Yuhan Zhou, Chen Yang, Wei Tong, Man Yin, Genfa Chen, Lingfeng Du, Jie Yang
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Effect of different introduction methods of Mn and Fe on polyhedral morphology CeO2 for low-temperature NH3-SCR
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.
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.
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