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Rate of the reaction of hydroxyl radical with acetylene
Author(s) -
André Pastrana V.,
Carr Robert W.
Publication year - 1974
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550060414
Subject(s) - chemistry , radical , hydroxyl radical , reaction rate constant , analytical chemistry (journal) , acetylene , kinetics , nitrogen dioxide , stoichiometry , torr , thermodynamics , organic chemistry , physics , quantum mechanics
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 + NO 2 → OH + NO. The concentration of hydroxyl was followed by line absorption photometry at 308.939 nm and 308.328 nm. Second‐order rate coeffcients were determined in two sets of experiments. The initial concentration ratio [C 2 H 2 ] 0 /[OH] 0 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. Values of thesecond‐order rate coefficient obtained were nk 5 = (2.9 ± 0.3) × 10 −13 cm 3 /molec‐sec in the first set, and nk 5 = (2.1 ± 0.6) × 10 −13 cm 3 /molec‐sec in the second set, where n is the stoichiometric coefficient of OH. A value of the bimolecular rate constant k 5 = (2.0 ± 0.6) × 10 −13 cm/molec‐sec is consistent with both sets of data, as well as an earlier determination.