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Proceedings Paper

Rates of hydroxyl radical reactions with some HFCs
Author(s): William B. DeMore
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Paper Abstract

Relative rate constants for OH reactions with some HFCs have been determined at 298 K by a technique which measures the loss of HFC compared to that of a reference reactant. The experiments were done in a slow-flow or stopped-flow photochemical reactor. The OH was produced by photolysis of H2O vapor at 185 nm. The HFCs studied were CF2HCF3 (HFC-125), CFH2CF3 (HFC-134a), and CH3CF2H (HFC-152a). Methane and ethane were used as the reference reactants. Concentrations were monitored by FTIR. The following ratios were determined: k(152a)/k(CH4) equals 5.2 +/- 0.5, k(CH4)/k(125) equals 3.9 +/- 0.5, k(CH4)/k(134a) equals 2.1 +/- 0.2, k(134a)/k(125) equals 2.0 +/- 0.2, and k(C2H6)/k(152a) equals 6.2 +/- 1.0. These results are in good agreement with literature values for the absolute rate constants, except for HFC 134a, in which case a slower rate constant (factor of about 1.3) is indicated.

Paper Details

Date Published: 12 February 1993
PDF: 6 pages
Proc. SPIE 1715, Optical Methods in Atmospheric Chemistry, (12 February 1993); doi: 10.1117/12.140207
Show Author Affiliations
William B. DeMore, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 1715:
Optical Methods in Atmospheric Chemistry
Harold I. Schiff; Ulrich Platt, Editor(s)

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