Atmospheric chemistry of CF{sub 3}CFHCF{sub 3} (HFC-227ea): Spectrokinetic investigation of the CF{sub 3}CFO{sub 2}{sup .}CF{sub 3} radical, its reactions with NO and NO{sub 2}, and fate of the CF{sub 3}CFO{sup .}CF{sub 3} radical
- Riso National Lab., Roskilde (Denmark)
- Ford Motor Co., Dearborn, MI (United States)
- Ford Forschungscenter Aachen (Germany)
The ultraviolet absorption spectrum of the CF{sub 3}CFO{sub 2}{sup .}CF{sub 3} radical, the kinetics of its self-reaction and reactions with NO and NO{sub 2} have been studied in the gas phase at 296 K using a pulse radiolysis technique. A long-path-length Fourier transform infrared technique was used to study the fate of the CF{sub 3}CFO{sup .}CF{sub 3} radical. Absorption cross sections for the CF{sub 3}CFO{sub 2}{sup .}CF{sub 3} radical were quantified over the wavelength range 220-270 nm. The rate constant for the CF{sub 3}CFO{sub 2}{sup .}CF{sub 3} self-reaction was determined, as well as those of the reaction of CF{sub 3}CFO{sub 2}{sup .}CF{sub 3} radicals with NO and NO{sub 2}. The atmospheric fate of CF{sub 3}CFO{sup .}CF{sub 3} radicals is decomposition via C-C bond scission to give CF{sub 3} radicals and CF{sub 3}C(O)F. In 1000 mbar of SF{sub 6} at 296 K decomposition of CF{sub 3}CFO{sup .}CF{sub 3} radicals proceeds at a rate greater than 1 x 10{sup 5} s{sup -1}. The results are discussed in the context of the atmospheric chemistry of HFC-227ea. 31 refs., 10 figs., 2 tabs.
- OSTI ID:
- 263208
- Journal Information:
- Journal of Physical Chemistry, Vol. 100, Issue 21; Other Information: PBD: 23 May 1996
- Country of Publication:
- United States
- Language:
- English
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