| 초록 |
F-gases are man-made gases which are mainly utilized in semiconductor industries and refrigeration systems. Since F-gases have high potential of global warming effect, various methods to decrease F-gas concentration from the emission source have been studied. In that sense, gas hydrate formation was suggested as an efficient way to separate F-gases, such as CHF3, C2F6 and SF6. Among other F-gases, C3F8 was not expected to form gas hydrates since its molecular size (6.9Å) is too large to be enclathrated in gas hydrate cages. However, this study discovered that C3F8 molecules can also be enclathrated in the gas hydrate lattices, only in the presence of sII hydrate-forming F-gas molecules such as SF6 and C2F6. In this study, the three-phase (H-LW-V) equilibria of mixed C3F8 + SF6/C2F6 hydrates were measured, and the crystal structure and lattice parameters of those mixed hydrates were analyzed through PXRD. Also, in-situ Raman spectroscopy demonstrated the enclathration of C3F8 molecules in the hydrate phase with SF6 and C2F6. The overall results prove that we discovered a new gas hydrate-forming F-gas, and are expected to contribute to the expansion of gas hydrate research fields. |
