New approximate model for nonlinear adsorption and concentration dependent surface diffusion in a single particle

Gerardine G. Botte, Ruyu Zhang, James A. Ritter

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A new approximate model for nonlinear adsorption (Langmuir model) and concentration dependent surface diffusion (HIO model) in a single particle was derived, based on a parabolic concentration profile assumption for the summation of the gas and adsorbed phases. The surface diffusivity was approximated with the adsorbed phase concentration evaluated at the surface of the particle, as the average of the adsorbed phase concentration, and as the average of the first two approximations. Overall, the approximate model based on the average of the first two approximations compared the best with the exact solution for a wide variety of systems and conditions.

Original languageEnglish
Pages (from-to)373-380
Number of pages8
JournalAdsorption
Volume5
Issue number4
DOIs
StatePublished - 1999

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