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Rate constants for the reactions of Br atoms with a series of alkanes, alkenes, and alkynes in the presence of O2

✍ Scribed by I. Barnes; V. Bastian; K. H. Becker; R. Overath; Zhu Tong

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 917 KB
Volume: 21
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550210703

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✦ Synopsis

Rate constants of Br atom reactions have been determined using a relative kinetic method in a 20 1 reaction chamber at total pressures between 25 and 760 torr in Nz + Oz diluent over the temperature range 293-355 K. The measured rate constants for the reactions with alkynes and alkenes showed dependence upon temperature, total pressure, and the concentration of O2 present in the reaction system.

(2.7 ? 0.5) x lo-", (3.4 2 0.7) x lo-", and (7.5 2 1.5) x lo-'' (units: cm3 s-') have been obtained as rate constants for the reactions of Br with 2,2,4trimethylpentane, acetylene, propyne, ethene, propene, l-butene, and truns-2-butene, respectively, in 760 tom of synthetic air at 298 K with respect to acetaldehyde as reference, k = 3.6 x lo-'' cm3 s-'.

Formyl bromide and glyoxal were observed as primary products in the reaction of Br with acetylene in air which further react to form CO, HBr, HOBr, and Hz02. Bromoacetaldehyde was observed as an primary product in the reaction of Br with ethene. Other observed products included CO, COz, HBr, HOBr, BrCHO, bromoethanol, and probably bromoacetic acid.

V a l u e s of ( 6 . 8 & 1.4) x (3.6 t 0.7) x

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