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Rate Coefficient for the Gas‐Phase OH + CHF=CF 2 Reaction between 212 and 375 K
Author(s) -
Baasandorj Munkhbayar,
Burkholder James B.
Publication year - 2016
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21027
Subject(s) - chemistry , arrhenius equation , analytical chemistry (journal) , torr , radical , atmospheric temperature range , reaction rate constant , photodissociation , activation energy , thermodynamics , kinetics , photochemistry , organic chemistry , physics , quantum mechanics
Rate coefficients, k (T), for the OH + CHF=CF 2 (trifluoroethylene, HFO‐1123) gas‐phase reaction were measured under pseudo–first‐order conditions using pulsed laser photolysis to produce OH radicals and pulsed laser induced fluorescence to measure the OH radical temporal profile. Rate coefficients were measured over the temperature range 212–375 K at total pressures between 20 and 500 Torr (He, N 2 bath gas). The rate coefficient was found to be independent of pressure over this range of pressure with a temperature dependence that is described by the Arrhenius expression (3.04 ± 0.30) × 10 –12 exp[(312 ± 25)/ T ] cm 3 molecule –1 s – 1 with k (296 K) measured to be (8.77 ± 0.80) × 10 –12 cm 3 molecule –1 s – 1 (quoted uncertainties are 2σ and include estimated systematic errors). Rate coefficients for the reaction of CHF=CF 2 with 18 OH and OD were also measured as part of this study at 296 and 373 K and a total pressure of ∼25 Torr (He). The isotope measurements were used to evaluate the observed OH radical regeneration. CHF=CF 2 is a very short‐lived substance with an atmospheric lifetime of ∼1 day with respect to OH reactive loss, whereas the actual lifetime of CHF=CF 2 will depend on the time and location of its emission. The global warming potential for CHF=CF 2 on the 100‐year time horizon (GWP 100 ) was estimated using the present results and a lifetime correction factor to be 3.9 × 10 −3 .