Effect of aged on the oxidation of soot over CePrLaxOδ catalysts

The development of highly efficient and stable catalytic oxidation materials is crucial for diesel exhaust aftertreatment systems. In this study, a series of CePrLa x O δ ( x  = 0.1–0.5) catalysts with different lanthanum loadings are synthesized using an impregnation method. The influence of high-temperature aged (12 h at 800 °C) and cyclic aged (6 cycles) on the catalytic performance for soot oxidation is investigated. Characterization results suggest that the introduction of lanthanum effectively inhibits catalyst particle agglomeration and high-temperature sintering, while promoting the formation of oxygen vacancies. The catalytic activity tests indicate that Ce 0.63 Pr 0.07 La 0.3 O δ displays significantly better performance after high-temperature aged and cyclic aged. Compared with the undoped lanthanum, the peak temperature (T p ) is reduced by approximately 190 °C and 128 °C, respectively. The prepared catalyst exhibits outstanding carbon soot oxidation stability, significantly enhancing the aged resistance of CeO 2 -based catalysts. This provides crucial evidence for its practical application in Catalytic Diesel Particulate Filters (CDPFs).