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<p>A highly active and stable SO<sub>2</sub> reduction catalyst, 3%La-15%Fe/γ-Al<sub>2</sub>O<sub>3</sub>, was successfully synthesized using γ-Al<sub>2</sub>O<sub>3</sub> derived from coal gangue. The structural properties of the synthesized catalyst were analyzed using XPS, SEM, TEM, EDS, BET, XRD, and H<sub>2</sub>-TPR. Characterization studies revealed a high BET specific surface area of 288.55&#xa0;m<sup>2</sup>/g for the coal gangue-derived mesoporous γ-Al<sub>2</sub>O<sub>3</sub>. Furthermore, lanthanum doping inhibited iron crystallite growth, enhancing dispersion on the support and contributing to superior catalytic performance. Under optimized conditions (380&#xa0;°C, 6000&#xa0;h<sup>−1</sup> GHSV, and a CO/SO<sub>2</sub> ratio of 2), the catalyst achieved 98.92 ± 1.3% SO<sub>2</sub> conversion and 99.43 ± 0.7% selectivity to elemental sulfur. This high performance remained stable for over 50&#xa0;h, demonstrating the catalyst’s potential for industrial application. The utilization of coal gangue-derived γ-Al<sub>2</sub>O<sub>3</sub> offers both economic and environmental benefits by providing a cost-effective support material and addressing coal gangue disposal challenges. This work presents a promising strategy for sustainable SO<sub>2</sub> abatement and resource utilization.</p>

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Cost-effective lanthanum-promoted iron catalyst on coal gangue-derived mesoporous γ-Al2O3 for SO2 catalytic reduction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月8日

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  • Mohammad Sepehrian,
  • Mansoor Anbia,
  • Fatemeh Yazdi

摘要

A highly active and stable SO2 reduction catalyst, 3%La-15%Fe/γ-Al2O3, was successfully synthesized using γ-Al2O3 derived from coal gangue. The structural properties of the synthesized catalyst were analyzed using XPS, SEM, TEM, EDS, BET, XRD, and H2-TPR. Characterization studies revealed a high BET specific surface area of 288.55 m2/g for the coal gangue-derived mesoporous γ-Al2O3. Furthermore, lanthanum doping inhibited iron crystallite growth, enhancing dispersion on the support and contributing to superior catalytic performance. Under optimized conditions (380 °C, 6000 h−1 GHSV, and a CO/SO2 ratio of 2), the catalyst achieved 98.92 ± 1.3% SO2 conversion and 99.43 ± 0.7% selectivity to elemental sulfur. This high performance remained stable for over 50 h, demonstrating the catalyst’s potential for industrial application. The utilization of coal gangue-derived γ-Al2O3 offers both economic and environmental benefits by providing a cost-effective support material and addressing coal gangue disposal challenges. This work presents a promising strategy for sustainable SO2 abatement and resource utilization.