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<p>Municipal solid waste incineration fly ash (MSWI-FA) is rich in heavy metals and dioxins, posing severe challenges for its safe disposal and resource utilization. In this study, zeolite catalysts were synthesized from MSWI-FA via a hydrothermal method, and the cooperative enhancement mechanisms of acid-washing pretreatment (2&#xa0;mol L<sup>−1</sup> HCl) and lanthanum (La) modification on the NH₃-SCR denitrification performance were systematically investigated. The results revealed that acid washing effectively removed impurities such as Ca and K from fly ash, enhancing the zeolite crystallinity and specific surface area. Meanwhile, La loading introduced strong Lewis acid sites, significantly improving the NH₃ adsorption and NOx activation capabilities of the catalyst. Under optimal conditions (acid washing for 30&#xa0;min and La loading of 0.45 wt%), the FA-12-120-0.45-30 catalyst achieved over 80% denitrification efficiency in the teaamperature range of 200–450℃, with markedly enhanced low-temperature activity. NH₃-TPD and in situ FTIR analyses demonstrated that acid washing and La modification markedly increased the proportion of Lewis acid sites and optimized the Brønsted/Lewis acid balance, thereby promoting the synergistic operation of the Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanisms. This study provides a new strategy for the high-value utilization of MSWI-FA and the rational design of efficient SCR catalysts.</p>

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Enhancing NH₃-SCR Denitrification Performance by Regulating the B/L Acid Balance on the Surface of Municipal Solid Waste Incineration Fly ash-Derived Zeolite

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Wei Zhang,
  • Tao Liu,
  • Zhihao Yao,
  • Kaikai Zhang,
  • Dancong Li,
  • Zhaoyi Zhou,
  • Yanshan Yin,
  • Yanni Xuan,
  • Min Ruan,
  • Shan Cheng,
  • Shouan Cheng,
  • Wenkai Hu,
  • Xiangyong Yang

摘要

Municipal solid waste incineration fly ash (MSWI-FA) is rich in heavy metals and dioxins, posing severe challenges for its safe disposal and resource utilization. In this study, zeolite catalysts were synthesized from MSWI-FA via a hydrothermal method, and the cooperative enhancement mechanisms of acid-washing pretreatment (2 mol L−1 HCl) and lanthanum (La) modification on the NH₃-SCR denitrification performance were systematically investigated. The results revealed that acid washing effectively removed impurities such as Ca and K from fly ash, enhancing the zeolite crystallinity and specific surface area. Meanwhile, La loading introduced strong Lewis acid sites, significantly improving the NH₃ adsorption and NOx activation capabilities of the catalyst. Under optimal conditions (acid washing for 30 min and La loading of 0.45 wt%), the FA-12-120-0.45-30 catalyst achieved over 80% denitrification efficiency in the teaamperature range of 200–450℃, with markedly enhanced low-temperature activity. NH₃-TPD and in situ FTIR analyses demonstrated that acid washing and La modification markedly increased the proportion of Lewis acid sites and optimized the Brønsted/Lewis acid balance, thereby promoting the synergistic operation of the Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanisms. This study provides a new strategy for the high-value utilization of MSWI-FA and the rational design of efficient SCR catalysts.