Volatile properties of particles emitted by compressed natural gas and diesel buses during steady state and transient driving modes
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2012
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Resumo |
Volatile properties of particle emissions from four compressed natural gas (CNG) and four diesel buses were investigated under steady state and transient driving modes on a chassis dynamometer. The exhaust was diluted utilising a full-flow continuous volume sampling system and passed through a thermodenuder at controlled temperature. Particle number concentration and size distribution were measured with a condensation particle counter and a scanning mobility particle sizer, respectively. We show that, while almost all the particles emitted by the CNG buses were in the nanoparticle size range, at least 85% and 98% were removed at 100ºC and 250ºC, respectively. Closer analysis of the volatility of particles emitted during transient cycles showed that volatilisation began at around 40°C with the majority occurring by 80°C. Particles produced during hard acceleration from rest exhibited lower volatility than that produced during other times of the cycle. Based on our results and the observation of ash deposits on the walls of the tailpipes, we suggest that these non-volatile particles were composed mostly of ash from lubricating oil. Heating the diesel bus emissions to 100ºC removed ultrafine particle numbers by 69% to 82% when a nucleation mode was present and just 18% when it was not. |
Identificador | |
Publicador |
American Chemical Society |
Relação |
DOI:10.1021/es2026856 Jayaratne, Rohan, Ristovski, Zoran, Morawska, Lidia, & Meyer, Nickolas K. (2012) Volatile properties of particles emitted by compressed natural gas and diesel buses during steady state and transient driving modes. Environmental Science and Technology, 46(1), pp. 196-203. http://purl.org/au-research/grants/ARC/DP0985726 |
Direitos |
Copyright 2011 American Chemical Society This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record. |
Fonte |
Faculty of Science and Technology; Institute of Health and Biomedical Innovation; Physics |
Palavras-Chave | #040101 Atmospheric Aerosols #050204 Environmental Impact Assessment #050206 Environmental Monitoring #Vehicle emissions #diesel #CNG #volatile #secondary aerosols |
Tipo |
Journal Article |