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<p>Catalytic oxidation is a pivotal technology for Hg<sup>0</sup> emission control in coal-fired flue gas. However, the presence of high-concentration impurity gases (e.g., SO<sub>2</sub> and H<sub>2</sub>O) severely inhibits the catalytic activity through competitive adsorption with Hg<sup>0</sup>. Herein, natural montmorillonite (MMT) was modified with hexadecyl trimethyl ammonium bromide (CTAB) and then loaded with amorphous MnO<sub>x</sub> to construct a catalyst for the removal of Hg<sup>0</sup> in simulated flue gas. This approach enables the regulation of the hydrophobicity and polarity of the support through organic functional groups, which can suppress the enrichment of H<sub>2</sub>O and SO<sub>2</sub> on the support and its migration to MnO<sub>x</sub> active sites. By this merit, the catalyst achieved &gt; 98% Hg<sup>0</sup> removal efficiency at 150&#xa0;°C under simulated flue gas (180&#xa0;µg/m<sup>3</sup> Hg<sup>0</sup>, 1500 ppm SO<sub>2</sub>, 3% H<sub>2</sub>O). This study offers valuable insights for designing Hg<sup>0</sup> removal catalysts, particularly in enhancing their sulfur and water resistance.</p> Graphical Abstract <p></p>

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Functionalized MnOx/Montmorillonite for High-efficiency Hg0 Removal in Simulated Flue Gas: Synergistic Hydrophobic and Polar Modifications

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Xuhui Wei,
  • Ruoyang Du,
  • Rushan Zhao,
  • Yang Xu,
  • Huan Wang,
  • Binbin Jiang,
  • Geqian Fang,
  • Junwei Wang

摘要

Catalytic oxidation is a pivotal technology for Hg0 emission control in coal-fired flue gas. However, the presence of high-concentration impurity gases (e.g., SO2 and H2O) severely inhibits the catalytic activity through competitive adsorption with Hg0. Herein, natural montmorillonite (MMT) was modified with hexadecyl trimethyl ammonium bromide (CTAB) and then loaded with amorphous MnOx to construct a catalyst for the removal of Hg0 in simulated flue gas. This approach enables the regulation of the hydrophobicity and polarity of the support through organic functional groups, which can suppress the enrichment of H2O and SO2 on the support and its migration to MnOx active sites. By this merit, the catalyst achieved > 98% Hg0 removal efficiency at 150 °C under simulated flue gas (180 µg/m3 Hg0, 1500 ppm SO2, 3% H2O). This study offers valuable insights for designing Hg0 removal catalysts, particularly in enhancing their sulfur and water resistance.

Graphical Abstract