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Rate coefficients for the gas-phase reactions of bromine radicals with a series of alkenes, dienes, and aromatic hydrocarbons at 298 ± 2 K

✍ Scribed by A. Bierbach; I. Barnes; K. H. Becker

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
803 KB
Volume
28
Category
Article
ISSN
0538-8066

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✦ Synopsis

Using the relative kinetic method rate coefficients have been determined for the gas-phase reaction of bromine (Br) radicals with a series of alkenes, chloroalkenes, dienes. and aromatic hydrocarbons in 1000 mbar of synthetic air at 298 ? 2 K. Both the UV photolysis of CH,Br, ( A = 254 n m ) and the visible photolysis of Br, (320 5 A 5 480) were used to generate Br radicals. For the alkenes and dienes the following rate coefficients were obtained ( i n units of cm3 molecule-' s -l ) : trans-2-butene 9.26 ? 1.85, 2-methyl-I-butene 15 20 ? 3.00; 2-methyl-2-butene 19 10 ? 3.80; 2.3-dimethyl-2-butene 28 20 ? 5.60; a-pinene 22 20 ? 4 40, P-pinene 28.60 ? 5.70; 1,3-butadiene 57 50 ? 1 1 50; isoprene 74.20 ? 14.80, and 2.3dimethyl-1.3-butadiene 81.7 ? 16.30. For the chloroalkenes and aromatic hydrocarbons the Following rate coefficients were obtained (in units of 10lp cm3 molecule-l s-I): chloroethene 7.37 2 1.92; I , I-dichloroethene 3.66 ? 0.73; trichloroethene 0.90 ? 0.18; tetrachloroethene 5 0.1; benzene 5 0.10; toluene 5 0.10; p-xylene 5 0.10; and furan 5 0.10 With the exception of 1rans-2-butene. this study represents the first determination of the rate coefficients for all of the compounds. 0

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