Abstract
The rate of adsorption of propane on platinum in 37 m/o at 30°C has been measured using single linear voltage sweep techniques as a complement to earlier studies at 90°C. The surface coverage by hydrocarbon species was measured as a function of adsorption time and potential. The rate of adsorption follows Langmuir kinetics with a third‐order dependence on free surface. The rate of reaction of the initial adsorbate at 90°C to form a highly electro‐active species (type I) was also measured, and found to be proportional to the surface coverage of the initial adsorbate (type II) and the square of the fraction free surface. The subsequent rate of electrochemical oxidation of type I was proportional to the surface coverage of type I and to free surface. Values for the kinetic parameters are reported, and the results are discussed in terms of a proposed mechanism for the over‐all oxidation process.
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