Forskning ved Københavns Universitet - Københavns Universitet


Atmospheric chemistry of 2-ethoxy-3,3,4,4,5-pentafluorotetrahydro-2,5- bis[1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl]-furan: Kinetics, mechanisms, and products of CI atom and OH radical initiated oxidation

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Smog chamber/FTIR techniques were used to study the atmospheric chemistry of the title compound which we refer to as RfOC2H 5. Rate constants of k(CI + RfOC2H5) = (2.70 ± 0.36) ± 10-12, k(OH + RfOC 2H5) = (5.93 ± 0.85) ± 10-14, and k(CI + RfOCHO) = (1.34 ± 0.20) × 10-14 cm3 molecule-1 s-1 were measured in 700 Torr of N2, or air, diluent at 294 ± 1 K. From the value of k(OH + RfOC2H5) the atmospheric lifetime of R fOC2H5 was estimated to be 1 year. Two competing loss mechanisms for RfOCH(O)CH3 radicals were identified in 700 Torr of N2/O2 diluent at 294 ± 1 K; decomposition via C-C bond scission giving a formate (R fOCHO), or reaction with O2 giving an acetate (R fOC(O)-CH3). In 700 Torr of N2/O2 diluent at 294 ± 1 K the rate constant ratio k02/k diss = (1.26 ± 0.74) × 10-19 cm3 molecule-1. The OH radical initiated atmospheric oxidation of R f-OC2H5 gives RfOCHO and R fOC(O)CH3 as major products. Rf-OC 2H5 has a global warming potential of approximately 55 for a 100 year horizon. The results are discussed with respect to the atmospheric chemistry and environmental impact of RfOC2H5.

TidsskriftEnvironmental Science and Technology
Udgave nummer21
Sider (fra-til)7389-7395
Antal sider7
StatusUdgivet - 1 nov. 2007

ID: 223680715