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5935091 
Journal Article 
Effect of catalyzed diesel particulate filter on gaseous emissions from automobile diesel engine 
Feng, Q; Lou, DM; Tan, PQ; Hu, ZY; Cui, JG 
2014 
1 
Ranliao Huaxue Xuebao
ISSN: 0253-2409 
Science Press 
42 
12 
1513-1521 
Chinese 
In order to research catalytic performance of CDPFs (catalyzed diesel particulate filters) loaded different catalysts, CDPF samples were evaluated through gas flow reactor and full-scale CDPFs tests were conducted in diesel engine bench based on AVL-SESAM (System for emission sampling and measurement) FT-IR. The results show that: the light-off temperature of CO and C3H8 decrease in turn as content of the precious metals increase. The light-off temperatures of CDPFs loaded same proportion of noble metals approximately shows linear dependence, while the difference of light-off temperature may result from different content of same proportion of noble metals. At high temperature condition, synergistic effects of content, proportion, valence state of noble metals and gaseous emission concentrations play obvious role on light-off performance of C3H8. In diesel engine bench test, full-scale CDPFs present lower light-off temperature of CO and THC. Within moderate inlet temperatures, increased Pt aids in oxidization of NO, which is speculated that PdO would help to oxidize NO. The existence of Pd may intensify thermal stability of the catalyst. The oxidized process of NO is inhibited by NO2. Meanwhile O2 concentration in the diesel exhaust also affects oxidization of NO. Higher Pd content in Al2O3 coating increase production of nitrate. With combination of Pt/Pd/Rh, the CDPF loaded lower Pd adsorbs much more SO2 on the catalysts. However, as the temperature increases, CeO2 promotes desorption of SO2 on the catalysts, which leads to the sulfur tolerance of the CDPF. ©, 2014, Science Press. All right reserved. 
CDPF; Diesel engine; Gaseous precursor; Secondary aerosol; Air filters; Aluminum coatings; Automobile engines; Catalysis; Catalysts; Engines; Filters (for fluids); Flow of gases; Fuel filters; Gas emissions; Metals; Particulate emissions; Platinum; Precious metals; Sulfur dioxide; Thermodynamic stability; Catalytic performance; Catalyzed diesel particulate filters; CDPF; Emission concentration; Gaseous precursors; High temperature condition; Light-off temperatures; Secondary aerosols; Diesel engines