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Modelling Sorption and Diffusion in Activated Carbon: a Novel Low Pressure Pulse-response Technique by M.J.G. Linders; L.J.P. van den Broeke; T.A. Nijhuis; F. Kapteijn; J.A. Moulijn is a Materials Science article available to read on EtoBox.

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A novel low pressure pulse-response technique, referred to as Multitrack, was applied for the simultaneous determination of the adsorption and diffusion parameters of gases in porous materials in a packed bed. Measurements were performed on two different carbons, Kureha and Sorbonorit B3, in the temperature range between 473 and 700 K. The modelling procedure of the pulse responses consisted of two parts. The transport parameters through the packed bed were determined from the pulse responses of non-adsorbing argon. Adsorption and diffusion parameters were determined for the adsorbing gases n-butane and hexafluoropropylene. As a general rule it is concluded that microporous materials must be described with a basic three-parameter model, while macroporous materials must be described with a simplified two-parameter model. The heats of adsorption, determined from the adsorption equilibrium constant, agree well with the values determined independently from uptake experiments. With Multitrack a single value for the diffusivity is obtained at a given temperature, valid for the low pressure limit, whereas with uptake a range of diffusivities is found, covering a wide concentration range.

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Author

M.J.G. Linders; L.J.P. van den Broeke; T.A. Nijhuis; F. Kapteijn; J.A. Moulijn

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6223)

Published

2001

Language

EN

Field

Materials Science (Physical Sciences)