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Formation of clathrate cages of sI methane hydrate revealed by ab initio study

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  • Liu, Jinxiang
  • Hou, Jian
  • Xu, Jiafang
  • Liu, Haiying
  • Chen, Gang
  • Zhang, Jun

Abstract

We studied the formation micro-mechanism of the small and large cages in the nucleation pathway of sI methane hydrate using ab initio calculations. We found that the cage precursor is a pentagonal ring of water molecules plus one methane molecule, which is formed through the attraction of the pentagonal water ring to the methane molecule. Due to the difference of the hydrophobic-hydrophilic effects, the ring expansion mechanism and the layer-separated mechanism are observed for the growth of water faces in the small and large cages, respectively. Further, formation of the small cage is more structurally feasible and will locally prefer in the early stage of nucleation, but the large cages will dominate in the crystalline structure of methane hydrate, attributing to their high stabilization energy.

Suggested Citation

  • Liu, Jinxiang & Hou, Jian & Xu, Jiafang & Liu, Haiying & Chen, Gang & Zhang, Jun, 2017. "Formation of clathrate cages of sI methane hydrate revealed by ab initio study," Energy, Elsevier, vol. 120(C), pages 698-704.
    • Handle: RePEc:eee:energy:v:120:y:2017:i:c:p:698-704
    DOI: 10.1016/j.energy.2016.11.120
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    References listed on IDEAS

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    1. E. Dendy Sloan, 2003. "Fundamental principles and applications of natural gas hydrates," Nature, Nature, vol. 426(6964), pages 353-359, November.
    2. Chong, Zheng Rong & Yang, She Hern Bryan & Babu, Ponnivalavan & Linga, Praveen & Li, Xiao-Sen, 2016. "Review of natural gas hydrates as an energy resource: Prospects and challenges," Applied Energy, Elsevier, vol. 162(C), pages 1633-1652.
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    Cited by:

    1. Li, Zhi & Zhang, Yue & Shen, Yimao & Cheng, Liwei & Liu, Bei & Yan, Kele & Chen, Guangjin & Li, Tianduo, 2022. "Molecular dynamics simulation to explore the synergistic inhibition effect of kinetic and thermodynamic hydrate inhibitors," Energy, Elsevier, vol. 238(PB).
    2. Shi, Lingli & Li, Junhui & He, Yong & Lu, Jingsheng & Long, Zhen & Liang, Deqing, 2023. "Memory effect test and analysis in methane hydrates reformation process," Energy, Elsevier, vol. 272(C).

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