Volatile properties of particles emitted by compressed natural gas and diesel buses during steady-state and transient driving modes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • E. R. Jayaratne
  • N. K. Meyer
  • Z. D. Ristovski
  • L. Morawska

Detail(s)

Original languageEnglish
Pages (from-to)196-203
Journal / PublicationEnvironmental Science and Technology
Volume46
Issue number1
Publication statusPublished - 3 Jan 2012
Externally publishedYes

Abstract

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 utilizing 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 100 and 250 °C, respectively. Closer analysis of the volatility of particles emitted during transient cycles showed that volatilization began at around 40 °C, with the majority occurring by 80 °C. Particles produced during hard acceleration from rest exhibited lower volatility than those produced during other times of the cycle. On the basis of our results and the observation of ash deposits on the walls of the tailpipes, we suggest that these nonvolatile particles were composed mostly of ash from lubricating oil. Heating the diesel bus emissions to 100 °C removed ultrafine particle numbers by 69-82% when a nucleation mode was present and just 18% when it was not. © 2011 American Chemical Society.

Citation Format(s)

Volatile properties of particles emitted by compressed natural gas and diesel buses during steady-state and transient driving modes. / Jayaratne, E. R.; Meyer, N. K.; Ristovski, Z. D.; Morawska, L.

In: Environmental Science and Technology, Vol. 46, No. 1, 03.01.2012, p. 196-203.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review