Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 268, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118422
Keywords
Soot combustion catalysts; CeMnCuO; Catalyst composition design; Average valence state
Funding
- Yunnan Province Science and Technology Talent and Platform Program Project [2018IC091]
- Yunnan Province Major Science and Technology Project [2018ZE017]
- Yunnan Province Applied Basic Research Program [2017FB143]
- Natural Science Foundation of China, Regional Science Foundation Project [21467010]
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Ternary Ce-Mn-Cu mixed oxides as soot oxidation catalysts have been designed and prepared by co-precipitation method (getting CMC-Cp) or impregnation (CMC-Imp), based on the already optimized Ce/Mn and Mn/Cu ratios. Several corresponding binary and single oxides were also prepared for reference. It turned out that the coprecipitation method could produce catalysts with high S am , small grain size as well as enhanced reducibility and catalytic activity compared to the impregnation method. Among all the catalysts, CMC-Cp-c which was based on the assumption that Ce-Mn-O and Mn-Cu-O components are independent from each other, showed the best catalytic activity. Based on the rich sample library, the positive correlation between reducibility and catalytic activity, and that between the average valence state of the dominant Ce and reducibility (or catalytic activity) were established. Furthermore, the effect of soot and/or H2O addition on NO oxidation, and that of H2O addition on soot combustion were thoroughly studied.
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