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<p>Natural sepiolite was subjected to acid pretreatment. Subsequently, MnO<sub>x</sub> was loaded onto both pristine sepiolite (SEP) and acid-pretreated sepiolite (NSEP) supports via an in situ growth method, yielding the MnO<sub>x</sub>/SEP and MnO<sub>x</sub>/NSEP catalyst series. The medium-low temperature NH<sub>3</sub>-SCR denitrification performance of these catalysts was systematically investigated. Characterization techniques (BET, XRD, SEM, TEM, XPS, and TG) were employed to elucidate how acid pretreatment influences on the catalyst structure-performance relationship. Results demonstrate that the MnO<sub>x</sub>/NSEP catalyst, prepared using acid-pretreated sepiolite, exhibits enhanced denitrification catalytic performance within the 150–300&#xa0;°C range. Among the acids tested, nitric acid pretreatment proved more beneficial for the denitrification than hydrochloric acid or sulfuric acid. Acid pretreatment induces fiber disaggregation in sepiolite, promoting uniform loading and dispersion of the active manganese oxide components. It also strengthens the Mn-O-Si interfacial bonding interaction, improving thermal stability. This study presents a novel support modification strategy for developing efficient medium-low temperature SCR catalysts.</p> Graphical abstract

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Preparation and medium-low temperature denitrification performance of MnOx/sepiolite catalysts

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Yi-nuo Liu,
  • Zhi-gang Liao,
  • Yun-he Liu,
  • Kui-bing Jiang,
  • Bo Peng,
  • Ying-cai Han,
  • Bao-hua Yang,
  • Bin Mao,
  • Li-hong Lan

摘要

Natural sepiolite was subjected to acid pretreatment. Subsequently, MnOx was loaded onto both pristine sepiolite (SEP) and acid-pretreated sepiolite (NSEP) supports via an in situ growth method, yielding the MnOx/SEP and MnOx/NSEP catalyst series. The medium-low temperature NH3-SCR denitrification performance of these catalysts was systematically investigated. Characterization techniques (BET, XRD, SEM, TEM, XPS, and TG) were employed to elucidate how acid pretreatment influences on the catalyst structure-performance relationship. Results demonstrate that the MnOx/NSEP catalyst, prepared using acid-pretreated sepiolite, exhibits enhanced denitrification catalytic performance within the 150–300 °C range. Among the acids tested, nitric acid pretreatment proved more beneficial for the denitrification than hydrochloric acid or sulfuric acid. Acid pretreatment induces fiber disaggregation in sepiolite, promoting uniform loading and dispersion of the active manganese oxide components. It also strengthens the Mn-O-Si interfacial bonding interaction, improving thermal stability. This study presents a novel support modification strategy for developing efficient medium-low temperature SCR catalysts.

Graphical abstract