Thermodynamics and statistical mechanics of multilayer adsorption

Manuel Monleón Pradas, Manuel Salmerón Sánchez, Gloria Gallego Ferrer, José Luis Gómez Ribelles

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

The multilayer adsorption models of Brunauer-Emmett-Teller and Guggenheim-Anderson-de Boer are reconsidered. The relationship between the fitting parameters and the physical parameters of the equation is discussed. The preexponential factors of the parameters are shown to be in general far different from unity, contrary to a widespread use. A thermodynamical derivation illuminates the hypothesis on which the multilayer sorption equation is dependent and frees it from too restrictive hypothesis usually taken as necessary for its validity. Equations are derived for the number fraction of sorption sites occupied by different numbers of molecules. The Guggenheim-Anderson-de Boer equation is shown to imply incomplete occupation (jamming) of the first sorption layer at saturation.

Original languageEnglish
Pages (from-to)8524-8531
Number of pages8
JournalJournal of Chemical Physics
Volume121
Issue number17
DOIs
Publication statusPublished - Nov 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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