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Measurement of the rate coefficient of the reaction CH+O2 → products in the temperature range 2200 to 2600 K

✍ Scribed by Michael Röhrig; Eric L. Petersen; David F. Davidson; Ronald K. Hanson; Craig T. Bowman

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
196 KB
Volume
29
Category
Article
ISSN
0538-8066

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✦ Synopsis

The rate coefficient of the reaction was determined by mea-CH ϩ O : products 2 suring CH-radical concentration profiles in shock-heated ethane/ 100-150 ppm 1000 ppm O 2 mixtures in Ar using cw, narrow-linewidth laser absorption at Comparing the 431.131 nm. measured CH concentration profiles to ones calculated using a detailed kinetics model, yielded the following average value for the rate coefficient independent of temperature over the range 2200-2600 K: (13.99 Ϯ 0.12) 3 Ϫ1 Ϫ1 k ϭ 10 cm mol s CHϩO2 The experimental conditions were chosen such that the calculated profiles were sensitive mainly to the reactions and For the methyl CH ϩ O : products CH ϩ M : CH ϩ H ϩ M. 2 3 2 decomposition reaction channel, the following rate-coefficient expression provided the best fit of the measured CH profiles: (16.00 Ϯ 0.12) 3 Ϫ1 Ϫ1 k ϭ 10 exp(Ϫ42900 K/T ) cm mol s CH ϩM: CHϩH ϩM 3 2 Additionally, the rate coefficient of the reaction was determined indi-CH ϩ H : CH ϩ H 2 2 rectly in the same system: 14.15(ϩ0.2,Ϫ0.6) 3 Ϫ1 Ϫ1 k ϭ 10 cm mol s

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