Atmospheric chemistry of cyc-CF2CF2CF2CH=CH–: Kinetics, products, and mechanism of gas-phase reaction with OH radicals, and atmospheric implications

Publication date: April 2018
Source:Atmospheric Environment, Volume 179
Author(s): Qin Guo, Ni Zhang, Tadafumi Uchimaru, Liang Chen, Hengdao Quan, Junji Mizukado
The rate constants for the gas-phase reactions of cyc-CF2CF2CF2CH=CH– with OH radicals were determined by a relative rate method between 253 and 328 K. The rate constant k1 at 298 K was measured to be (1.08 ± 0.04) × 10⁻¹³ cm³ molecule⁻¹ s⁻¹, and the Arrhenius expression was k1 = (3.72 ± 0.14) × 10⁻¹³ exp [(−370 ± 12)/T]. The atmospheric lifetime of cyc-CF2CF2CF2CH=CH– was calculated to be 107 d. The products and mechanism for the reaction of cyc-CF2CF2CF2CH=CH– with OH radicals were also investigated. CO, CO2, and COF2 were identified as the main carbon-containing products following the OH-initiated reaction. Moreover, the radiative efficiency (RE) was determined to be 0.143 W m⁻² ppb⁻¹, and the global warming potentials (GWPs) for 20, 100, and 500 yr were 54, 15, and 4, respectively. The photochemical ozone creation potential of the title compound was estimated to be 1.3.

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