| Title: | Mechanisms of Increased Particle and VOC Emissions during DPF Active Regeneration and Practical Emissions Considering Regeneration |
| Author(s): | Yamada H; Inomata S; Tanimoto H; |
| Address: | "Environmental Research Division, National Traffic Safety and Environment Laboratory , 7-42-27, Jindaiji-higashimachi, Chofu, Tokyo 182-0012, Japan. Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Mechanisms involved in increased particle and volatile organic compound (VOC) emissions during active and parked active regenerations of a diesel particulate filter (DPF) were investigated using heavy-duty trucks equipped with both a urea selective catalytic reduction system and a DPF (SCR + DPF) and a DPF-only. Particle emissions increased in the later part of the regeneration period but the mechanisms were different above and below 23 nm. Particles above 23 nm were emitted due to the lower filtering efficiency of the DPF because of the decreasing amount of soot trapped during regeneration. Small particles below 23 nm were thought to be mainly sulfuric acid particles produced from SO(2) trapped by the catalyst, being released and oxidized during regeneration. Contrary to the particle emissions, VOCs increased in the earlier part of the regeneration period. The mean molecular weights of the VOCs increased gradually as the regeneration proceeded. To evaluate 'practical emissions' in which increased emissions during the regeneration were considered, a Regeneration Correction Factor (RCF), which is the average emission during one cycle of regeneration/emission in normal operation, was adopted. The RCFs of PM and VOCs were 1.1-1.5, and those of PNs were as high as 3-140, although they were estimated from a limited number of observations" |
| Keywords: | Air Pollutants Motor Vehicles Particle Size *Particulate Matter Regeneration *Vehicle Emissions Volatile Organic Compounds; |
| Notes: | "MedlineYamada, Hiroyuki Inomata, Satoshi Tanimoto, Hiroshi eng 2017/02/06 Environ Sci Technol. 2017 Mar 7; 51(5):2914-2923. doi: 10.1021/acs.est.6b05866. Epub 2017 Feb 27" |
