Journal
APPLIED SURFACE SCIENCE
Volume 569, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151041
Keywords
Soot oxidation; Gasoline particulate filter catalyst; Ag-doped manganese oxide; Crystal phase effect; Active oxygen regeneration
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2016R1A5A1009592]
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The manganese oxide catalysts were synthesized using a hydrothermal method with the addition of silver to enhance active oxygen generation. In experiments under GPF conditions, Mn2O3 showed higher soot oxidation activity compared to cryptomelane due to its better regeneration of active oxygen. This study unveiled the main factor contributing to the soot oxidation activity of manganese oxide, providing insights for further research in this field.
Manganese oxide catalysts were synthesized by a hydrothermal method, and silver was doped to promote active oxygen generation. As the calcination temperature increased, the crystal phases of manganese oxide were changed into Mn2O3 from cryptomelane (KMn8O16). In the soot oxidation experiments under GPF conditions, Mn2O3 exhibited higher soot oxidation activities than cryptomelane. To identify the reason for soot oxidation activities, general characterization methods related to the redox properties of the catalyst were performed, including XPS, O-2-TPD, H-2 TPR, and Soot TPR. However, the soot oxidation activities were not correlated with the characterization results because cryptomelane had higher reducibility compared to Mn2O3. Therefore, cycled H-2-TPR, which reflects the redox mechanism of the catalyst in the oxidation reaction, was performed. As a result, Mn2O3 readily regenerated active oxygen compared with cryptomelane, which resulted in higher soot oxidation activity under GPF conditions. In this study, the main factor in the soot oxidation activity of manganese oxide was unveiled, and the result is believed to be helpful in further study of soot oxidation using manganese oxide catalysts.
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