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Title: Adsorption of n-Pentane on Mesoporous Silica and Adsorbent Deformation
Authors: Gor, G.Y.
Paris, O.
Prass, J.
Russo, P.A.
Ribeiro Carrott, M.M.L.
Neimark, A.V.
Editors: Whitten, David G.
Winnik, Françoise M.
Whitten, Jo Wright
Sholl, David
Keywords: Adsorption-induced deformation
Mesoporous silica
Nonporous silica
n-Pentane adsorption
Strain isotherm
Issue Date: 12-Jun-2013
Publisher: ACS Publications
Citation: G. Y. Gor, O. Paris, J. Prass, P. A. Russo, M. M. L. Ribeiro Carrott, A. V. Neimark, Adsorption of n-Pentane on Mesoporous Silica and Adsorbent Deformation, Langmuir 2013, 29 (27), 8601–8608.
Abstract: Development of quantitative theory of adsorption-induced deformation is important, e.g., for enhanced coalbed methane recovery by CO2 injection. It is also promising for the interpretation of experimental measurements of elastic properties of porous solids. We study deformation of mesoporous silica by n-pentane adsorption. The shape of experimental strain isotherms for this system differs from the shape predicted by thermodynamic theory of adsorption-induced deformation. We show that this difference can be attributed to the difference of disjoining pressure isotherm, responsible for the solid−fluid interactions. We suggest the disjoining pressure isotherm suitable for n-pentane adsorption on silica and derive the parameters for this isotherm from experimental data of n-pentane adsorption on nonporous silica. We use this isotherm in the formalism of macroscopic theory of adsorption-induced deformation of mesoporous materials, thus extending this theory for the case of weak solid−fluid interactions. We employ the extended theory to calculate solvation pressure and strain isotherms for SBA-15 and MCM-41 silica and compare it with experimental data obtained from small-angle X-ray scattering. Theoretical predictions for MCM-41 are in good agreement with the experiment, but for SBA-15 they are only qualitative. This deviation suggests that the elastic modulus of SBA-15 may change during pore filling.
Type: article
Appears in Collections:QUI - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CQE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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