Probe molecule kinetic studies of adsorption on MCM-41

Tools

Berenguer-Murcia, A. and Fletcher, A.J. and Garcia-Martinez, J. and Cazorla-Amoros, D. and Linares-Solano, A. and Thomas, K.M. (2003) Probe molecule kinetic studies of adsorption on MCM-41. Journal of Physical Chemistry B, 107 (4). pp. 1012-1020. ISSN 1520-6106 (http://dx.doi.org/10.1021/jp026764d)

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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.

ORCID iDs

Berenguer-Murcia, A., Fletcher, A.J. ORCID logoORCID: https://orcid.org/0000-0003-3915-8887, Garcia-Martinez, J., Cazorla-Amoros, D., Linares-Solano, A. and Thomas, K.M.;
CORE (COnnecting REpositories)