1. Preparation of Cordierite Monolith Catalysts with the Coating of K-Modified Spinel MnCo 2 O 4 Oxide and Their Catalytic Performances for Soot Combustion.
- Author
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Zhao, Kun, Li, Jianmei, Wang, Lanyi, Li, Dong, Liu, Bonan, Li, Renjie, Yu, Xuehua, Wei, Yuechang, Liu, Jian, and Zhao, Zhen
- Subjects
SELF-propagating high-temperature synthesis ,DIESEL particulate filters ,CORDIERITE ,CATALYSTS ,COMBUSTION ,CHEMICAL properties ,OXIDES - Abstract
Diesel engines are important for heavy-duty vehicles. However, particulate matter (PM) released from diesel exhaust should be eliminated. Nowadays, catalytic diesel particulate filters (CDPF) are recognized as a promising technology. In this work, a series of monolith Mn
1−n Kn Co2 O4 catalysts were prepared by the simple citric acid method. The as-prepared catalysts displayed good catalytic performance for soot combustion and the Mn0.7 K0.3 Co2 O4 catalyst gave the best catalytic performance among all the prepared samples. The T10 and Tm of Mn0.7 K0.3 Co2 O4 -HC catalyst for soot combustion are 310 and 439 °C, respectively. The physical and chemical properties of catalysts were characterized by means of SEM, XPS, H2 -TPR, Raman and other techniques. The characterization results indicate that K substitution is favorable for the formation of oxygen vacancies, enhancing the mobility of active oxygen species, and improving the redox properties and so on. In-situ Raman results prove that the strength of Co-O bonds in the catalysts became weak during the reaction at high temperatures. In addition, SEM and ultrasonic test results show that the peeling rate of the coat-layer is less than 5%. The as-prepared catalysts can be taken as one kind of candidate catalyst for promising application in soot combustion because of its facile synthesis, low cost and high catalytic activity. [ABSTRACT FROM AUTHOR]- Published
- 2022
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