title: Atmospheric Chemistry of 1H-Heptafluorocyclopentene (cyc-CF2CF2CF2CF═CH-): Rate Constant, Products, and Mechanism of Gas-Phase Reactions with OH Radicals, IR Absorption Spectrum, Photochemical Ozone Creation Potential, and Global Warming Potential.
abstract: The rate constant for gas-phase reactions of OH radicals with 1H-heptafluorocyclopentene (cyc-CF2CF2CF2CF═CH-) was measured using a relative rate method at 298 K: (5.20 ± 0.09) × 10-14cm3molecule-1s-1. The quoted uncertainty includes two standard deviations from the least-squares regression, the systematic error from the GC analysis, and the uncertainties of the rate constants of the reference compounds. The OH-radical-initiated oxidation of cyc-CF2CF2CF2CF═CH- gives the main products COF2, CO, and CO2, leading to negligible environmental impact. For consumptions of cyc-CF2CF2CF2CF═CH- of less than 54%, the yield of the formation of ([COF2] + [CO] + [CO2])/5 (based on the conservation of carbon) was 0.99 ± 0.02, which is very close to 100%. A possible degradation mechanism was proposed. The radiative efficiency (RE) of cyc-CF2CF2CF2CF═CH- measured at room temperature was 0.215 W m-2ppb-1. The atmospheric lifetime of cyc-CF2CF2CF2CF═CH- was calculated as 0.61 year, and the photochemical ozone creation potential (POCP) was negligible. The 20-, 100-, and 500-year time horizon global warming potentials (GWPs) were estimated as 153, 42, and 12, respectively.
authors.affiliation: School of Chemical Engineering and Technology, Xi'an Jiaotong University , No. 28, Xianning West Road, Xi'an, Shaanxi 710049, P. R. China.
authors.forename: Dongpeng
authors.initials: D
authors.lastname: Liu
authors.affiliation: Zhejiang Research Institute of Chemical Industry , No. 387, Tianmushan Road, Hangzhou, 310023, P. R. China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Qin
authors.affiliation: Zhejiang Research Institute of Chemical Industry , No. 387, Tianmushan Road, Hangzhou, 310023, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.affiliation: Zhejiang Research Institute of Chemical Industry , No. 387, Tianmushan Road, Hangzhou, 310023, P. R. China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Zhejiang Research Institute of Chemical Industry , No. 387, Tianmushan Road, Hangzhou, 310023, P. R. China.
authors.forename: Zhikai
authors.initials: Z
authors.lastname: Guo