Abstract
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, O2-TPD, H2 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 H2-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.
Original language | English |
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Article number | 151041 |
Journal | Applied Surface Science |
Volume | 569 |
DOIs | |
Publication status | Published - 2021 Dec 15 |
Bibliographical note
Funding Information:This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF-2016R1A5A1009592).
Publisher Copyright:
© 2021
Keywords
- Active oxygen regeneration
- Ag-doped manganese oxide
- Crystal phase effect
- Gasoline particulate filter catalyst
- Soot oxidation
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- General Physics and Astronomy
- Surfaces and Interfaces
- Surfaces, Coatings and Films