Diffusion of propane, propylene and isobutane in 13X zeolite by molecular dynamics

Miguel A. Granato, Miguel Jorge, Thijs J. H. Vlugt, Alirio E. Rodrigues

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31 Citations (Scopus)

Abstract

This paper presents single component diffusion data of propane, propylene and isobutane in zeolite 13X obtained by molecular dynamics (MD) simulations, especially its dependence on temperature and concentration. Our results are critically compared to experiments and previous simulation data, when available. One novelty of this work is that the diffusion coefficients are computed taking the framework cations of zeolite 13X into consideration. Furthermore, to our knowledge, we present the first simulation results for propylene diffusion in faujasite frameworks. From the mean squared displacements, self-diffusion coefficients of 7.5 x 10(-9), 9.1 x 10(-9), and 9.6 x 10(-10) m(2) s(-1) for 2 molecules/unit cell were calculated for propane, propylene, and isobutane at 373 K, respectively. The simulations show that the diffusivity decreases with increasing loadings for all adsorbates studied. Finally, transport diffusivities were estimated from the self-diffusion coefficient and the equilibrium adsorption isotherms by using the Darken equation. (C) 2010 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2656-2663
Number of pages8
JournalChemical Engineering Science
Volume65
Issue number9
DOIs
Publication statusPublished - 1 May 2010

Keywords

  • diffusion
  • propane
  • propylene
  • isobutane
  • 13X zeolite
  • molecular dynamics

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