Kinetics measurements and in situ Raman spectroscopy of formation of hydrogen-tetrabutylammonium bromide semi-hydrates

Abstract

The kinetics of formation of H-2-TBAB semi-clathrate hydrates was studied in this work in order to elucidate their potential for H-2 storage. The influence of pressure (5-16 MPa), TBAB concentration (2.6 mol% and 3.7 mol%) and formation method (T-cycle method and T-constant method) on the hydrate nucleation, hydrate growth and H-2 storage capacity was determined. The results showed that kinetics is favored at higher pressures and solute concentrations. Additionally, the hydrate phase formation and dissociation was study for a solution of 2.6 mol% of TBAB in situ by using the Raman spectroscopy technique. The inclusion of H-2 in the semi-hydrate phase was confirmed. The results showed the importance of H-2 mass transfer on the storage capacity of the H-2-TBAB semi-hydrates.