Structural Studies of Lake Baikal Natural Gas Hydrates
| Autor: | Satoshi Yamashita, A.V. Khabuev, G. V. Kalmychkov, A. G. Ogienko, Kh. Minami, Akihiro Hachikubo, A. V. Ildyakov, A. Yu. Manakov, T. V. Rodionova, O. Khlystov |
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| Rok vydání: | 2019 |
| Předmět: |
Chemistry
business.industry Clathrate hydrate Mineralogy 010402 general chemistry 010403 inorganic & nuclear chemistry 01 natural sciences Methane 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Natural gas Materials Chemistry Physical and Theoretical Chemistry Hydrate business Powder diffraction |
| Zdroj: | Journal of Structural Chemistry. 60:1437-1455 |
| ISSN: | 1573-8779 0022-4766 |
| Popis: | The structure of near-bottom gas hydrate samples obtained in Lake Baikal during the expeditions in 2005–2018 are reported. The hydrates contain mainly methane and ethane. More than 85% of the samples contain hydrate of cubic structure I (sI) with up to 4.2 mol.% ethane. The concentration of ethane in the samples containing hydrate of cubic structure II (sII) is 12–14 mol.%. Refined unit cell parameters of natural hydrates are in good agreement with the data obtained in the studies of artificially synthesized hydrates. Possible mechanisms for the formation of sII hydrates are discussed. Some arguments are provided in favor of a probable presence of dispersed gas hydrates in the near-bottom layers of Baikal sediments and the possibility of small variations in the composition of hydrate gas in different hydrate fragments taken from the same hydrate layer. |
| Databáze: | OpenAIRE |
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