Rates of hydroxyl radical reactions with some HFCs

William B. DeMore

doi:10.1117/12.140207

12 February 1993 Rates of hydroxyl radical reactions with some HFCs

William B. DeMore

Proceedings Volume 1715, Optical Methods in Atmospheric Chemistry; (1993) https://doi.org/10.1117/12.140207
Event: Environmental Sensing '92, 1992, Berlin, Germany

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.

Citation Download Citation

William B. DeMore "Rates of hydroxyl radical reactions with some HFCs", Proc. SPIE 1715, Optical Methods in Atmospheric Chemistry, (12 February 1993); https://doi.org/10.1117/12.140207

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