Hydrogen in Porous Tetrahydrofuran Clathrate Hydrate

摘要: The lack of practical methods for hydrogen storage is still a major bottleneck in the realization an energy economy based on as carrier.1 Storage within solid-state clathrate hydrates,2-4 and hydrate tetrahydrofuran (THF), has been recently reported.5, 6 In latter case, stabilization by THF claimed to reduce operation pressure several orders magnitude close room temperature. Here, we apply situ neutron diffraction show that-in contrast previous reports([5, 6])-hydrogen (deuterium) occupies small cages only 30 % (at 274 K 90.5 bar). Such D(2) load equivalent 0.27 wt. stored H(2). addition, that surplus D(2)O results formation additional ice Ih instead production sub-stoichiometric stabilized loaded (as was reported ref. 6). Structure-refinement studies [D(8)]THF dynamically disordered, while it fills each large [D(8)]THF17D(2)O stoichiometrically. Our takes up rapidly at pressures between 60 90 bar about 270 K). At temperatures above approximately 220 K, H-storage characteristics have similarities with those surface-adsorption materials, such nanoporous zeolites metal-organic frameworks,7, 8 but lower temperatures, adsorption rates slow down because reduced diffusion cages.