[en] We show that for adsorption on heterogeneous and microporous surfaces, the Freundlich isotherm power-law exponent a is directly related to the Levy tail index of the distribution of the Langmuir parameter b and to the expected value and the variance of the adsorption energy distribution. This allows us to view adsorption at low pressure in these systems as a rare event dominated phenomena. Based on this discussion, a generalized isotherm formulation is proposed and applied to the interpretation of recent data on activated carbons. (C) 2004 Elsevier B.V. All rights reserved.
Disciplines :
Materials science & engineering Chemical engineering Physics
Author, co-author :
Brouers, François ; Université de Liège - ULiège > Services généraux (Faculté des sciences appliquées) > Relations académiques et scientifiques (Sciences appliquées)
Sotolongo, O.
Marquez, F.
Pirard, Jean-Paul ; Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Chimie physique appliquée
Language :
English
Title :
Microporous and heterogeneous surface adsorption isotherms arising from Levy distributions
Publication date :
01 April 2005
Journal title :
Physica A. Statistical Mechanics and its Applications