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外文期刊>Environmental Science & Technology: ES&T
>Atmospheric Chemistry of 2-ethoxy-3,3,4A5-pentafluorotetra-hydro-2,5-bis1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl-furan: Kinetics, Mechanisms, and Products of CI Atom and OH Radical Initiated Oxidation
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Atmospheric Chemistry of 2-ethoxy-3,3,4A5-pentafluorotetra-hydro-2,5-bis1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl-furan: Kinetics, Mechanisms, and Products of CI Atom and OH Radical Initiated Oxidation
Smog chamber/FTIR techniques were used to study the atmospheric chemistry of the title compound which we refer to as R_fOC2H5. Rate constants of MCI + R_fOC2H5) = (2.70 +- 0.36) x 10~(-12), *(OH +R_fOC2H5) = (5.93 +- 0.85) x 10~(-14), and MCI + flfOCHO) = (1.34 +-0.20) x 10~(-14) cm~3 molecule"1 s~(_1) were measured in 700 Torr of N2, or air, diluent at 294 +- 1 K. From the value of MOH + R_fOC2H5) the atmospheric lifetime of R_fOC2H5 was estimated to be 1 year. Two competing loss mechanisms forR_fOCH(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 k_O_2/feiss = (1-26 +-0.74) x 10~(-19) cm~3 molecule~(-1). The OH radical initiated atmospheric oxidation of-R_fOC2H5 gives fff0CH0 and fif0C(0)CH3 as major products.R_fOC2H5 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 R_fOC2H5.
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