ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Absolute rate constants were determined for the gas phase reactions of OH radicals with a series of aliphatic alcohols using the flash photolysis resonance fluorescence technique. Experiments were performed over the temperature range 240-440 K at total pressures (using Ar diluent gas) between 25-50 Torr. The kinetic data for methanol (k1), ethanol (k2), and 2-propanol (k3) were used to derive the Arrhenius expressions \documentclass{article}\pagestyle{empty}\begin{document}$$ k_1 = (4.8 \pm 1.2) \times 10^{ - 12} \exp [- (480 \pm 70)/T]\,{\rm cm}^3\, {\rm molecule}^{ - 1} {\rm s}^{ - 1} $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ k_2 = (7.4 \pm 3.2) \times 10^{ - 12} \exp [- (240 \pm 110)/T]{\rm cm}^3 {\rm molecule}^{ - 1} {\rm s}^{ - 1} $$\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$$ k_3 = (5.8 \pm 1.9) \times 10^{ - 12} \exp [- (30 \pm 90)/T]\,{\rm cm}^3\, {\rm molecule}^{ - 1} {\rm s}^{ - 1} $$\end{document} At 296 K, the measured rate constants (in units of 10-13 cm3 molecule-1 s-1) were: k1 = (8.61 ± 0.47), k2 = (33.3 ± 2.3), and k3 = (58.1 ± 3.4). Room temperature rate constants for the OH reactions with several other aliphatic alcohols were also measured. These were (in the above units): 1-propanol, (53.4 ± 2.9); 1-butanol, (83.1 ± 6.3) and 1-pentanol, (108 ± 11). The results are discussed in terms of the mechanisms for these reactions and are compared to previous literature data.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550191106
