Structural Transformation of Isopropylamine Semiclathrate Hydrates in the Presence of Methane as a Coguest

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• 作者：Seungmin Lee ; Youngjun Lee ; Sungwon Park ; Yongwon Seo
• 刊名：The Journal of Physical Chemistry B
• 出版年：2012
• 出版时间：November 15, 2012
• 年：2012
• 卷：116
• 期：45
• 页码：13476-13480
• 全文大小：236K
• 年卷期：v.116,no.45(November 15, 2012)
• ISSN：1520-5207

文摘

Guest-induced structural transformation in amine semiclathrate hydrates is a unique pattern caused by modifying the hydrophobic鈥揾ydrophilic balance, and thus, it can be applied to potential gas storage and transportation areas. The experimental results of the structural transformation of isopropylamine (IPA) semiclathrate hydrates in the presence of methane (CH₄) as a coguest are presented with a focus on the macroscopic phase behavior and microscopic analytical methods such as powder X-ray diffraction (PXRD) and NMR spectroscopy. The introduction of CH₄ molecules as coguests changed the structure of the IPA路8.0H₂O semiclathrate hydrates (hexagonal, P6₃/mmc) to sII gas hydrates (cubic, Fd3m). The microscopic analysis results indicate that the guest gas distribution and the clathrate hydrate composition can be altered with adjustment of the IPA concentration. The overall experimental results are valuable for increased understanding of the stability conditions, structural details, and guest鈥揾ost interactions in hydrophobic guest gas + IPA clathrate hydrates.