| 학회 |
한국화학공학회 |
| 학술대회 |
2019년 봄 (04/24 ~ 04/26, 제주국제컨벤션센터) |
| 권호 |
25권 1호, p.608 |
| 발표분야 |
열역학(Thermodynamics) |
| 제목 |
Increasing Hydrogen Storage Capacity using the Metastability of Gas Hydrates |
| 초록 |
An intrinsic challenge for gas storage in the hydrates is to balance the paradox between the storage capacity and thermodynamic efficiency. Here, we provide the first experimental evidence for increasing gas (H2 or N2) storage capacity at relatively mild condition (at 1 MPa and 263.15 K). With intensification of the sintering of SF6 hydrate particles, we observed an abnormal but unique synchronous behavior in Raman intensities of two guest molecules (SF6 and N2/H2) in hydrates consistently and repeatedly; over time, the scattering intensity for the guests (i) increases, (ii) decreases, and (iii) finally reaches the stable level. Without a concentration change of SF6, this abnormal behavior must arise from the possible changes in the scattering cross section of the molecules, suggesting that N2/H2 strongly interacts with SF6 in the large cages, resulting in a possible co-occupation during the metastable transition. These observations on the metastability of gas hydrate attest the importance of the sintering effect as a barrier to prevent fast gas diffusion for reaching equilibrium, which could have significant implication in increasing overall gas storage in clathrate hydrates. |
| 저자 |
이보람1, Amadeu K. Sum2, 서용원3, 이건홍1
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| 소속 |
1POSTECH, 2Colorado School of Mines, 3UNIST |
| 키워드 |
열역학; 상평형
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| E-Mail |
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| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
