Abstract
Phase equilibrium curves of H_2 + tetrahydrofuran and H_2 + tetra-n-butyl ammonium bromide mixed gas hydrates were measured. The equilibrium curve of H_2 + tetra-n-butyl ammonium bromide mixed hydrate shifts to the high-temperature side from that of H_2 + tetrahydrofuran mixed gas hydrate. It is directly confirmed by use of Raman spectroscopy that H_2 is enclathrated in the hydrate cages by adding a small amount of tetrahy drofuran or tetra-n-butyl ammonium bromide. In both mixed hydrates, H_2 is enclathrated in only the small cage while tetrahydrofuran or tetra-n-butyl ammonium bromide occupies the large cages of each mixed hydrate.
