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Kinetics of the reaction Cl + CH4 → CH3+ HCl from 200° to 500deg;K

✍ Scribed by Mark S. Zahniser; Bruce M. Berquist; Frederick Kaufman

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
795 KB
Volume
10
Category
Article
ISSN
0538-8066

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✦ Synopsis

The rate constant for the reaction C1+ CH, 1 , CH3 + HCl has been determined over the temperature range of 200"-500"K using a discharge flow system with resonance fluorescence detection of atomic chlorine under conditions of large excess CH4. For 300" > 7' > 200°K the data are best fitted to the expression kl = (8.

Curvature is observed in the Arrhenius plot such that the effective activation energy increases from 2.6 kcal/mol at 200" < T < 300°K to 3.5 kcal/mol at 360" < T < 500°K. The data over the entire range may be fitted by the expression k l = 8.6 X T2." exp[-795/T]. These results are compared with other experimental studies and with a semiempirical transition state calculation. Their atmospheric significance is discussed.

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