Effect of After-Treatment Systems on Size Distribution of Heavy Duty Diesel Exhaust Aerosol

Kati Vaaraslahti, Annele Virtanen, Jyrki M. Ristimäki, Jorma Keskinen

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

9 Citations (Scopus)


The effect of after-treatment on size distribution of heavy duty diesel exhaust is studied with a measurement system sampling directly from the tailpipe. After-treatment systems studied are diesel particulate filter (DPF), oxidation catalyst, and selective catalytic reduction (SCR) technique. Only low level sulfur fuels are used. DPF effectively reduces accumulation mode particles but the formation of ultrafine particles was observed at high load. Oxidation catalyst and SCR system slightly reduce accumulation mode in low load, probably because of the higher volatile fraction of the particles at low load. At high load, ultrafine particles are formed with both catalyst systems resulting most probably from SO3 formation over the oxidation catalyst. With SCR, possible ammonia slip may also contribute to particle formation.
Original languageEnglish
Article number2004-01-1980
Number of pages8
JournalSAE Technical Paper Series
Publication statusPublished - 8 Jun 2004
MoE publication typeA4 Article in a conference publication
Event2004 SAE Fuels and Lubricants Meeting and Exhibition - Toulouse, France
Duration: 8 Jun 200410 Jun 2004


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