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

Published

April 1, 2003

Author(s)

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

Abstract

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^-1_S^-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.

Citation

Journal of Physical Chemistry A

Volume

107

Issue

No. 13

Pub Type

Journals

Keywords

atmospheric lifetime, CH₂FCH₂F (HFC-152), CH₃CH₂F HFC-161, CH₃CHF₂ HFC-152a, hydroxyl radical

Citation

Kozlov, S. , Orkin, V. and Kurylo, M. (2003), An Investigation of the Reactivity of OH With Fluoroethanes: CH₃CH₂F (HFC-161), CH₂FCH₂F (HFC-152), and CH₃CHF₂ (HFC-152a), Journal of Physical Chemistry A (Accessed October 13, 2024)