
Journal of Physical Chemistry A p. 7255 - 7260 (2000)
Update date:2022-08-28
Topics:
Mashino
Ninomiya
Kawasaki
Wallington
Hurley
Smog chamber/FTIR techniques were used to study the OH radical, the Cl atom, and ozone initiated oxidation of CF3CF double bond CF2 in 700 Torr of air at 296 K. Relative rate methods were used to measure k(OH+CF3CF double bond CF2) = (2.4±0.3)×10-12 and k(Cl+CF3CF double bond CF2) = (2.7±0.3)×10-11; absolute techniques were used to derive an upper limit of k(O3+CF3CF double bond CF2)<3×10-21 cm3 molecule-1 s-1. OH radical and Cl atom-initiated atmospheric oxidation of CF3CF double bond F2 gives COF2 and CF3C(O)F in molar yields of 100%. The atmospheric lifetime of CF3CF double bond CF2 is approximately 9 days with degradation proceeding via reaction with OH radicals to give trifluoroacetic acid in a molar yield of 100%. Results are discussed with respect to previous measurements of k(OH+CF3CF double bond CF2) and k(O3+CF3CF double bond CF2) and the potential importance of CF3CF double bond CF2 as a source of trifluoroacetic acid.
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