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Probe molecule kinetic studies of adsorption on MCM-41

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

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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.