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Surface diffusion of multilayer adsorbed species
Author(s) -
Chen Y. D.,
Yang R. T.
Publication year - 1993
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690390408
Subject(s) - thermal diffusivity , adsorption , diffusion , monolayer , surface diffusion , thermodynamics , surface (topology) , homogeneous , chemistry , mass diffusivity , kinetic energy , materials science , analytical chemistry (journal) , chemical physics , chromatography , mathematics , physics , classical mechanics , geometry , biochemistry
A model based on kinetic theory is derived for surface diffusion of multilayer adsorbed species on a homogeneous surface. A simple solution is obtained for expressing the concentration dependence of surface diffusivity. For monolayer adsorbate, the solution is reduced to the classical HIO model. This solution, in principle, requires no fitting parameters and is capable of predicting the unique concentration dependent behavior exhibited by multilayer surface diffusion, where the diffusivity first increases with surface concentration to a maximum followed by a decrease. Seventeen sets of experimental data from the literature are used to test the model, with fair results. It is also shown that heats of adsorption can be calculated from multilayer surface diffusivity data by using this model.