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2008-01-23
Atmospheric chemistry of trans-CF<sub>3</sub>CH=CHF: products and mechanisms of hydroxyl radical and chlorine atom initiated oxidation
M. S. Javadi
R. Søndergaard
O. J. Nielsen
M. D. Hurley
T. J. Wallington
Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
System Analytics and Environmental Sciences Department, Ford Motor Company, Mail Drop RIC-2122, Dearborn, MI 48121-2053, USA
Smog chamber/FTIR techniques were used to study the products and mechanisms
of OH radical and Cl atom initiated oxidation of trans-CF<sub>3</sub>CH=CHF in 700 Torr
of N<sub>2</sub>/O<sub>2</sub> diluent at 295±1 K. Hydroxyl radical initiated
oxidation leads to the formation of CF<sub>3</sub>CHO and HC(O)F in yields which
were indistinguishable from 100% and were not dependent on the O<sub>2</sub>
partial pressure. Chlorine atom initiated oxidation gives HC(O)F,
CF<sub>3</sub>CHO, CF<sub>3</sub>C(O)Cl, and CF<sub>3</sub>C(O)CHFCl. The yields of
CF<sub>3</sub>C(O)Cl and CF<sub>3</sub>C(O)CHFCl increased at the expense of HC(O)F and
CF<sub>3</sub>CHO as the O<sub>2</sub> partial pressure was increased over the range
5–700 Torr. The results are discussed with respect to the atmospheric
chemistry and environmental impact of trans-CF<sub>3</sub>CH=CHF.
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