New evidence of confinement effects in mesoporous materials and the definition of confined Pitzer acentric factors.
In the present work, the corresponding states principle is proposed as a new approach to clarify the comparison between adsorption-desorption isotherms obtained on porous solids. The applicability of this principle at the capillary critical point in adsorption-desorption isotherms is demonstrated. Deviations of the Clausius-Clapeyron curves in reduced coordinates are interpreted in terms of polarizability, and those are perfectly correlated using analogous Pitzer acentric factors in confined environments. New acentric factors are proposed to take confinement effects in mesoporous materials into account. Enthalpic excesses during capillary condensation could be predicted, and those are supported by calorimetric experiments.
Trens
Philippe
P
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618, CNRS/ENSCM/UM1, FR 1878 Institut Gerhardt, 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France. philippe.trens@enscm.fr
Tanchoux
Nathalie
N
Galarneau
Anne
A
Fajula
François
F