Atmospheric chemistry for gas-phase reactions of cyc-CF2CF2CF2CHXCHX- (X = H or F) with OH radicals in the temperature range of 253-328 K
Abstract
Rate constants for the gas-phase reactions of cyc-CF2CF2CF2CH2CH2- with the OH radicals were assessed by a relative rate method in the temperature range of 253-328 K, from which k1(T) = (8.52 ± 1.58) × 10-13 exp [(-1017 ± 53)/T] was derived for the Arrhenius equation. Its atmospheric lifetime was 1.6 years. The estimated photochemical ozone creation potentials (POCP) were 0.211 and 0.076 for North-west European and USA urban conditions, respectively. The radiative efficiency (RE) was measured as 0.200 W m-2 ppb-1, and the global warming potential (GWP) of the 100-year time horizon was estimated to be 107. The atmospheric oxidation mechanism of cyc-CF2CF2CF2CH2CH2- was studied by the experimental method. COF2, CO, and CO2 were identified as the main carbon-containing products. Additionally, the degradation mechanism of two analogous compounds, cyc-CF2CF2CF2CHFCH2- and cis-cyc-CF2CF2CF2CHFCHF-, were also investigated. COF2, HC(O)F, CO, and CO2 were observed as the main products.
- Publication:
-
Atmospheric Environment
- Pub Date:
- October 2019
- DOI:
- 10.1016/j.atmosenv.2019.116895
- Bibcode:
- 2019AtmEn.21516895G
- Keywords:
-
- Hydrofluorocyclopentane;
- Atmospheric chemistry;
- OH radicals;
- Degradation mechanism