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An Investigation of the Reactivity of OH With Fluoroethanes: CH3CH2F (HFC-161), CH2FCH2F (HFC-152), and CH3CHF2 (HFC-152a)



S N. Kozlov, Vladimir L. Orkin, Michael J. Kurylo III


Rate constants for the reactions of OH radicals with fluoroethane, 1,2-difluoroethane, and 1,1-difuoroethane were measured using the flash photolysis resonance-fluorescence technique over the temperature range 210 K to 480 K. Arrhenius plots for all three reactions exhibit a noticeable curvature and the rate constants are well represented by three-parameter modified Arrhenius expressions over the full experimental temperature range with better than 3% precision.kCH3CH2F (T)= 3.14 x 10-13 x (T/298)^2.45^exp{-103/T} cm3 molecule-1 S-1,kCH2FCH2F (T)=4.33 x 10-14 x (T/298)3.85exp {+247/T} cm3 molecule-1s-1,kCH3CHF2 (T) = 7.72 x 10-14 x (T/298)3.02exp{-247/T} cm3 molecule-1 s-1.For the temperature range of atmospheric interest (TkCH3CH2F (T -13 exp {-730x(1/T- 1/298)} cm3 molecule-1 s-1 S-1,kCH2FCH2F (T-14 exp {-730x(q/T - 1/298)} xm3 molecule-1S-1,kCH3CHF2 (T-14 exp {-990x(1/T - 1/298)} cm3 molecule-1 s-1.Using these recommendations, atmospheric lifetimes were estimated to be ca. 2.4 months, 5.5 months, and 1.4 years for CH3CH2F, CH2FCH2F, and CH3CHF2, respectively.
Journal of Physical Chemistry A
No. 13


atmospheric lifetime, CH<sub>2</sub>FCH<sub>2</sub>F (HFC-152), CH<sub>3</sub>CH<sub>2</sub>F HFC-161, CH<sub>3</sub>CHF<sub>2</sub> HFC-152a, hydroxyl radical


Kozlov, S. , Orkin, V. and Kurylo, M. (2003), An Investigation of the Reactivity of OH With Fluoroethanes: CH<sub>3</sub>CH<sub>2</sub>F (HFC-161), CH<sub>2</sub>FCH<sub>2</sub>F (HFC-152), and CH<sub>3</sub>CHF<sub>2</sub> (HFC-152a), Journal of Physical Chemistry A (Accessed June 10, 2023)
Created April 1, 2003, Updated February 17, 2017