-Mn/Al-SBA-15 NH ₃ -SCR 催化剂。其优越的催化性能体现在高_NOx在低温 (150–300 °C) 下的转化率 (≥90%) 和选择性 (≥86%)。结合理论和实验结果表明，Al 的引入诱导了 Mn ₂ O ₃催化剂的生长。因此，我们的研究结果为通过复合材料的掺杂诱导组分工程合理设计低温 NH _{3 -SCR 催化剂提供了策略。}