Abstract Understanding the mechanism of carbon oxidation is important for the successful modeling of diesel particulate filter regeneration. Characteristics of soot oxidation were investigated with carbon black (Printex-U). A flow reactor system that could simulate the condition of a diesel particulate filter and diesel exhaust gas was designed. Kinetic constants were derived and the reaction mechanisms were proposed using the experimental results and a simple reaction scheme, which approximated the overall oxidation process in TPO as well as CTO. From the experiments, the apparent activation energy for carbon oxidation with $ NO_{2} $-$ O_{2} $-$ H_{2} $O was determined to be 40±2 kJ/mol, with the first order of carbon in the range of 10∼90% oxidation and a temperature range of 250∼500°C. This value was exceedingly lower than the activation energy of $ NO_{2} $-$ O_{2} $ oxidation, which was 60±3 kJ/mol. When $ NO_{2} $ exists with $ O_{2} $ and $ H_{2} $O, the reaction rate increases in proportion to $ NO_{2} $. It increases nonlinearly with $ O_{2} $ or $ H_{2} $O concentration when the other two oxidants are fixed.
Measurement of soot oxidation with $ No_{2} $-$ O_{2} $-$ H_{2} $O in a flow reactor simulating diesel engine DPF
2008
Article (Journal)
English
BKL: | 55.20$jStraßenfahrzeugtechnik / 55.20 Straßenfahrzeugtechnik |
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