The development of Fe-based catalysts for the selective catalytic reduction of NO_x by NH₃ (NH₃–SCR of NO_x) has garnered significant attention due to their exceptional SO₂ resistance. However, the influence of different sulfur-containing species (e.g., ferric sulfates and ammonium sulfates) on the NH₃–SCR activity of Fe-based catalysts as well as its dependence on exposed crystal facets of Fe₂O₃ has not been revealed. This work disclosed that nanorod-like α-Fe₂O₃ (Fe₂O₃–NR) predominantly exposing (110) facet performed better than nanosheet-like α-Fe₂O₃ (Fe₂O₃–NS) predominantly exposing (001) facet in NH₃–SCR reaction, due to the advantages of Fe₂O₃–NR in redox properties and surface acidity. Furthermore, the results of the SO₂/H₂O resistance test at a critical temperature of 250 °C, catalytic performance evaluations on Fe₂O₃–NR and Fe₂O₃–NS sulfated by SO₂ + O₂ or deposited with NH₄HSO₄ (ABS), and systematic characterization revealed that the reactivity of ammonium sulfates on Fe₂O₃ catalysts to NO(+O₂) contributed to their improved catalytic performance, while ferric sulfates showed enhancing and inhibiting effects on NH₃–SCR activity on Fe₂O₃–NR and Fe₂O₃–NS, respectively; despite this, Fe₂O₃–NR showed higher affinity for SO₂ + O₂. This work set a milestone in understanding the NH₃–SCR reaction on Fe₂O₃ catalysts in the presence of SO₂ from the aspect of crystal facet engineering.

中文翻译：

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通过晶面工程调节 α-Fe2O3 NH3-SCR NOx 催化剂的活性和 SO2 耐受性


NH ₃ 选择性催化还原 NO _x 的铁基催化剂（NH ₃ –NO _x 的 SCR） ）由于其卓越的 SO ₂ 耐受性而引起了广泛关注。然而，不同的含硫物质（例如硫酸铁和硫酸铵）对Fe基催化剂的NH ₃ –SCR活性的影响及其对Fe O ₃ 尚未透露。这项工作揭示了纳米棒状 α-Fe ₂ O ₃ (Fe ₂ O ₃ –NR) 主要暴露 (110)小面的性能优于纳米片状 α-Fe ₂ O ₃ (Fe ₂ O ₃ –NS) 主要暴露 (001)由于 Fe ₂ O ₃ –NR 在氧化还原性能和表面酸性方面的优势，NH ₃ –SCR 反应中的小面。此外，还进行了250℃临界温度下的SO ₂ /H ₂ O抗阻测试结果，对Fe ₂ O –NR 和 Fe ₂ O ₃ –NS 通过 SO 硫酸化 ₂ + O ₂ 或用 NH 沉积 < b27> HSO ₄ (ABS)，系统表征表明硫酸铵在 Fe ₂ O ₃ 催化剂上对 NO(+ O ₂ ) 有助于提高其催化性能，而硫酸铁对 Fe ₂ O ₃ –SCR 活性表现出增强和抑制作用/b34> –NR 和 Fe ₂ O ₃ –NS；尽管如此，Fe ₂ O ₃ –NR 对 SO ₂ + O ₂ 表现出更高的亲和力。 这项工作在理解 Fe ₂ O ₃ 催化剂上在 SO ₂ 存在下的 NH ₃ –SCR 反应方面树立了里程碑。晶面工程方面。