水合物
甲烷
笼状水合物
离解(化学)
化学
十二面体
拉曼光谱
无定形固体
分析化学(期刊)
化学物理
化学工程
结晶学
物理化学
有机化学
光学
物理
工程类
作者
Parisa Naeiji,Mengdi Pan,Manja Luzi-Helbing,Saman Alavi,Judith M. Schicks
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2023-02-23
卷期号:37 (6): 4484-4496
被引量:4
标识
DOI:10.1021/acs.energyfuels.2c03984
摘要
A study of methane hydrate dissociation under different temperature and pressure conditions combining in situ and ex situ Raman spectroscopic measurements, confocal microscopic characterizations, powder X-ray diffraction measurements, and molecular dynamics simulations was conducted. Both the experimental and the simulated data show that a distinction must be made between the dissociation behavior above and below the freezing point of water. During the dissociation process at temperatures near or below the freezing point of water, the simple CH4 hydrates showed well-known self-preservation behaviors. The formation of a quasi-liquid or amorphous phase due to the decompositions of the hydrate cavities at the outer layers of the hydrate crystal terminated the further decomposition of the hydrate phase. For a CH4 hydrate above the ice point, the dissociation appeared to be initiated at the surface of the hydrate phase. While significant amounts of the hydrate phase were present, the ratio of methane guests in the large and small cages remained constant. After large amounts of the hydrate phase decomposed, potential fragmentation of the remaining hydrate phase into collections of hydrate cages, which resulted in the preferred breakup of the tetrakaidecahedra (51262), was over the pentagonal dodecahedra (512).
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