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Kinetics of the branching step in the hydrogen-oxygen reaction

✍ Scribed by S.C. Kurzius; M. Boudart

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
660 KB
Volume
12
Category
Article
ISSN
0010-2180

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✦ Synopsis

Lower explosion limits in hydrogco-oxygco and deuterium-oxyge/* mixtures have been measured in the diffusion regime, From the data, rate constants are calculated for 1he reactions H + O~ ~ OH + O and D + O~ ~ OD + O between 800 ' ~ and ! 000~K. Activation energies are found to differ by the difference in zero-point energies of OH and OD. Temperature-ind.'pendent pre-exponential factors differ by a factor of two. Transition states of fixed geometry are not reconcilable with the obg:rved kinetics; nor is the classical collision theory. With a transition state of very loose structure, the ot'~erved rate constants can be explained and successfully extrapolated down to 300°K and up to 1650°K.

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