Atmospheric chemistry for gas-phase reactions of cyc-CF2CF2CF2CHXCHX– (X = H or F) with OH radicals in the temperature range of 253–328 K

• Published in: Atmospheric environment (1994) 2019-10, Vol.215, p.116895, Article 116895
• Main Authors: Guo, Qin, Zhang, Ni, Uchimaru, Tadafumi, Chen, Liang, Quan, Hengdao, Mizukado, Junji
• Format: Article
• Language: English
• Subjects: Atmospheric chemistry; Degradation mechanism; Hydrofluorocyclopentane; OH radicals
• ISSN: 1352-2310; 1873-2844
• DOI: 10.1016/j.atmosenv.2019.116895

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. •kOH (253–328K) of cyc-CF2CF2CF2CH2CH2– were measured using a relative rate method.•The products and mechanism of cyc-CF2CF2CF2CHXCHX– (X = H or F) were investigated.•The radiative efficiency and atmospheric lifetime for cyc-CF2CF2CF2CH2CH2– were obtained.•The estimated POCP and GWPs for cyc-CF2CF2CF2CH2CH2– were evaluated.•The environmental impacts of cyc-CF2CF2CF2CHXCHX– (X = H or F) were discussed.