“Similar self-preservation” and decomposition kinetics of tetrahydrofuran-hydrogen hydrate particles

Abstract

Storage hydrogen using hydrates is a promising alternative to other hydrogen storage technologies. In this work, the effects of pressure and temperature on the decomposition kinetics of binary THF-H2 hydrates was investigated systematically in the pressure range of 0.1 MPa–7 MPa and temperature from 243 K to 273 K. The results showed that the dissociation of THF-H2 hydrates could be divided into three stages, rapid decomposition, slow decomposition, and stable state. The higher the pressure, the lower the dissociation rate of THF-H2 hydrates in the final stable stage. It was worth to note that the dissociation rate of THF-H2 hydrates does not show a simple linear relationship with temperature. The anomalous phenomenon of THF-H2 hydrates dissociation was observed in the temperature region of 253 K and 268 K under 5 MPa, especially at 268 K, and it was called “similar self-preservation” phenomenon. The dissociation ratio of THF-H2 hydrates in 80 h was not more than 50 mol% at 268 K and 5 MPa. This study provides practical way for developing clathrate hydrate-based storage hydrogen (transport and application) in the future.