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The gas phase reactions of hydroxyl radicals with a series of carboxylic acids over the temperature range 240–440 K

✍ Scribed by Philippe Dagaut; Timothy J. Wallington; Renzhang Liu; Michael J. Kurylo

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
368 KB
Volume
20
Category
Article
ISSN
0538-8066

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✦ Synopsis

The temperature dependencies of the rate constants for the gas phase reactions of OH radicals with a series of carboxylic acids were measured in a flash photolysis resonance fluorescence apparatus over the temperature range 240-440 K. The data at total pressures (using Ar diluent gas) between 25-50 torr for acetic acid ( k l ) , propionic acid ( k 2 ) , and i-butyric acid (k,) were used to derive the Arrhenius expressionsexp[-(120 ? 3 0 ) / T ] cm3 molecule^' s and k , = (2.6 2 0.2) x lo-'' exp[-(70 ? 25)/T] cm3 molecule-' s 'At 298 K, the measured rate constants (in units of 10 12 cm3 molecule-1 s-') were: k , = (0.74 ? 0.061, k , = (1.22 2 0.12), and k , = (2.00 ? 0.20). In addition a rate constant of (0.37 k 0.041, in the above units, was determined for the reaction of OH with formic acid. The error limits cited above are 2 a from the linear least squares analyses. These results are discussed in terms of the mechanisms for these reactions and are compared to literature data.

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