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Kinetic studies of the reaction of C2H5 with O2 at 295 K

✍ Scribed by I. C. Plumb; K. R. Ryan

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
885 KB
Volume
13
Category
Article
ISSN
0538-8066

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✦ Synopsis

The reaction between CzH5 and 0 2 a t 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 f 0.3) X cm3/s as [He] was increased from 2 X 10I6 to 3.4 X 1017

The importance of to (3.6 f 0.9)

has been determined from a knowledge of the initial CzHs concentration together with a measurement of the CzH4 produced in reaction (5). F, the fraction of the C2Hs radicals removed by path (5), was found to decrease from 0.15 to 0.06 as [He] increased from 2 X 10I6 to 3.4 X 1017

The rate coefficient for reaction (5) was found to be independent of [He] and to have a value of (2.1 f 0.5) X cm3/s. The variation in F reflects the fact that k Ib increases as [He] increases. These observations are taken as evidence for a direct mechanism for C2H4 production and a collision-stabilized route for CzH5O2 formation. Calculations indicate that the high-pressure limit for reaction ( l b ) is -4.4 X cm3/s and that in the polluted troposphere the branching ratio for reactions ( l b ) and (5) will be -20.

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