Improvement of SO 2 Resistance of Low-Temperature Mn-Based Denitration Catalysts by Fe Doping

作者：Jinyu Wang, Zhaoguang Nie, Zewen An, Hongcun Bai, Fengyin Wang, Xiuli Zhang, Yanhui Li, Cuiping Wang · 发表于：ACS Omega · 年份：2019 · DOI：10.1021/acsomega.9b00002 · 被引用次数：23 · 研究领域：Catalytic Processes in Materials Science、Industrial Gas Emission Control、Gas Sensing Nanomaterials and Sensors

High Resolution Image Download MS PowerPoint Slide 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.