TY - JOUR
T1 - Ag-doped manganese oxide catalyst for gasoline particulate filters
T2 - Effect of crystal phase on soot oxidation activity
AU - Kim, Min June
AU - Lee, Eun Jun
AU - Lee, Eunwon
AU - Kim, Do Heui
AU - Lee, Dae Won
AU - Kim, Chang Hwan
AU - Lee, Kwan Young
N1 - 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
PY - 2021/12/15
Y1 - 2021/12/15
N2 - 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.
AB - 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.
KW - Active oxygen regeneration
KW - Ag-doped manganese oxide
KW - Crystal phase effect
KW - Gasoline particulate filter catalyst
KW - Soot oxidation
UR - http://www.scopus.com/inward/record.url?scp=85113459471&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2021.151041
DO - 10.1016/j.apsusc.2021.151041
M3 - Article
AN - SCOPUS:85113459471
SN - 0169-4332
VL - 569
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 151041
ER -