| 초록 |
In the field of clathrate hydrate research, incorporating a large guest molecule (LGM) as a secondary guest component has been widely studied for various purposes, including CH4/H2/natural gas storage and gas separation. In this study, the effects of several LGMs containing epoxy groups on the clathrate structures were investigated though synchrotron high-resolution powder diffraction, solid-state NMR, and Raman. This study covers six substances: 1,2-epoxycyclopentane (12ECP), 1,2-epoxycyclohexane (12ECH), 1,4-epoxycyclohexane (14ECH), 3,4-epoxytetrahydrofuran(34ETHF), 1,2-epoxyisobutane (12EIB), and propylene oxide (PO). Interestingly, 12ECP, 14ECH, and 12EIB were newly found to be capable of forming simple hydrates without CH4 gas. The equilibrium P-T conditions and methane storage capacities of the methane hydrates containing these six LGMs were also measured and compared. Although all LGMs were revealed to act as thermodynamic promoters for CH4 hydrates, that of 12ECP was particularly excellent compared to the others. |
