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Fluorocarbon adsorption in hierarchical porous frameworks

Author

Listed:
  • 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)

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.

Suggested Citation

  • Radha Kishan Motkuri & Harsha V. R. Annapureddy & M. Vijaykumar & H. Todd Schaef & Paul F. Martin & B. Peter McGrail & Liem X. Dang & Rajamani Krishna & Praveen K. Thallapally, 2014. "Fluorocarbon adsorption in hierarchical porous frameworks," Nature Communications, Nature, vol. 5(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5368
    DOI: 10.1038/ncomms5368
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