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Sorbate-loading dependence of diffusion mechanism in a cubic symmetry zeolite of type ZK4: a molecular dynamics study

Demontis, Pierfranco and Suffritti, Giuseppe Baldovino (1997) Sorbate-loading dependence of diffusion mechanism in a cubic symmetry zeolite of type ZK4: a molecular dynamics study. The Journal of Physical Chemistry. B, Vol. 101 (30), p. 5789-5793. eISSN 1520-5207. Article.

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DOI: 10.1021/jp970358q

Abstract

In the present work we investigated how the sorbate loading controls the diffusion of spherically symmetric Lennard-Jones molecules in a cation-free zeolite of type LTA. This effect is studied by taking into account the mechanical flexibility of the framework, which allows for the energy relaxation of the sorbed molecules along with fluctuations of the window diameters. The number density of the adsorbed molecules was increased from 1 up to 15 methane molecules per cavity, which means from 8 up to 120 particles adsorbed in one unit cell. We have shown that the sorbate loading strongly alters the diffusion mechanism by inducing a transition at seven molecules per cavity from an increasing to a decreasing mobility regime.

Item Type:Article
ID Code:3754
Status:Published
Refereed:Yes
Uncontrolled Keywords:Zeolites, sorbate loading, microporous materials
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:American Chemical Society
eISSN:1520-5207
Deposited On:19 Apr 2010 15:41

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