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Evaluation of confinement effects in zeolites under Henry's adsorption regime

Pera Titus, Marc and Llorens, Joan 2010. Evaluation of confinement effects in zeolites under Henry's adsorption regime. Applied Surface Science 256 (17) , pp. 5305-5310. 10.1016/j.apsusc.2009.12.067

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Abstract

This paper provides a detailed thermodynamic analysis of gas/vapour adsorption in zeolites at low pressures. At these conditions, we show first that Henry's isotherm can be conveniently rewritten using the thermodynamic isotherm model developed in a previous study [J. Llorens, M. Pera-Titus, Description of gas adsorption on microporous materials: evaluation of energy heterogeneity, J. Colloid Interface Sci. 331, 2009, 302–311], linking the integral free energy of adsorption relative to saturation, Ψ/RT, expressed as a Kiselev integral, with the variable Z = 1/−ln(Π), being Π the relative pressure. Relevant information about sorbate confinement effects in zeolites can be inferred using strong sorbates under Henry's adsorption regime using the thermodynamic formulation provided here. The confining level of zeolites can be characterized by a parameter (m1), whose value depends on the zeolite framework, but remains essentially unchanged with the sorbate probe molecule and temperature. We illustrate the application of these concepts using a collection of MFI and MTW-type zeolites as model systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0169-4332
Last Modified: 13 Oct 2020 14:00
URI: http://orca.cardiff.ac.uk/id/eprint/135419

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