Kinetic Monte Carlo simulations of the loading dependence of diffusion in Zeolites

Krishna, R. ; van Baten, J. M. (2005) Kinetic Monte Carlo simulations of the loading dependence of diffusion in Zeolites Chemical Engineering & Technology, 28 (2). pp. 160-167. ISSN 0930-7516

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/ceat.20...

Related URL: http://dx.doi.org/10.1002/ceat.200407094

Abstract

Kinetic Monte Carlo (KMC) simulations are used to model diffusion of molecules in zeolites. A variety of loading dependences of the Maxwell-Stefan diffusivity, Ði, can be realized by allowing the jump frequencies, ν, of molecules to be influenced by the presence of neighboring molecules. Neighboring molecules are assumed to reduce or increase the activation energy for diffusion by δE and the jump frequencies ν are altered by a factor f = exp(δE/RT) for each neighboring molecule. By appropriate choice of ν and f the loading dependence of Ði can be made to match those obtained from either Molecular Dynamics (MD) simulations or experiment. The major advantage of the KMC simulation strategy is that considerably less computer power is required than for the corresponding MD simulations. Furthermore, KMC simulations allow mixture diffusion to be probed without additional parameter tuning. The KMC simulations also validate the applicability of the quasi-chemical theory of Reed and Ehrlich (Surf. Sci.1981, 105, 603–628) for describing the loading dependence of Ði.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Diffusion; Kinetics; Simulation; Zeolites
ID Code:94038
Deposited On:25 Jul 2012 07:14
Last Modified:25 Jul 2012 07:18

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