Fe and/or Mn/SBA-15 catalysts were prepared by the impregnation method using low-cost fly ash-derived SBA-15 molecular sieve as support and tested towards NH₃-SCR. Powder XRD, N₂ adsorption, XPS, H₂-TPR and SEM techniques were used for catalyst characterization and investigation of relationships with the catalytic activity. The Fe-Mn/SBA-15 catalyst exhibited significantly higher NH₃-SCR activities than Mn/SBA-15 or Fe/SBA-15 in the 150–250 °C range owing to some developed synergistic effects between Mn and Fe. In particular, the addition of Mn improved the dispersion of Fe₂O₃ on the catalyst surface, while the addition of Fe promoted the formation of single β-MnO₂ phase. The high dispersion of Fe₂O₃, the appropriate Mn⁴⁺/Mn³⁺ ratio, the concentration of adsorbed oxygen and the low-T enhanced redox activity of the Fe-Mn/SBA-15 improved its NH₃-SCR activity. This work opens new avenues of recycling fly ash formed in coal-fired power plants (reducing environmental pollution) and developing low-cost SCR catalysts for NO_x pollution control.

用低成本的粉煤灰衍生的SBA-15分子筛作为载体，通过浸渍法制备了Fe和/或Mn / SBA-15催化剂，并进行了NH ₃ -SCR测试。采用粉末XRD，N ₂吸附，XPS，H ₂ -TPR和SEM技术对催化剂进行表征，并研究其与催化活性之间的关系。在150-250°C范围内，Fe-Mn / SBA-15催化剂比Mn / SBA-15或Fe / SBA-15表现出明显更高的NH ₃ -SCR活性，这是由于Mn和Fe之间产生了协同效应。特别地，添加Mn的提高Fe的分散体₂ Ó ₃在催化剂表面上，而添加Fe促进单一的形成β-MnO的₂阶段。Fe ₂ O ₃的高分散性，适当的Mn ⁴⁺ / Mn ³⁺比，吸附的氧浓度和低T增强了Fe-Mn / SBA-15的氧化还原活性，从而改善了其NH ₃ -SCR活性。这项工作为回收燃煤电厂中形成的粉煤灰开辟了新途径（减少了环境污染），并开发了用于控制NO _x污染的低成本SCR催化剂。