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Probe molecule kinetic studies of adsorption on MCM-41

Lookup NU author(s): Dr Ashleigh Fletcher, Emeritus Professor Mark Thomas

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Abstract

Gases and vapors of varying dimensions were used as probes to investigate the adsorption processes on MCM-41 and precipitated silica, prepared by the same method as for MCM-41, but without the template. The adsorption kinetics of nitrogen, carbon dioxide, n-nonane, and α-pinene were studied for different amounts of preadsorbed gas/vapor as a function of relative pressure. The adsorption kinetics follow a linear driving force model for changes in surface coverage up to the adsorption isotherm plateaus. The variation of rate constant with relative pressure for MCM-41 and precipitated silica showed marked differences associated with adsorption in mesoporous structure, which are attributed to alignment of molecules in the mesopores leading to a pore blocking effect. The results are discussed in terms of differences in the adsorption mechanisms of gas/vapor diffusion in porous materials.


Publication metadata

Author(s): Berenguer-Murcia A, Fletcher AJ, Garcia-Martinez J, Cazorla-Amoros D, Linares-Solano A, Thomas KM

Publication type: Article

Publication status: Published

Journal: Journal of Physical Chemistry B

Year: 2003

Volume: 107

Issue: 4

Pages: 1012-1020

ISSN (print): 1089-5647

ISSN (electronic): 1520-5207

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/jp026764d

DOI: 10.1021/jp026764d


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