Fluorocarbon adsorption in hierarchical porous frameworks

Radha Kishan Motkuri (), Harsha V. R. Annapureddy, M. Vijaykumar, H. Todd Schaef, Paul F. Martin, B. Peter McGrail, Liem X. Dang, Rajamani Krishna and Praveen K. Thallapally ()
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Radha Kishan Motkuri: Energy and Environment Directorate, Pacific Northwest National Laboratory
Harsha V. R. Annapureddy: Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory
M. Vijaykumar: Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory
H. Todd Schaef: Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory
Paul F. Martin: Energy and Environment Directorate, Pacific Northwest National Laboratory
B. Peter McGrail: Energy and Environment Directorate, Pacific Northwest National Laboratory
Liem X. Dang: Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory
Rajamani Krishna: Van ‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904
Praveen K. Thallapally: Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Metal-organic frameworks comprise an important class of solid-state materials and have potential for many emerging applications such as energy storage, separation, catalysis and bio-medical. Here we report the adsorption behaviour of a series of fluorocarbon derivatives on a set of microporous and hierarchical mesoporous frameworks. The microporous frameworks show a saturation uptake capacity for dichlorodifluoromethane of >4 mmol g−1 at a very low relative saturation pressure (P/Po) of 0.02. In contrast, the mesoporous framework shows an exceptionally high uptake capacity reaching >14 mmol g−1 at P/Po of 0.4. Adsorption affinity in terms of mass loading and isosteric heats of adsorption is found to generally correlate with the polarizability and boiling point of the refrigerant, with dichlorodifluoromethane >chlorodifluoromethane >chlorotrifluoromethane >tetrafluoromethane >methane. These results suggest the possibility of exploiting these sorbents for separation of azeotropic mixtures of fluorocarbons and use in eco-friendly fluorocarbon-based adsorption cooling.

Date: 2014
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DOI: 10.1038/ncomms5368

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