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Measurement of the rate coefficient of the reaction CH+O 2 → products in the temperature range 2200 to 2600 K
Author(s) -
Röhrig Michael,
Petersen Eric L.,
Davidson David F.,
Hanson Ronald K.,
Bowman Craig T.
Publication year - 1997
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/(sici)1097-4601(1997)29:10<781::aid-kin7>3.0.co;2-i
Subject(s) - chemistry , atmospheric temperature range , range (aeronautics) , temperature coefficient , thermodynamics , analytical chemistry (journal) , organic chemistry , aerospace engineering , physics , quantum mechanics , engineering
The rate coefficient of the reaction CH+O 2 → products was determined by measuring CH‐radical concentration profiles in shock‐heated 100–150 ppm ethane/1000 ppm O 2 mixtures in Ar using cw, narrow‐linewidth laser absorption at 431.131 nm. Comparing the 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: $$k_{\rm{CH}+\rm{O}_{2}} = 10^{(13.99 \pm 0.12)} \hbox{ cm}^{3} \hbox{ mol}^{-1} \hbox{ s}^{-1}$$ The experimental conditions were chosen such that the calculated profiles were sensitive mainly to the reactions CH+O 2 → products and CH 3 +M → CH+H 2 +M. For the methyl decomposition reaction channel, the following rate‐coefficient expression provided the best fit of the measured CH profiles: $$k_{\rm{CH}_{3}+\rm{M}\rightarrow \rm{CH}+\rm{H}_{2}+\rm{M}} = 10^{(16.00 \pm 0.12)} \hbox{ exp($-$42900 K/\it T \rm) cm}^{3} \hbox{ mol}^{-1} \hbox{ s}^{-1}$$ Additionally, the rate coefficient of the reaction CH 2 +H→CH+H 2 was determined indirectly in the same system: $$k_{\rm{CH}_{2}+\rm{H}} = 10^{14.15(+0.2,-0.6)} \hbox{ cm}^{3} \hbox{ mol}^{-1} \hbox{ s}^{-1}$$ © 1997 John Wiley & Sons, Inc.