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Quantitative characterization of breathing upon adsorption for a series of amino-functionalized MIL-53

Pera-Titus, M., Lescouet, T., Aguado, S. and Farrusseng, D. 2012. Quantitative characterization of breathing upon adsorption for a series of amino-functionalized MIL-53. Journal of Physical Chemistry C 116 (17) , pp. 9507-9516. 10.1021/jp2117856

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Abstract

This work presents the synthesis of MIL-53(Al) metal–organic frameworks with different terephthalate/2-aminoterephthalate linker ratios incorporated into the framework during hydrothermal synthesis. In all cases, the materials show prominent S-shaped isotherms upon CO2 adsorption that can be attributed to sorbate-induced breathing phenomena involving two narrow-to-large-pore phase transitions. However, the breathing properties of the MIL-53(Al) materials (i.e., the relative stability of the np phase) are modified by adjusting the terephthalate/2-aminoterephthalate ratio. As a consequence, the pressure at which the second np → lp phase transition occurs, as well as Henry’s constant for CO2 adsorption, are directly associated with the number of amino-modified linkers. The different N2 and CO2 adsorption/desorption patterns have been successfully reproduced through the formulation of thermodynamic isotherms, providing direct information about energy heterogeneity of the solid/sorbate system and a direct characterization of the phase transition zone for breathing systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 1932-7447
Date of Acceptance: 11 April 2012
Last Modified: 11 Jan 2021 14:45
URI: http://orca.cardiff.ac.uk/id/eprint/137408

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