Heavy Duty Diesel Engine Exhaust Aerosol Particle and Ion Measurements

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• 作者：Tero Lä ; hde ; Topi Rö ; nkkö ; Annele Virtanen ; Tanja J. Schuck ; Liisa Pirjola ; Kaarle Hä ; meri ; Markku Kulmala ; Frank Arnold ; Dieter Rothe ; Jorma Keskinen
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：January 1, 2009
• 年：2009
• 卷：43
• 期：1
• 页码：163-168
• 全文大小：241K
• 年卷期：v.43,no.1(January 1, 2009)
• ISSN：1520-5851

文摘

Heavy duty EURO 4 diesel engine exhaust particle and ion size distributions were measured at the tailpipe using dynamometer testing. Measurements of particle volatility and electrical charge were undertaken to clarify diesel exhaust nucleation mode characteristics with different exhaust after-treatment systems. Nucleation mode particle volatility and charging probability were dependent on exhaust after-treatment: particles were volatile and uncharged when the engine was equipped with diesel particulate filter and partly volatile and partly charged in exhaust without any after-treatment or with an oxidation catalyst only. The absence of charged particles in the nucleation mode of diesel particulate filtered exhaust excludes the ion mediated process as a nucleation particle formation mechanism.