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

IF 3.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Research on Chemical Intermediates Pub Date : 2025-09-17 DOI:10.1007/s11164-025-05737-8

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

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引用次数: 0

Abstract

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.

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Mn和Fe不同引入方式对低温NH3-SCR中CeO2多面体形貌的影响

采用浸渍法（I-Ce@Mn和I-Ce@Mn-Fe）或固相扩散法（S-Ce@Mn和S-Ce@Mn-Fe）对具有多面体形态的二氧化铈（CeO2-NPs）进行Mn和/或Fe氧化物的负载，研究其性能的改善。结果表明，4种催化剂在100 ~ 300℃范围内的活性顺序为I-Ce@Mn-Fe >； S-Ce@Mn-Fe > I-Ce@Mn > S-Ce@Mn。I-Ce@Mn-Fe的NOx转化率最高。结果表明：浸渍法负载的催化剂表面Ce3+和吸附氧的相对含量高于固相扩散法负载的催化剂，其中I-Ce@Mn-Fe催化剂表面Ce3+和吸附氧的相对含量最高。I-Ce@Mn-Fe催化剂在低温下H2消耗量最大，具有最佳的氧化还原性能。综上所述，采用浸渍法在CeO2-NPs上引入Mn和Fe的方法可以有效地提高SCR性能。

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来源期刊

Research on Chemical Intermediates 化学-化学综合

CiteScore

5.70

自引率

18.20%

发文量

229

审稿时长

2.6 months

期刊介绍： Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry. The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.