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| Titel |
Effect of atmospheric aging on volatility and reactive oxygen species of biodiesel exhaust nano-particles |
| VerfasserIn |
A. M. Pourkhesalian, S. Stevanovic, M. M. Rahman, E. M. Faghihi, S. E. Bottle, A. R. Masri, R. J. Brown, Z. D. Ristovski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 16 ; Nr. 15, no. 16 (2015-08-17), S.9099-9108 |
| Datensatznummer |
250119969
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| Publikation (Nr.) |
 copernicus.org/acp-15-9099-2015.pdf |
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| Zusammenfassung |
| In the prospect of limited energy resources and climate change, effects of
alternative biofuels on primary emissions are being extensively studied. Our
two recent studies have shown that biodiesel fuel composition has a
significant impact on primary particulate matter emissions. It was also shown
that particulate matter caused by biodiesels was substantially different from
the emissions due to petroleum diesel. Emissions appeared to have higher
oxidative potential with the increase in oxygen content and decrease of
carbon chain length and unsaturation levels of fuel molecules. Overall, both
studies concluded that chemical composition of biodiesel is more important
than its physical properties in controlling exhaust particle emissions. This
suggests that the atmospheric aging processes, including secondary organic
aerosol formation, of emissions from different fuels will be different as
well. In this study, measurements were conducted on a modern common-rail
diesel engine. To get more information on realistic properties of tested
biodiesel particulate matter once they are released into the atmosphere,
particulate matter was exposed to atmospheric oxidants, ozone and
ultra-violet light; and the change in their properties was monitored for
different biodiesel blends. Upon the exposure to oxidative agents, the
chemical composition of the exhaust changes. It triggers the cascade of
photochemical reactions resulting in the partitioning of semi-volatile
compounds between the gas and particulate phase. In most of the cases, aging
lead to the increase in volatility and oxidative potential, and the increment
of change was mainly dependent on the chemical composition of fuels as the
leading cause for the amount and the type of semi-volatile compounds present
in the exhaust. |
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