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Rate of the reaction of hydroxyl radical with acetylene

✍ Scribed by Pastrana V. André; Robert W. Carr JR.

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
429 KB
Volume
6
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of the decay of hydroxyl radicals in the presence of excess acetylene were studied at pressures in the vicinity of 1 torr and at ambient temperature in a tubular discharge-flow reactor. Hydroxyl radicals were produced by the reaction of atomic hydrogen with nitrogen dioxide, H + NOZ + OH + NO. The concentration of hydroxyl was followed by line absorption photometry at 308.939 nm and 308.328 nm. Second-order rate coefficients were determined in two sets of experiments. The initial concentration ratio [C2Hz]o/[OH], was in the range of 2.3 to 13.2 in the first set, and 14 to 125 (owing to greater hydroxyl detection sensitivity) in the second set.

(5) second-order rate coefficient obtained were nkb = (2.9 f 0.3) X cm3/molec-sec in the first set, and nks = (2.1 f 0.6) X I O -I 3 cm3/molec-sec in the second set, where n is the stoichiometric coefficient of OH. A value of the bimolecular rate constant ks = (2.0 f 0.6) X cm/molec-sec is consistent with both sets of data, as well as an earlier determination.

Values of the OH + CzH2 + products

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