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Charting the Complete Thermodynamic Landscape of Gas Adsorption for a Responsive Metal-Organic Framework

preprint
submitted on 15.01.2021, 10:27 and posted on 18.01.2021, 09:05 by Ruben Goeminne, Simon Krause, Stefan Kaskel, Toon Verstraelen, Jack D. Evans
New nanoporous materials are able to revolutionize adsorption and separation processes. In particular, materials with adaptive cavities have high selectivity and may display previously undiscovered phenomena, such as negative gas adsorption (NGA), in which gas is released from the framework upon an increase in pressure. Although the thermodynamic driving force behind this and many other counterintuitive adsorption phenomena have been thoroughly investigated in recent years, several experimental observations remain difficult to explain. This necessitates a comprehensive analysis of gas adsorption akin to the conformational free energy landscapes used to understand the function of proteins. For the first time, we constructed the complete thermodynamic landscape of methane adsorption on DUT-49, a system that demonstrates NGA. Traversing this complex landscape correctly reproduces the experimentally observed structural transitions, the temperature dependence of the NGA phenomenon and the observed hysteresis between adsorption and desorption. The complete thermodynamic description presented here provides unparalleled insight into the process of adsorption and provides a framework to understand other adsorbents that challenge our preconceptions.

Funding

Alexander von Humboldt foundation

Center for Information Services and High Performance Computing (ZIH)

Computational resources (Stevin Supercomputer Infrastructure) and services provided by the VSC (Flemish Supercomputer Center), funded by Ghent University, FWO and the Flemish Government – department EWI.

Research Board of Ghent University

History

Email Address of Submitting Author

jack.evans@tu-dresden.de

Institution

TU Dresden

Country

Germany

ORCID For Submitting Author

0000-0001-9521-2601

Declaration of Conflict of Interest

no conflict of interest

Licence

Exports