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<p>NH<sub>3</sub>-SCR is the most used De-NOx technology and the catalyst is core. In this study, LaMnO<sub>3</sub> is supported on γFe<sub>2</sub>O<sub>3</sub> by citric acid solution gel method to obtain catalyst with high low temperature activity and wide temperature window. The result shows that when the loading amount is 40%, the catalyst has the best de-NOx effect with efficiency reaches 93% at 240 ℃, and the active temperature window is between 200 ~ 330 ℃. The formation of an appropriate amount of LaMnO<sub>3</sub> crystals can promote the SCR reaction process, and the loading can increase the specific surface area of the catalyst, providing more active sites on the surface. Meanwhile, the presence of Fe will enrich the surface Mn valence states, and Mn<sup>4+</sup> is effective in promoting NO conversion rate. As well as, there are both E-R and L-H mechanisms on the surface of the LaMnO<sub>3</sub>/γFe<sub>2</sub>O<sub>3</sub> catalyst.</p> Graphical Abstract <p></p>

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Study on the de-NOx Activity and Reaction Mechanism of LaMnO3/γFe2O3 Supported Catalyst

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Dongdong Ren,
  • Fengqiang Miao,
  • Xinyu Wang,
  • Hao Wan,
  • Dongji Yang,
  • Wencong Hao,
  • Xiangming Zhao,
  • Linyang Zhang,
  • Siyi Luo,
  • Jianxiang Guo

摘要

NH3-SCR is the most used De-NOx technology and the catalyst is core. In this study, LaMnO3 is supported on γFe2O3 by citric acid solution gel method to obtain catalyst with high low temperature activity and wide temperature window. The result shows that when the loading amount is 40%, the catalyst has the best de-NOx effect with efficiency reaches 93% at 240 ℃, and the active temperature window is between 200 ~ 330 ℃. The formation of an appropriate amount of LaMnO3 crystals can promote the SCR reaction process, and the loading can increase the specific surface area of the catalyst, providing more active sites on the surface. Meanwhile, the presence of Fe will enrich the surface Mn valence states, and Mn4+ is effective in promoting NO conversion rate. As well as, there are both E-R and L-H mechanisms on the surface of the LaMnO3/γFe2O3 catalyst.

Graphical Abstract