Kinetics, products, and mechanism for the reaction of E−CF3CH=CHC2F5 with OH radicals in gas phase and atmospheric implications

Publication date: July 2018
Source:Atmospheric Environment, Volume 185
Author(s): Qin Guo, Ni Zhang, Tadafumi Uchimaru, Liang Chen, Hengdao Quan, Junji Mizukado
E–CF3CH=CHC2F5 is a promising substance that could be used as high temperature bump working fluid. In this study, the rate constants (k1) for the reaction of E−CF3CH=CHC2F5 with OH were measured by the relative rate method: k1 (298 K) = (9.10 ± 0.29) × 10⁻¹⁴ and k1 (253–328 K) = (7.56 ± 0.88) × 10⁻¹³ exp [−(632 ± 35)/T] cm³ molecule⁻¹ s⁻¹. The atmospheric lifetime of E−CF3CH=CHC2F5 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−CF3CH=CHC2F5 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−CF3CH=CHC2F5 were estimated to be 73, 20, and 6, respectively. CF3OOOCF3, CF3OOOC2F5, COF2, CO, and CO2 were identified as the carbon-containing products following the degradation of E–CF3CH=CHC2F5.



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