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<p>Cerium dioxide with polyhedral morphology (CeO<sub>2</sub>-NPs) was loaded with Mn and/or Fe oxides by applying impregnation method (I-Ce@Mn and I-Ce@Mn-Fe) or solid-phase diffusion method (S-Ce@Mn and S-Ce@Mn-Fe) to study the performance improvement. The results showed that the activity sequence in the temperature range of 100–300&#xa0;°C of the four catalysts was I-Ce@Mn-Fe &gt; S-Ce@Mn-Fe &gt; I-Ce@Mn &gt; S-Ce@Mn. The NO<i>x</i> conversion of I-Ce@Mn-Fe yielded the highest activity. Results showed that the relative contents of Ce<sup>3+</sup> and adsorbed oxygen on the surface of the catalyst supported by impregnation method were higher than those supported by solid-phase diffusion method, and the relative contents of Ce<sup>3+</sup> and adsorbed oxygen on the surface of the I-Ce@Mn-Fe catalyst were the highest. I-Ce@Mn-Fe catalyst also showed the largest H<sub>2</sub> consumption at low temperature, showing best redox performance. In conclusion, the introduction method of Mn and Fe by using impregnation method on CeO<sub>2</sub>-NPs could effectively improve the SCR performance.</p>

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Effect of different introduction methods of Mn and Fe on polyhedral morphology CeO2 for low-temperature NH3-SCR

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Yuhan Zhou,
  • Chen Yang,
  • Wei Tong,
  • Man Yin,
  • Genfa Chen,
  • Lingfeng Du,
  • Jie Yang

摘要

Cerium dioxide with polyhedral morphology (CeO2-NPs) was loaded with Mn and/or Fe oxides by applying impregnation method (I-Ce@Mn and I-Ce@Mn-Fe) or solid-phase diffusion method (S-Ce@Mn and S-Ce@Mn-Fe) to study the performance improvement. The results showed that the activity sequence in the temperature range of 100–300 °C of the four catalysts was I-Ce@Mn-Fe > S-Ce@Mn-Fe > I-Ce@Mn > S-Ce@Mn. The NOx conversion of I-Ce@Mn-Fe yielded the highest activity. Results showed that the relative contents of Ce3+ and adsorbed oxygen on the surface of the catalyst supported by impregnation method were higher than those supported by solid-phase diffusion method, and the relative contents of Ce3+ and adsorbed oxygen on the surface of the I-Ce@Mn-Fe catalyst were the highest. I-Ce@Mn-Fe catalyst also showed the largest H2 consumption at low temperature, showing best redox performance. In conclusion, the introduction method of Mn and Fe by using impregnation method on CeO2-NPs could effectively improve the SCR performance.