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The influence of vapor and SO 2 in coal firing flue gas on the selective catalytic reduction activity of Mn/γ-Al 2 O 3 and Mn-Fe/γ-Al 2 O 3 catalysts was investigated at 150-275 °C. Denitration experiments and detailed characterization of catalysts were conducted. Vapor had no chemical effects on denitration, and the mechanism of SO 2 deactivating the Mn/γ-Al 2 O 3 catalysts was investigated in detail. This is due to the reaction between MnO 2 and SO 2 and the ammonium sulfate deposits forming on the surface. Sulfation of the Mn-active component was significantly reduced by doping the Mn/γ-Al 2 O 3 catalyst with Fe. Iron doping also lowered the stability of the ammonium sulfate surface deposits, forcing them to rapidly decompose. Thus, iron doping significantly improved SO 2 resistance and the denitration efficiency of Mn-Fe/γ-Al 2 O 3 catalysts was not clearly decreased.

Improvement of SO2 Resistance of Low-Temperature Mn-Based Denitration Catalysts by Fe Doping

Improvement of SO₂ Resistance of Low-Temperature Mn-Based Denitration Catalysts by Fe Doping