期刊
JOURNAL OF MOLECULAR MODELING
卷 20, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/s00894-014-2311-8
关键词
Formation mechanism; Methane hydrate; Molecular dynamics simulation; Montmorillonite
类别
资金
- National Science Fund for Distinguished Young Scholars of China [51225603]
- National Natural Science Foundation of China [21106144, 51376184, 51306188]
- Science & Technology Program of Guangzhou [2012 J5100012]
- Chinese Academy of Sciences [KGZD-EW-301-2]
The formation and mechanism of CH4 hydrate intercalated in montmorillonite are investigated by molecular dynamics (MD) simulation. The formation process of CH4 hydrate in montmorillonite with 1 similar to 8 H2O layers is observed. In the montmorillonite, the surface H2O constructs the network by hydrogen bonds with the surface Si-O ring of clay, forming the surface cage. The interlayer H2O constructs the network by hydrogen bonds, forming the interlayer cage. CH4 molecules and their surrounding H2O molecules form clathrate hydrates. The cation of montmorillonite has a steric effect on constructing the network and destroying the balance of hydrogen bonds between the H2O molecules, distorting the cage of hydrate in clay. Therefore, the cages are irregular, which is unlike the ideal CH4 clathrate hydrates cage. The pore size of montmorillonite is another impact factor to the hydrate formation. It is quite easier to form CH4 hydrate nucleation in montmorillonite with large pore size than in montmorillonite with small pore. The MD work provides the constructive information to the investigation of the reservoir formation for natural gas hydrate (NGH) in sediments.
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