An Interpretation of the Elovich Equation for the Rate of Chemisorption on the Basis of Surface Heterogeneity

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Abstract
For the heterogeneous surface where the distribution function was variable and/or desorption could not be neglected, the rate of adsorption was derived and the physical meaning of constant b in the Elovich equation was given. It was shown that in complicated case the Elovich equation is expected to apply only approximately in a limited range of coverage. The variation in constant b with pressure or temperature was qualitatively explained in terms of the concept that on changing pressure or temperature, different sets of sites are covered and/or the contribution of desorption in adsorption rate measurements, is altered. The chemisorption of hydrogen on zinc oxide and on chromic oxide gel was discussed on the basis of the present interpretation of the Elovich equation. Finally, it was shown that, on the basis of surface heterogeneity, the constant b obtained from the integrated form of the Elovich equation can not be given any physical meaning when the constant t0 of an appreciable magnitude is required.

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