Modeling on Hydrogen Absorption in Tetrahydrofuran Hydrate

概要

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The storage rate and amount of hydrogen in tetrahydrofuran hydrate were investigated by means of pressure–volume–temperature measurement under three temperature conditions. The absorption process of hydrogen in tetrahydrofuran hydrate was expressed as a dynamical model based on classical shrinking core model, which included two steps: hydrogen inclusion (containing adsorption, entrapment, and delocalization processes) at the surface of tetrahydrofuran hydrate and hydrogen diffusion through the formed layer of hydrogen+tetrahydrofuran mixed hydrate. The rate constant of surface reaction and/or diffusion coefficient of hydrogen depended on the porosity of small cages in tetrahydrofuran hydrate at equilibrium state. The storage amount of hydrogen at all temperatures would reach the maximum value of 2.0 mol (hydrogen)/mol (tetrahydrofuran) at a certain pressure. At the same pressure, the storage amount of hydrogen increases as the temperature decreases.
2012-07-01