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- W2023863443 abstract "The atmospheric chemical behaviour of 1,1,1,2-tetrafluoroethane (CF3CFH2, HFC-134a) with respect to its rate and mechanism of degradation in the troposphere has been investigated. The rate coefficient for the reaction of (1 a) CF3CFH2 + OH→CF3CFH + H2O has been determined in direct time-resolved experiments using laser-pulse initiation and laser long-path absorption. A value of k1a = (4.6±0.5)×10−15 cm3/s at T = 295K has been found. The ratio of the rate coefficients for the reactions of the CF3CFHO-radical with O2, (4) CF3CFHO + O2→CF3CFO + HO2, and C-C bond fission, (5) CF3CFHO + M→CFHO + CF3 + M, for T = 295 K and ptotal = 50 mbar (O2) has been obtained to be k4/(k5 [M]) = 1.5×10−19 cm3, with the individual values being k4 = 2.7×10−15 cm3/s and k5 [M] = 1.8×104 s−1. The mechanism of the atmospheric degradation of HFC-134a has been investigated in the temperature range 244-295 K and ptotal = 1000 mbar using UV photolysis/FTIR product studies. From these experiments the Arrhenius expression k4/(k5 [M]) = 8.7±10−25 exp ((3240+990−610) K/T) cm3 was determined. Moreover, it is concluded that the major carbonyl products are CF3CFO, CFHO and CF2O which result from the two possible reactions of the oxy radical CF3CFHO. As a consequence the yield of these carbonyl products is dependent on temperature, O2 partial pressure and total pressure. For the reaction of CFHO with Cl atoms the Arrhenius expression k18 = 5.7×10−14exp (−(1130 ± 160) K/T) cm3/s was determined in the temperature range 244-298 K." @default.
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- W2023863443 date "1996-05-01" @default.
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- W2023863443 title "Rate and Mechanism of the Atmospheric Degradation of 1,1,1,2-Tetrafluoroethane (HFC-134a)" @default.
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- W2023863443 doi "https://doi.org/10.1002/bbpc.19961000503" @default.
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