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Rate and mechanism of the atmospheric degradation of 2H-heptafluoropropane (HFC-227)

Zellner, R.; Bednarek, G.; Hoffmann, A.; Kohlmann, J. P.; Mörs, V.; Saathoff, H. ORCID iD icon 1
1 Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF), Karlsruher Institut für Technologie (KIT)


The atmospheric chemical behaviour of 2H-Heptafluoropropane (CF3CHFCF3, HFC-227) with respect to its rate and mechanism of degradation in the troposphere has been investigated. The rate coefficient for the reaction of HFC-227 with OH radicals has been determined in direct time resolved experiments using a combination of laser-pulse initiation and LIF. In the temperature range T=298-463 K the Arrhenius expression k(T) = (3.8±0.8) 10−13 exp(-1596±77K/T) cm3/s, which corresponds to k (298 K) = (1.8±0.3) 10−15cm3/s, was found. The mechanism of the atmospheric degradation of HFC-227 has been investigated using both, laser-pulse initiated/time resolved and UV photolysis/FTIR product studies. It is concluded that the major carbonyl products are CF3COF and CF2O which result from the decomposition of the oxy radical CF3CF(O)CF3 by C-C bond fission. The rate coefficient for this decomposition process has been determined to be k = (2±1) 103s−1 at 298K. Based on the reactivity of HFC-227 with respect to the reaction with OH radicals, the atmospheric lifetime and the GWP value for HFC-227 are estimated to be ∼40 years and 0.6±0.2, respectively.

DOI: 10.1002/bbpc.19940980202
Web of Science
Zitationen: 22
Zitationen: 20
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Aerosolforschung (IMKAAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.1994
Sprache Englisch
Identifikator ISSN: 0005-9021
KITopen-ID: 1000158302
Erschienen in Berichte der Bunsengesellschaft für physikalische Chemie
Verlag John Wiley and Sons
Band 98
Heft 2
Seiten 141–146
Nachgewiesen in Dimensions
Web of Science
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