Kinetics of the reaction of ethyl radicals with molecular oxygen from 294 to 1002 K
The kinetics and mechanism of the reaction of ethyl radicals with molecular oxygen have been studied between 294 and 1002 K. The radicals were produced by the rapid Cl + C/sub 2/H/sub 6/ reaction following the pulsed production of chlorine atoms from the infrared multiple-photon-induced decomposition of CFCl/sub 3/. Reactant and product concentrations were monitored in real-time experiments using photoionization mass spectrometry. Overall rate constants of the C/sub 2/H/sub 5/ + O/sub 2/ reaction were measured near seven temperatures between 294 and 1002 K. In addition, C/sub 2/H/sub 4/ product yields were determined at three different temperatures. Special emphasis was given to obtaining the density dependence of the overall rate constant at four temperatures. The pressure and temperature dependencies of the measured rate constants, the C/sub 2/H/sub 4/ product yields, and the results of prior studies of this reaction are discussed in terms of two mechanisms: one which proceeds by parallel uncoupled routes to C/sub 2/H/sub 5/O/sub 2/ and C/sub 2/H/sub 4/ formation and another which proceeds by coupled routes via a common C/sub 2/H/sub 5/O/sub 2/* intermediate. The experimental findings appear to be more consistent with the coupled-path mechanism.
- Research Organization:
- Illinois Inst. of Tech., Chicago
- DOE Contract Number:
- AC02-78ER14953
- OSTI ID:
- 6409402
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 88:16
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHYL RADICALS
CHEMICAL REACTIONS
OXYGEN
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
HALOGENATED ALIPHATIC HYDROCARBONS
PHOTOLYSIS
TEMPERATURE EFFECTS
ALKYL RADICALS
DATA
DECOMPOSITION
ELEMENTS
INFORMATION
KINETICS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADICALS
REACTION KINETICS
090110* - Hydrocarbon Fuels- Properties- (1979-1989)
400500 - Photochemistry