Evaluation of energy heterogeneity in metal−organic frameworks: absence of Henry’s region in MIL-53 and MIL-68 materials?

Pera-Titus, Marc, Savonnet, Marie and Farrusseng, David 2010. Evaluation of energy heterogeneity in metal−organic frameworks: absence of Henry’s region in MIL-53 and MIL-68 materials? Journal of Physical Chemistry C 114 (41) , pp. 17665-17674. 10.1021/jp104788p

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Abstract

We present in this study a detailed thermodynamic analysis of N2 adsorption at 77.4 K and low pressures in a series of metal−organic framework materials displaying different structures, pore textures, and framework flexibility. The energy heterogeneity of these materials has been quantified using a thermodynamic isotherm model developed in previous studies through two characteristic parameters. This formulation also allows the generation of an equation differing from the Dubinin−Astakhov isotherm that allows a proper description of gas adsorption at low pressures. Unlike zeolites or rigid coordination polymers, highly flexible MIL-53(Al) and MIL-68(In) materials are characterized by N2 adsorption isotherms lacking of a characteristic Henry’s region (linear trend) at low relative pressures. We argue about an unexpected promotion of energy heterogeneity on these materials due to sorbate-induced elastic deformation ascribed to compression tensions to explain this observation.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry Research Institutes & Centres > Cardiff Catalysis Institute (CCI)
Publisher:	American Chemical Society
ISSN:	1932-7447
Last Modified:	13 Oct 2020 14:16
URI:	https://orca.cardiff.ac.uk/id/eprint/135421

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