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Chemcial Industry and Engineering 2018, Vol. 35 Issue (4) :32-37,45    DOI: 10.13353/j.issn.1004.9533.20161063
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The Effect of Manganese/Cerium Interactions in Catalytic Soot Combustion
Wang Lei1,2, Cao Chunmei1,2, Xing Lingli1,2, Meng Ming1,2, Li Xingang1,2
1. Tianjin Key laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technoloogy, Tianjin University, Tianjin 300072, China;
2. The Collaborative Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, China

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Abstract 

The catalysts of HZSM-5 zeolite loading manganese (9Mn/Z), cerium (9Ce/Z) and manganese-cerium (4.5Mn4.5Ce/Z) were prepared by incipient wetness impregnation method. The catalytic activities of these catalysts were investigated for soot combustion. The results show that the (4.5Mn4.5Ce/Z) catalyst has higher catalytic activity of soot combustion and the temperature of soot conversion 50% (T50)is 400℃. It is lower than that of 9Mn/Z (T50=414℃) and 9Ce/Z (T50=447℃) catalysts, and decreases by 128℃ compared with the pure soot combustion. The hydrogen temperature programmed reduction (H2-TPR) results show that the hydrogen reduction peak of MnOx-CeO2 in the catalyst 4.5Mn4.5Ce/Z shifts toward lower temperatures compared with the catalyst (9Mn/Z) and 9Ce/Z, suggesting its better redox properties with the strong interaction between the MnOx and CeO2. The X-ray photoelectron spectroscopy (XPS) results show that the 4.5Mn4.5Ce/Z catalyst possesses more chemisorbed oxygen species. It should be conducive to the soot oxidation reaction. Thus, the 4.5Mn4.5Ce/Z catalyst performs higher soot combustion catalytic activity.
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Wang Lei
Cao Chunmei
Xing Lingli
Meng Ming
Li Xingang
Keywords： zeolite；   MnOx-CeO2；   interaction；   chemisorbed oxygen species；   soot combustion     
Received 2016-04-11;
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Wang Lei, Cao Chunmei, Xing Lingli, Meng Ming, Li Xingang.The Effect of Manganese/Cerium Interactions in Catalytic Soot Combustion[J]  Chemcial Industry and Engineering, 2018,V35(4): 32-37,45
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