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

LEONARDO LIZARRAGA; STAMATIOS SOUENTIE; ANTOINETTE BOREAVE; CHRISTIAN GEORGE; BARBARA D'ANNA; PHILIPPE VERNOUX

ENVIRONMENTAL SCIENCE & TECHNOLOGY

AMER CHEMICAL SOC

Lugar: Washington; Año: 2011 vol. 45 p. 10591 - 10597

0013-936X

A Diesel Particulate 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 the DOC does not facilitate elementary carbon oxidation. The minimum temperature necessary for DPF regeneration was strongly affected by the presence of the DOC in the aftertreatment. The conversion of NO to NO2 inside the DOC induced the DPF regeneration process at a lower temperature than O2 (ΔT = 30 K). Also, it was verified that the OC fraction, which decreases in the presence of the DOC, plays an important role to ignite soot combustion.