Single Pulse Shock Tube Study of Allyl Radical Recombination
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Abstract
The
recombination and disproportionation of allyl radicals has
been studied in a single pulse shock tube with gas chromatographic
measurements at 1–10 bar, 650–1300 K, and 1.4–2
ms reaction times. 1,5-Hexadiene and allyl iodide were used as precursors.
Simulation of the results using derived rate expressions from a complementary
diaphragmless shock tube/laser schlieren densitometry study provided
excellent agreement with precursor consumption and formation of all
major stable intermediates. No significant pressure dependence was
observed at the present conditions. It was found that under the conditions
of these experiments, reactions of allyl radicals in the cooling wave
had to be accounted for to accurately simulate the experimental results,
and this unusual situation is discussed. In the allyl iodide experiments,
higher amounts of allene, propene, and benzene were found at lower
temperatures than expected. Possible mechanisms are discussed and
suggest that iodine containing species are responsible for the low
temperature formation of allene, propene, and benzene