Observation of interstitial molecular hydrogen in clathrate hydrates

R. Gary Grim, Brian C. Barnes, Patrick G. Lafond, Winfred A. Kockelmann, David A. Keen, Alan K. Soper, Masaki Hiratsuka, Kenji Yasuoka, Carolyn A. Koh, Amadeu K. Sum

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Abstract

The current knowledge and description of guest molecules within clathrate hydrates only accounts for occupancy within regular polyhedral water cages. Experimental measurements and simulations, examining the tert-butylamine+H2+H2O hydrate system, now suggest that H2 can also be incorporated within hydrate crystal structures by occupying interstitial sites, that is, locations other than the interior of regular polyhedral water cages. Specifically, H2 is found within the shared heptagonal faces of the large (43596273) cage and in cavities formed from the disruption of smaller (4454) water cages. The ability of H2 to occupy these interstitial sites and fluctuate position in the crystal lattice demonstrates the dynamic behavior of H2 in solids and reveals new insight into guest-guest and guest-host interactions in clathrate hydrates, with potential implications in increasing overall energy storage properties. Breaking the boundaries: In the presence of molecular hydrogen, interstitial occupancy is observed in the type VI clathrate hydrate (see picture; tBuNH2 in interstices (red) with H2 (green)). This observation revises the definition of clathrate hydrate guest occupancy that assumes all guests are contained within the interior of the host water lattice.

Original languageEnglish
Pages (from-to)10710-10713
Number of pages4
JournalAngewandte Chemie - International Edition
Volume53
Issue number40
DOIs
Publication statusPublished - 2014 Sep 26

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Keywords

  • density functional calculations
  • inclusion compounds
  • molecular dynamics
  • neutron diffraction
  • Raman spectroscopy

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Grim, R. G., Barnes, B. C., Lafond, P. G., Kockelmann, W. A., Keen, D. A., Soper, A. K., Hiratsuka, M., Yasuoka, K., Koh, C. A., & Sum, A. K. (2014). Observation of interstitial molecular hydrogen in clathrate hydrates. Angewandte Chemie - International Edition, 53(40), 10710-10713. https://doi.org/10.1002/anie.201406546