Premium
Atmospheric Chemistry of HCF 2 O(CF 2 CF 2 O) x CF 2 H ( x =2–4): Kinetics and Mechanisms of the Chlorine‐Atom‐Initiated Oxidation
Author(s) -
Sulbaek Andersen Mads P.,
Andersen Vibeke F.,
Nielsen Ole J.,
Sander Stanley P.,
Wallington Timothy J.
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000438
Subject(s) - chemistry , global warming potential , analytical chemistry (journal) , infrared spectroscopy , infrared , nuclear chemistry , physics , greenhouse gas , environmental chemistry , organic chemistry , ecology , optics , biology
Smog chamber/FTIR techniques were used to measure k (Cl+HCF 2 O(CF 2 CF 2 O) x CF 2 H)=(5.3±1.5)×10 −17 cm 3 molecule −1 s −1 in 700 Torr of N 2 /O 2 diluent at 296±1 K. The Cl‐initiated atmospheric oxidation of HCF 2 O(CF 2 CF 2 O) x CF 2 H, x =2,3 and 4, gave COF 2 in molar yields of (593±41) %, (758±71) % and (939±73) %, respectively, with no other observable carbon‐containing products (i.e., essentially complete conversion of the hydrofluoropolyethers into COF 2 ). Quantitative infrared spectra for HCF 2 O(CF 2 CF 2 O) x CF 2 H (x=2–4) were recorded and used to estimate the radiative efficiencies of the title compounds (1.07, 1.33, and 1.36 W m −2 ppb −1 ). Global warming potentials (100 year time horizon) of 3870, 4730 and 5060 were estimated for HCF 2 O(CF 2 CF 2 O) x CF 2 H, x =2, 3 and 4, respectively. The results are discussed with respect to the atmospheric chemistry and environmental impact of hydrofluoropolyethers.