Electronic Resource
New York, NY
:
Wiley-Blackwell
International Journal of Chemical Kinetics
13 (1981), S. 1011-1028
ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The reaction between C2H5 and O2 at 295 K has been studied with a flow reactor sampled by a mass spectrometer. With helium as the carrier gas the rate coefficient was found to increase from (1.2 ± 0.3) × 10-12 to (3.6 ± 0.9) × 10-12 cm3/s as [He] was increased from 2 × 1016 to 3.4 × 1017 cm-3. The importance of has been determined from a knowledge of the initial C2H5 concentration together with a measurement of the C2H4 produced in reaction (5). F, the fraction of the C2H5 radicals removed by path (5), was found to decrease from 0.15 to 0.06 as [He] increased from 2 × 1016 to 3.4 × 1017 cm-3. The rate coefficient for reaction (5) was found to be independent of [He] and to have a value of (2.1 ± 0.5) × 10-13 cm3/s. The variation in F reflects the fact that k1b increases as [He] increases. These observations are taken as evidence for a direct mechanism for C2H4 production and a collision-stabilized route for C2H5O2 formation. Calculations indicate that the high-pressure limit for reaction (1b) is ∼4.4 × 10-12 cm3/s and that in the polluted troposphere the branching ratio for reactions (1b) and (5) will be ∼l20.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550131003
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