Gas-phase reactivity study of a series of hydrofluoroolefins (HFOs) toward OH radicals and Cl atoms at atmospheric pressure and 298 K

CARMEN M. TOVAR, MARÍA B. BLANCO, IAN BARNES, PETER WIESEN AND MARIANO A. TERUEL

ATMOSPHERIC ENVIRONMENT

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2014 vol. 88 p. 107 - 107

1352-2310

n order to assess the environmental impact of possible candidates as hydrofluoroolefins to replace the CFCs in the industry, it is necessary to perform kinetic and products studies of their degradation in the air initiated by the main tropospheric oxidants. In this sense, the relative-rate technique has been used to determine rate coefficients for the reactions of 2-fluoropropene(CH3CF=CH2); 3,3,3-trifluoro-2-(trifluoromethyl)propene ((CF3)2C=CH2) and (E/Z)-1,2,3,3,3-pentafluoropropene ((E/Z)-CF3CF=CHF) with OH radicals and Cl atoms at (298 ± 3) K and (760 ± 10) Torr total pressure of synthetic air using different reference compounds. The experiments were performed in an environmental chamber with in situ FTIR spectroscopy to monitor the concentration-time profiles of the reactants. The following room temperature rate coefficients (in cm3 molecule-1 s-1) were obtained: k1(OH + CH3CF=CH2) = (1.55 ± 0.39) × 10-11, k2 (OH + (CF3)2C=CH2) = (6.58 ± 2.25) ×10-13 , k3 (OH + (E/Z-CF3CF=CHF