title: Single pulse shock tube study of allyl radical recombination.
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.
authors.affiliation: Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, Illinois 60607, United States.
authors.forename: Aleksandr
authors.initials: A
authors.lastname: Fridlyand
authors.forename: Patrick T
authors.initials: PT
authors.lastname: Lynch
authors.forename: Robert S
authors.initials: RS
authors.lastname: Tranter
authors.forename: Kenneth
authors.initials: K
authors.lastname: Brezinsky
mesh_terms: D000498:Allyl Compounds / Q000737:chemistry*; D002849:Chromatography, Gas; D005609:Free Radicals / Q000737:chemistry; D013696:Temperature
chemical_list: D000498:Allyl Compounds; D005609:Free Radicals