Effect of Molecular Nitrogen on Multiple Hydrogen Occupancy in Clathrate Hydrates

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• 作者：Seongmin Park ; Dong-Yeun Koh ; Hyery Kang ; Jae W. Lee ; Huen Lee
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：September 4, 2014
• 年：2014
• 卷：118
• 期：35
• 页码：20203-20208
• 全文大小：376K
• ISSN：1932-7455

文摘

Multiple H₂ occupancy in confined cages has been explored for the purpose of enhancing storage capacity. Furthermore, balancing the formation pressure with high storage capacity is one of the most significant factors. Here, we demonstrate the use of binary (LGM + N₂) hydrates to capture hydrogen clusters under relatively mild conditions, even observing double H₂ occupancy in small cages. The cage occupancy and structures of hydrates were identified by the Raman spectroscopic analysis and high-resolution powder diffraction. The reaction product of binary (LGM + N₂) hydrates with H₂ molecules suggests the possibility of multiple H₂ occupancy in both small (5¹²) and large (5¹²6⁴) cages at relatively low pressures. Also, the lattice parameter decreases with an increase in H₂ occupancy. The unique and abnormal role of N₂ as a preoccupied coguest significantly affects the H₂ population in a crystalline hydrate matrix and further lowers the pressure for structure stabilization.