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Mechanisms for the formation of exhaust hydrocarbons in a single cyclinder spark-ignition engine fueled with deuterium-labeled ortho- meta- and para-xylene
journal contribution
posted on 2023-06-07, 21:35 authored by D Gregory, Richard Jackson, P J BennettCombustion studies in engines have investigated the chemistry leading to the formation in the exhaust of aromatic hydrocarbons from deuterium-labeled isomeric xylenes. These fuels were: ortho-xylene-d0 and ortho-xylene-d10 (1:1); para-xylene-d0 and para-xylene-d10 (1:1); and meta-xylene-2,4,5,6-d4. Isotopic distributions within the exhausted hydrocarbons establish the postflame chemistry involved. There is an isotope effect in the consumption of residual fuel in the postflame region. The residual fuel from each experiment exhibits minimal H-D exchange. Toluene is an intermediate in the formation of ethylbenzene, and is produced through X• atom (X• = H or D) displacement of methyl radicals from the xylene fuel. Benzene is formed by direct demethylation, but there are other routes. Styrene from o- and p-xylene fuels is formed intramolecularly, probably involving xylylene and methylcycloheptatetraene intermediates. Ethyltoluene is formed by combination of methyl and methylbenzyl radicals.
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- Published
Journal
Combustion and FlamePublisher
Combustion and FlameVolume
118Page range
459-468ISBN
0010-2180Department affiliated with
- Chemistry Publications
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- No
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- Yes
Legacy Posted Date
2012-02-06Usage metrics
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