๐”– Bobbio Scriptorium
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A shock tube study of reactions of atomic oxygen with isocyanic acid

โœ Scribed by John D. Mertens; Albert Y. Chang; Ronald K. Hanson; Craig T. Bowman

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
780 KB
Volume
24
Category
Article
ISSN
0538-8066

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โœฆ Synopsis

Reactions of atomic oxygen with isocyanic acid (HNCO) have been studied in incident and reflected shock wave experiments using HNCO/NZO/Ar mixtures. Quantitative time-histories of the NH(X38-) and OH(X2n,) radicals were measured behind the shock waves using cw, narrow-linewidth laser absorption at 336 nm and 307 nm, respectively. The second-order rate coefficients of the reactions:

( 2 4 0 + HNCO + NH + COz and (2c) 0 + HNCO --j OH + NCO were determined from early-time NH and OH formation rates, with least-squares twoparameter fits of the results given by: kao = 1.9 x 1013 exp(-7150/T, K) ( f = 0.62, F = 1.52) T = 2120-2500 K and kzc = 1.4 x 1014 exp(-10300/T, K) ( f = 0.65, F = 1.35) T = 2120-3190 K , cm3 mol-' s-'. The minimum and maximum rate constant factors ( L F) define the lower and upper uncertainty limits, respectively. An upper limit on the rate coefficient of (3) was determined to be: OH + HNCO + products k3 5 1.5 x 10" cm3 mol-' s-l, T = 2120-2350 K 0 + HNCO -N H + COz 0 + HNCO -HNO + CO AH& = -43.5 kcal/mol AH&,8 = -37.3 kcal/mol AH& = 12.8 kcal/mol 0 + HNCO -OH + NCO

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