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

Autor: Stanley P. Sander, Ole John Nielsen, Mads P. Sulbaek Andersen, Timothy J. Wallington, V. F. Andersen
Rok vydání: 2010
Předmět:
Zdroj: ChemPhysChem. 11:4035-4041
ISSN: 1439-7641
1439-4235
DOI: 10.1002/cphc.201000438
Popis: 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 (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 Wm -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.
Databáze: OpenAIRE
Externí odkaz: