Formation and Dissociation Behavior Studies of Hydrogen Hydrate in the presence of Tetrahydrofuran by using High Pressure DSC

Abstract

Significant challenges still remain in the development of suitable materials for storing hydrogen for practical applications. Clathrate hydrates, as a special inclusion compounds, could be tailored by changing the storage pressure and temperature to adapt ambient conditions. In this work, the hydrates were adopted to encage hydrogen in tetrahydrofuran (THF) aqueous solution with concentration of 3.0 mol%. The formation and dissociation behaviors were investigated by a high pressure micro-differential scanning calorimeter at the operating pressure of 18 MPa, 25 MPa and 34 MPa. Experimental results show that the memory water only affects the hydrate formation behavior instead of the hydrate dissociation behavior. The dissociation temperature of the THF-H2 hydrate increases with the increase of the operating pressure, and its dissociation equilibrium data can be obtained. The dissociation temperatures of the THF-H2 hydrate are 9.26 ℃, 10.94 ℃ and 12.67 ℃ at the operating pressure of 18 MPa, 25 MPa and 34 MPa, respectively. It is fundamental for performing the kinetics and microscopic experiments.