Chemisorption induced-heterogeneity model

In the induced-heterogeneity model the chemisorption process is assumed to be an activated process and the clean surface is considered as homogeneous and characterized by chemisorption kinetics with activation energy Eq. 

Though both chemisorption and desorption kinetics can be explained by a model in which the surface is characterized by a fixed heterogeneity with a uniform energy distribution function, in chemisorption other explanations are possible, like induced heterogeneity or surface reconstruction. 

It is therefore not unreasonable to ascribe the wide observation of the Elovich behaviour in chemisorption to the occurrence of one or the other of the considered models (surface heterogeneity, induced heterogeneity, or surfaee reconstruction), and to ascribe the smaller set of systems following the Elovich behaviour in desorption to a unique model — fixed surface heterogeneity. 

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