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<p>In the preparation of Ce-Mn oxide catalysts for low-temperature NH<sub>3</sub>-SCR reactions, conventional sintering methods often lead to surface agglomeration of the catalysts, making it difficult to fully expose their active components. In this study, a series of Mn–Ce catalysts were prepared <i>via</i> microwave sintering, which exhibited excellent catalytic activity and good resistance to H<sub>2</sub>O and SO<sub>2</sub> in the selective catalytic reduction of NO with NH<sub>3</sub>. Among them, the Mn–Ce 0.06 catalyst achieved the highest NO conversion at 250&#xa0;°C, outperforming the control sample (Mn–Ce 0.06-M) sintered in the muffle furnace. This superior performance was mainly attributed to its uniform pore structure, excellent reducibility, abundant acidic sites, as well as higher contents of Mn<sup>4+</sup>, surface active oxygen (O<sub>α</sub>), and Ce<sup>3+</sup>. These characteristics promoted the formation of oxygen vacancies and enhanced oxygen migration capability, thereby facilitating the SCR reaction. In situ DRIFTs results demonstrated that the SCR reaction over the Mn–Ce 0.06 catalyst followed both the Eley–Rideal (E-R) mechanism and the Langmuir–Hinshelwood (L-H) mechanism, with Lewis acid sites being the primary acidic sites on the catalyst. This study provides new insights into the microwave-assisted synthesis of high-performance SCR catalysts.</p>

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Microwave sintering synthesis of high-performance Mn–Ce catalysts for NH3-SCR: a study on performance and mechanism

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Haozhou Wang,
  • Ming Zhao,
  • Shuai Fu,
  • Weixiang Shang,
  • Yanting Li,
  • Ran Zhao,
  • Qingchun Wang,
  • Yuwei Ma,
  • Hongxia Li,
  • Jinxiao Bao

摘要

In the preparation of Ce-Mn oxide catalysts for low-temperature NH3-SCR reactions, conventional sintering methods often lead to surface agglomeration of the catalysts, making it difficult to fully expose their active components. In this study, a series of Mn–Ce catalysts were prepared via microwave sintering, which exhibited excellent catalytic activity and good resistance to H2O and SO2 in the selective catalytic reduction of NO with NH3. Among them, the Mn–Ce 0.06 catalyst achieved the highest NO conversion at 250 °C, outperforming the control sample (Mn–Ce 0.06-M) sintered in the muffle furnace. This superior performance was mainly attributed to its uniform pore structure, excellent reducibility, abundant acidic sites, as well as higher contents of Mn4+, surface active oxygen (Oα), and Ce3+. These characteristics promoted the formation of oxygen vacancies and enhanced oxygen migration capability, thereby facilitating the SCR reaction. In situ DRIFTs results demonstrated that the SCR reaction over the Mn–Ce 0.06 catalyst followed both the Eley–Rideal (E-R) mechanism and the Langmuir–Hinshelwood (L-H) mechanism, with Lewis acid sites being the primary acidic sites on the catalyst. This study provides new insights into the microwave-assisted synthesis of high-performance SCR catalysts.