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Thermodynamics and Modeling of Sorption Isotherms
Author(s) -
Adolphs Jürgen
Publication year - 2016
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201500137
Subject(s) - capillary condensation , disjoining pressure , sorption , kelvin equation , adsorption , thermodynamics , surface tension , desorption , evaporation , capillary action , condensation , work (physics) , chemistry , mesoporous material , materials science , wetting , physics , organic chemistry , catalysis
An extended version of the thermodynamic computation model for sorption isotherms and capillary condensation is introduced. With the combination of the excess surface work (ESW) and disjoining pressure approach sorption isotherms for various pore size distributions of cylindrical and slit‐like mesopores are successfully modeled. The main idea is that during adsorption on pore walls the approaching films will collapse and capillary condensation proceeds, while evaporation is described with a modified Kelvin equation. In both cases adsorption and desorption, the surface tension dependency on the pore size is considered.