Issue 19, 2010
From the journal:

Physical Chemistry Chemical Physics

Atmospheric chemistry of C4F9OC2H5 (HFE-7200), C4F9OCH3 (HFE-7100), C3F7OCH3 (HFE-7000) and C3F7CH2OH: temperature dependence of the kinetics of their reactions with OH radicals, atmospheric lifetimes and global warming potentials

Iván Bravo,*a   Yolanda Díaz-de-Mera,a   Alfonso Aranda,a   Kevin Smith,b   Keith P. Shinec  and  George Marstond  

* Corresponding authors

a Physical Chemistry Department, University of Castilla–La Mancha, Chemistry Faculty, Avda. Camilo Jose Cela 10, 13071 Ciudad Real, Spain
E-mail: ivan.bravo@uclm.es

b Space Science and Technology Department, Rutherford Appleton Laboratory, Didcot, Oxon, UK

c Department of Meteorology, University of Reading, Earley Gate PO Box 243, Reading RG6 6BB, UK

d Department of Chemistry, University of Reading, Whiteknights, PO Box 224, Reading RG6 6AD, UK

Abstract

The atmospheric chemistry of several gases used in industrial applications, C4F9OC2H5 (HFE-7200), C4F9OCH3 (HFE-7100), C3F7OCH3 (HFE-7000) and C3F7CH2OH, has been studied. The discharge flow technique coupled with mass-spectrometric detection has been used to study the kinetics of their reactions with OH radicals as a function of temperature. The infrared spectra of the compounds have also been measured. The following Arrhenius expressions for the reactions were determined (in units of cm3 molecule−1 s−1): k(OH + HFE-7200) = (6.9+2.3−1.7) × 10−11 exp(−(2030 ± 190)/T); k(OH + HFE-7100) = (2.8+3.2−1.5) × 10−11 exp(−(2200 ± 490)/T); k(OH + HFE-7000) = (2.0+1.2−0.7) × 10−11 exp(−(2130 ± 290)/T); and k(OH + C3F7CH2OH) = (1.4+0.3−0.2) × 10−11 exp(−(1460 ± 120)/T). From the infrared spectra, radiative forcing efficiencies were determined and compared with earlier estimates in the literature. These were combined with the kinetic data to estimate 100-year time horizon global warming potentials relative to CO2 of 69, 337, 499 and 36 for HFE-7200, HFE-7100, HFE-7000 and CF3CF2CF2CH2OH, respectively.

Graphical abstract: Atmospheric chemistry of C4F9OC2H5 (HFE-7200), C4F9OCH3 (HFE-7100), C3F7OCH3 (HFE-7000) and C3F7CH2OH: temperature dependence of the kinetics of their reactions with OH radicals, atmospheric lifetimes and global warming potentials

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Article information

DOI
https://doi.org/10.1039/B923092K
Article type
Paper
Submitted
04 Nov 2009
Accepted
08 Mar 2010
First published
29 Mar 2010

Phys. Chem. Chem. Phys., 2010,12, 5115-5125

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Atmospheric chemistry of C4F9OC2H5 (HFE-7200), C4F9OCH3 (HFE-7100), C3F7OCH3 (HFE-7000) and C3F7CH2OH: temperature dependence of the kinetics of their reactions with OH radicals, atmospheric lifetimes and global warming potentials

I. Bravo, Y. Díaz-de-Mera, A. Aranda, K. Smith, K. P. Shine and G. Marston, Phys. Chem. Chem. Phys., 2010, 12, 5115 DOI: 10.1039/B923092K

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