Catalytic Performance Degradation Characteristics and Characterization of CDPF in Laboratory Hydrothermal Aging and Diesel Vehicle Durability Aging

Abstract

As emissions regulations become increasingly stringent in recent years, the Durability of DPF become more and more important. In this paper, Catalytic performance degradation characteristics of CDPF applied on diesel vehicle durability aging (CDPF was carried out sixty-thousand-kilometer durable ageing) and laboratory hydrothermal aging were studied. The aging of the DPF was analyzed by XRD/XPS sample characterization and sample activity evaluation. The results showed that the crystallinity of diesel vehicle durability CDPF (Used), were higher than that of fresh samples (Fresh) and laboratory aging samples (Aged). The Pt atoms concentration ratio on the surface of Fresh, Aged and Used samples showed a decreasing tendency, which were 1.34%, 0.80% and 0.43% respectively. The concentrations of Pt4+ in high oxidation state also showed a decreasing trend, which were 0.70%, 0.38% and 0.23% respectively. The Aged and Used samples of CDPF presented oxidative activity degradation on CO and C3H8. There was strong correlation between activity degradation and reduced rate of precious metals on the carrier surface.