Kinetics, products, and mechanism for the reaction of E −CF 3 CH=CHC 2 F 5 with OH radicals in gas phase and atmospheric implications

Abstract E –CF 3 CH=CHC 2 F 5 is a promising substance that could be used as high temperature bump working fluid. In this study, the rate constants ( k 1 ) for the reaction of E −CF 3 CH=CHC 2 F 5 with OH were measured by the relative rate method: k 1 (298 K) = (9.10 ± 0.29) × 10 −14 and k 1 (253–328 K) = (7.56 ± 0.88) × 10 −13 exp [−(632 ± 35)/T] cm 3 molecule −1  s −1 . The atmospheric lifetime of E −CF 3 CH=CHC 2 F 5 was estimated to be 127 d, while its radiative efficiency (RE) was evaluated to be 0.198 W m −2  ppb −1 . The estimated POCPs of E −CF 3 CH=CHC 2 F 5 were estimated to be 0.5 and 0.2 for North-west European and USA urban conditions, respectively. The 20, 100, and 500-year time horizon global warming potentials (GWPs) of E −CF 3 CH=CHC 2 F 5 were estimated to be 73, 20, and 6, respectively. CF 3 OOOCF 3 , CF 3 OOOC 2 F 5 , COF 2 , CO, and CO 2 were identified as the carbon-containing products following the degradation of E –CF 3 CH=CHC 2 F 5 .