Preparation of Cordierite Monolith Catalysts with the Coating of K-Modified Spinel MnCo2O4 Oxide and Their Catalytic Performances for Soot Combustion

Diesel engines are important for heavy-duty vehicles. However, particulate matter (PM) released from diesel exhaust should be eliminated. Nowadays, catalytic filters (CDPF) recognized as a promising technology. In this work, series of monolith Mn1−nKnCo2O4 catalysts were prepared by the simple citric acid method. The as-prepared displayed good performance soot combustion and Mn0.7K0.3Co2O4 catalyst gave best among all samples. T10 Tm Mn0.7K0.3Co2O4-HC 310 439 °C, respectively. physical chemical properties characterized means SEM, XPS, H2-TPR, Raman other techniques. characterization results indicate that K substitution is favorable formation oxygen vacancies, enhancing mobility active species, improving redox so on. In-situ prove strength Co-O bonds in became weak during reaction at high temperatures. addition, SEM ultrasonic test show peeling rate coat-layer less than 5%. can taken one kind candidate application because its facile synthesis, low cost activity.