Stable Low-Pressure Hydrogen Clusters Stored in a Binary Clathrate Hydrate

doi:10.1126/science.1102076

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Science 15 October 2004:
Vol. 306. no. 5695, pp. 469 - 471
DOI: 10.1126/science.1102076

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Stable Low-Pressure Hydrogen Clusters Stored in a Binary Clathrate Hydrate

Louw J. Florusse,¹ Cor J. Peters,¹ Joop Schoonman,² Keith C. Hester,³ Carolyn A. Koh,³ Steven F. Dec,³ Kenneth N. Marsh,⁴ E. Dendy Sloan³^*

Thermodynamic, x-ray diffraction, and Raman and nuclear magneticresonance spectroscopy measurements show that clusters of H₂can be stabilized and stored at low pressures in a sII binaryclathrate hydrate. Clusters of H₂ molecules occupy small watercages, whereas large water cages are singly occupied by tetrahydrofuran.The presence of this second guest component stabilizes the clathrateat pressures of 5 megapascals at 279.6 kelvin, versus 300 megapascalsat 280 kelvin for pure H₂ hydrate.

¹ Faculty of Applied Sciences, Department of Chemical Technology, Physical Chemistry and Molecular Thermodynamics;
² Laboratory for Inorganic Chemistry, Delft Institute for Sustainable Energy; Delft University of Technology, Julianalaan 136, 2628 BL Delft, Netherlands.
³ Center for Hydrate Research, Department of Chemical Engineering, Colorado School of Mines, Golden, CO 80401, USA.
⁴ Department of Chemical and Process Engineering, University of Canterbury, Christchurch, Private Bag 4800, New Zealand.

^* To whom correspondence should be addressed. E-mail: esloan{at}mines.edu

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