Abstract
CONSIDER the case of a unimolecular gas reaction catalysed by a surface obeying the Langmuir adsorption isotherm, with true velocity constant k, adsorption coefficient b, heat of adsorption λ, surface coverage θ, pressure p. It is possible to derive a very simple relation between apparent activation energy Ea, true activation energy Et, and θ, which should prove of considerable utility. The rate r is: 
where 
hence 
substituting θ/1 – θ = bp 
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References
Hinshelwood, C. N., The Kinetics of Chemical Change, Chap. 8 (Oxford Univ. Press, 1940).
Sandler, Y. L., J. Chem. Phys., 21, 2243 (1953).
Eley, D. D., Trans. Farad. Soc., 44, 216 (1948).
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ELEY, D. Activation Energy and Fractional Order. Nature 194, 1076 (1962). https://doi.org/10.1038/1941076a0
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DOI: https://doi.org/10.1038/1941076a0
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