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Laser photolysis/resonance fluorescence study of the rate constants for the reaction of OH radicals with C/sub 2/H/sub 4/ and C/sub 3/H/sub 6/

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j150649a028· OSTI ID:7050969
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Absolute rate constants for the reactions of OH radicals with (1) C/sub 2/H/sub 4/ and (2) C/sub 3/H/sub 6/ have been measured by using excimer laser photolysis to generate OH and time-resolved resonance fluorescence as its monitor. Reaction 1 was studied at total pressures between 4 and 130 mbar and over the temperature region 296-524 K. k/sub 1/ was found to show a falloff behavior with the extrapolated high-pressure limit given by k/sub 1/ /sup infinity/ (T) = (2.0 +/- 0.8) x 10/sup 12/ exp((320 +/- 150)K/T) cm/sup 3//(mol.s). The observed pressure dependence is consistent with the accepted mechanism OH + C/sub 2/H/sub 4/ in equilibrium C/sub 2/H/sub 4/OH* /sup +M/..-->.. C/sub 2/H/sub 4/OH. Possible modifications of k(p) due to bimolecular product channels are discussed. Reaction 2 was studied at 298 K and total pressures of Ar between 1.3 and 130 mbar. k/sub 2/ is also found to show a falloff behavior. In the limit of high pressure k/sub 2//sup infinity/ = (1.8 +/- 0.3) x 10/sup 13/ cm/sup 3//(mol.s).

Research Organization:
Universitaet Gottingen, Federal Republic of Germany
OSTI ID:
7050969
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:5; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

090110 -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ACETYLENE
ALKENES
ALKYNES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FLUORESCENCE
HYDROCARBONS
HYDROXYL RADICALS
INFORMATION
KINETICS
LASER RADIATION
LUMINESCENCE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PRESSURE DEPENDENCE
PROPYLENE
RADIATIONS
RADICALS
REACTION KINETICS
RESONANCE FLUORESCENCE