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

• Published in: Atmospheric environment (1994) 2018-07, Vol.185, p.7-14
• Main Authors: Guo, Qin, Zhang, Ni, Uchimaru, Tadafumi, Chen, Liang, Quan, Hengdao, Mizukado, Junji
• Format: Article
• Language: English
• Subjects: Degradation mechanism; E−CF3CH=CHC2F5; Global warming potential (GWP); Photochemical ozone creation potential (POCP); Tropospheric lifetime
• ISSN: 1352-2310; 1873-2844
• DOI: 10.1016/j.atmosenv.2018.04.047

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. •kOH (253–328K) of E–CF3CH=CHCF2CF3 were estimated by relative rate method.•The products and mechanism of the OH-initiated oxidation were investigated.•The infrared spectrum, radiative efficiency and atmospheric lifetime were obtained.•POCP and GWPs were evaluated and the environmental impacts were discussed.