Published Online: 09 June 2014
Accepted: May 2014
J. Chem. Phys. 140, 224701 (2014); https://doi.org/10.1063/1.4880962
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  • 1Instituto de Química Física Rocasolano, CSIC, Serrano 119, E-28006 Madrid, Spain
  • 2Instituto de Estructura de la Materia, CSIC, Serrano 123, E-28006 Madrid, Spain
  • 3Centro de Química e Bioquímica da Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
  • a)Electronic mail:

    b)Present address: Chemical Engineering Department, Virginia Tech University, Blacksburg, Virginia 24061, USA.

In this paper we investigate the adsorption of various probe molecules in order to characterize the porous structure of a series of pillared interlayered clays (PILC). To that aim, volumetric and microcalorimetric adsorption experiments were performed on various Zr PILC samples using nitrogen, toluene, and mesitylene as probe molecules. For one of the samples, neutron scattering experiments were also performed using toluene as adsorbate. Various structural models are proposed and tested by means of a comprehensive computer simulation study, using both geometric and percolation analysis in combination with Grand Canonical Monte Carlo simulations in order to model the volumetric and microcalorimetric isotherms. On the basis of this analysis, we propose a series of structural models that aim at accounting for the adsorption experimental behavior, and make possible a microscopic interpretation of the role played by the different interactions and steric effects in the adsorption processes in these rather complex disordered microporous systems.
The authors acknowledge the support from the Dirección General de Investigación Científica y Técnica under Grant Nos. FIS2010-15502 and MAT2012-33633 and from the Dirección General de Universidades e Investigación de la Comunidad de Madrid under Grant No. S2009/ESP/1691 and Program MODELICO-CM. We are very grateful for the computer resources provided by IBERCIVIS project. The CSIC is also acknowledged for providing support in the form of Project No. PIE 201080E120. J.P. also acknowledges FCT for PEst-OE/QUI/UI0612/2014. A.G. acknowledges financial support from JAE-Predoc program. Very helpful assistance by Dr. Silvia Imberti from ISIS during the neutron experiments and posterior data reduction is acknowledged.
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