Supported MnFeO_x catalysts have been prepared using Al₂O₃ as the substrate and were investigated for NH₃-SCR. The 20% MnFe/Al₂O₃ catalyst removed over 80% of NO_x with an N₂ selectivity exceeding 90% at temperatures between 80 and 340 °C. The results from the various characterization studies indicated that the increased activity of MnFe/Al₂O₃ catalysts can be primarily linked to the increased chemisorbed oxygen species and Fe³⁺ concentrations, greater reducibility, and higher adsorption capacity for NH₃. These characteristics are the outcome of the strong interaction, larger specific surface, and abundant acidic sites. Additionally, in situ DRIFTS analysis of the reaction mechanism revealed that the E–R and L–H mechanisms were responsible for the NH₃-SCR reaction over the 20% MnFe/Al₂O₃ catalyst.

中文翻译：

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低温NH3-SCR高效MnFe/Al2O3催化剂：活性组分与载体强相互作用的影响

_{使用Al 2} O ₃作为基质制备了负载型MnFeO _{x催化剂，并对其用于NH 3} -SCR 进行了研究。 20% MnFe/Al ₂ O ₃催化剂在80至340°C的温度下去除了超过80%的NO _x，N ₂选择性超过90%。各种表征研究的结果表明，MnFe/Al ₂ O ₃催化剂活性的增加主要与化学吸附氧种类和Fe ³⁺浓度的增加、更大的还原性和更高的NH ₃吸附能力有关。这些特性是强相互作用、较大的比表面和丰富的酸性位点的结果。此外，反应机理的原位DRIFTS分析表明，E-R和L-H机理是20％MnFe/Al ₂ O _{3催化剂上NH 3} -SCR反应的原因。