Surprising diffusion behaviour in the restricted regions of silicalite

Yashonath, Subramanian ; Banyopadhyay, Sanjoy (1994) Surprising diffusion behaviour in the restricted regions of silicalite Chemical Physics Letters, 228 (1-3). pp. 284-288. ISSN 0009-2614

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0009-2614(94)00902-3

Abstract

One of the chief uses of porous materials such as zeolites is in the separation of mixtures of hydrocarbons. Molecular sieve properties of an adsorbate-zeolite system are known to depend on the shape and size of the adsorbate and the dimensions of the channels or cages. Molecular dynamics simulations of simple Lennard-Jones particles in silicalite as a function of the adsorbate diameter show unexpected behaviour; the diffusion coefficient exhibits a peak when the diameter of the adsorbate approaches the channel diameter. This interesting result implies a breakdown of the geometrical criterion and has far-reaching implications in diverse fields such as diffusion across bio-membranes in cells, separation of mixtures by zeolites and host-guest chemistry.

Item Type:Article
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ID Code:55830
Deposited On:19 Aug 2011 05:41
Last Modified:19 Aug 2011 05:41

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