Effect of Diesel Oxidation Catalysts on the Diesel Paniculate Filter Regeneration Process

摘要

A Diesel Parbculate Filter (DPF) regeneration process was investigated during aftertreatment exhaust of a simulated diesel engine under the influence of a Diesel Oxidation Catalyst (DOC). Aerosol mass spectrometry analysis showed that the presence of the DOC decreases the Organic Carbon (OC) fraction adsorbed to soot particles. The activation energy values determined for soot nanoparticles oxidation were 97 ± 5 and 101 ± 8 kj mol~(-1) with and without the DOC, respectively; suggesting that die DOC does not facilitate elementary carbon oxidation. The minimum temperature necessary for DPF regeneration was strongly affected by die presence of the DOC in the aftertreatment The conversion of NO to NO_2 inside die DOC induced die DPF regeneration process at a lower temperature dun O_2 (ΔT=30 K). Also, it was verified tfut die OC fraction, which decreases in the presence of die DOC, plays an important role to ignite soot combustion.