Enclathration of hydrogen by organic-compound clathrate hydrates

• Published in: Chemical engineering science Vol. 66; no. 11; pp. 2417 - 2420
• Main Authors: Kawamura, Taro, Takeya, Satoshi, Ohtake, Michika, Yamamoto, Yoshitaka
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.06.2011; Elsevier
• Subjects: acetone; Applied sciences; Cage; Chemical analysis; Chemical engineering; Clathrate hydrate; Clathrate hydrates; cyclic ethers; Diffraction; Energy; Exact sciences and technology; Fuel; Gases; Hydrates; Hydrogen; Lattice parameters; Occupation; Organic compounds; spectroscopy; X-ray diffraction; X-rays; Gases; Chemical analysis; Clathrate hydrate; Energy; Hydrogen; Fuel; Trend analysis; Clathrate; X ray diffraction; Powder
• ISSN: 0009-2509; 1873-4405
• DOI: 10.1016/j.ces.2011.03.002

The properties of hydrogen enclathration by cyclic ethers and acetone clathrate hydrates were investigated by powder X-ray diffraction, Raman spectroscopic analysis and volumetric analysis. Powder X-ray diffraction profiles indicate that the hydrates are structure-II hydrates. The variation in lattice constant by hydrogen occupation was investigated. This result indicates that inclusion of H 2 atom within empty small cage changes size of host cages depending on type of guest molecule. Raman results show that the samples formed binary clathrate hydrate of hydrogen and each organic compound. The amount of encaged H 2 was found to be comparable to that of H 2–THF binary hydrate. The trend of the changes for lattice constants is not related to the amount of encaged H 2. These results suggest that the organic compounds investigated in this study can be used as alternatives to THF for H 2 enclathration.