FIGURE 4. Formation/release kinetics of the H2 + THF double hydrate in the pores of silica beads.
From the following article:
Tuning clathrate hydrates for hydrogen storage
Huen Lee, Jong-won Lee, Do Youn Kim, Jeasung Park, Yu-Taek Seo, Huang Zeng, Igor L. Moudrakovski, Christopher I. Ratcliffe and John A. Ripmeester
Nature 434, 743-746(7 April 2005)
doi:10.1038/nature03457
At three THF concentrations (5.56, 0.7 and 0.2 mol%) the amount of H2 stored in the cages was measured using an isometric micro-syringe pump. Hydrates were maintained at 1 bar and 270 K for complete release of hydrogen after forming at 120 bar and 270 K. Hydrogen bubbles are observed during hydrate release (inset).