Kinetics of OH radical reactions with a series of symmetric acetals in the temperature range 293–617 K
- 9 November 2001
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 3 (22) , 4939-4945
- https://doi.org/10.1039/b105650f
Abstract
Rate constants of the reactions of OH radicals with dimethoxymethane, diethoxymethane and dipropoxymethane have been measured in the temperature range 293–619 K at a total pressure of 100 Torr. The pulse laser photolysis–laser induced fluorescence technique (PLP-LIF) was used with OH radicals produced by photolysis of H2O2 at λ=266 nm. Combining data so obtained with recent determinations at lower temperatures shows that, for the three acetals, the Arrhenius plots exhibit a minimum. A three-parameter Arrhenius expression reproduces the minimum but the temperature exponent and the preexponential factor have unrealistic values. For the three reactions, a better description of the temperature dependence was obtained by fitting the rate constant by the sum of two functions corresponding to different reaction pathways at low and high temperature.Keywords
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