Abstract
PALLADIUM significantly increases the reaction rate of graphite with oxygen in the 600°–700° C temperature range1. The activation energy for the catalysed reaction in this range is 124.5 kcalories/mole, however, compared with 48.8 kcalories/mole for the uncatalysed reaction, so the pre-exponential term A in the Arrhenius equation k = Ae−E/RT is correspondingly large. (In the equation k is the rate of reaction, E the activation energy and R and T have their usual identity.) This implies that the catalysed reaction takes place on surface sites which differ in both quantity and nature from those of the uncatalysed reaction.
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References
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Hennig, G. R., Appl. Phys. Lett., 4, 52 (1964).
Hennig, G. R., J. Inorg. Nucl. Chem., 24, 1129 (1962).
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FRYER, J. Oxidation of Graphite catalysed by Palladium. Nature 220, 1121–1122 (1968). https://doi.org/10.1038/2201121b0
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DOI: https://doi.org/10.1038/2201121b0
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