Effects of additives Co, La, and Mn for Pt-based carbon oxidation catalysts

Catalyzed diesel particulate filter (CDPF) systems are viewed as the next generation after-treatment system for the diesel vehicle. The CDPF was coated with Pt catalyst to regenerate particulate matters (PM) continuously. This study was conducted to investigate the PM oxidation catalyst for the CDPF system. The promotional effects of additives Co, La, and Mn for Pt-based carbon oxidation catalysts are investigated by a model gas test. The order of temperature that CO formation happens sharply was Mn < Pt < Pt2 < La < Co, from low temperature to high temperature order. The additive Mn was able to decrease carbon oxidation temperature by 10 °C more than the Pt-only catalyst. The additive Mn has the advantage of generating CO, and it may have the possibility of NOx reduction. Coexistence of both C3H8 and carbon in CDPF (catalyzed DPF) may be helpful to activate the rate of carbon oxidation over the catalyst sites.