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Kinetics of Cl(2P) reactions with CF3CHCl2, CF3CHFCl, and CH3CFCl2

✍ Scribed by Rachel F. Warren; A. R. Ravishankara

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 703 KB
Volume: 25
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550251005

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✦ Synopsis

The rate coefficients for the removal of C1 atoms by reaction with three HCFCs, CF3CHC12 (HCFC-123), CF3CHFCl (HCFC-124), and CH3CFC12 (HCFC 141b), were measured as a function of temperature between 276 and 397 K. CH3CF2C1 (HCFC-142b) was studied only a t 298 K. The Arrhenius expressions obtained are: kl = (3.94 i 0.84) X lo-'' exp[-(1740 i 100)/T] cm3 molecule-' s-' for CF3CHC12 (HCFC 123); k2 = (1.16 i 0.41) X exp[-(1800 2 150)/T] cm3 molecule-' s-' for CF3CHFCl (HCFC 124); and k3 = (1.6 2 1.1) X lo-'' exp[-(1800 i 500)/T] cm3 molecule-' s-' for CH3CFC12

(HCFC 141b). In case of HCFC 141b, non-Arrhenius behavior was observed at temperatures above ca. 350 K and is attributed to the thermal decomposition of CHzCFClz product into C1 + CH2CFC1. In case of HCFC-l42b, only an upper limit for the 298 K value of the rate coefficient was obtained. The atmospheric significance of these results are discussed.

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