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Kinetics of adsorption and diffusional characteristics of carbon molecular sieves

Lookup NU author(s): Dr Francis Ndaji, Emeritus Professor Mark ThomasORCiD


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Commercially available carbon molecular sieve (CMS) materials, from a variety of sources, and molecular sieving carbons produced from the carbonization of coal have been studied. These materials have been assessed in terms of their kinetics of adsorption of oxygen and nitrogen. The diffusion kinetics of gases into the carbons have been analysed using Fickian and phenomenological models. The Arrhenius activation energies and pre-exponential factors for gas adsorption in the two types of material have been compared. The adsorption kinetic results are discussed in relation to structural models for carbon molecular sieves where the kinetic selectivity for gases has been introduced by carbon deposition in the case of commercial CMS and by the variation of carbonization conditions in the case of the coal-based carbons produced in the laboratory.

Publication metadata

Author(s): Chagger HK, Ndaji FE, Sykes ML, Thomas KM

Publication type: Article

Publication status: Published

Journal: Carbon

Year: 1995

Volume: 33

Issue: 10

Pages: 1405-1411

Print publication date: 01/01/1995

ISSN (print): 0008-6223

ISSN (electronic): 1873-3891

Publisher: Pergamon


DOI: 10.1016/0008-6223(95)00087-T


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