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Article

Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates

by 1,2 and 1,*
1
GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
2
Department for Earth and Environmental Sciences, University of Potsdam, 14476 Potsdam, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Nobuo Maeda, Zhiyuan Wang and Xiaodong Shen
Molecules 2021, 26(10), 3039; https://doi.org/10.3390/molecules26103039
Received: 26 April 2021 / Revised: 13 May 2021 / Accepted: 15 May 2021 / Published: 19 May 2021
(This article belongs to the Special Issue Gas Hydrates: Formation, Structures, and Properties)
Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed. View Full-Text
Keywords: mixed gas hydrates; hydrate formation process; coexisting phases; in situ Raman spectroscopy; gas supply conditions mixed gas hydrates; hydrate formation process; coexisting phases; in situ Raman spectroscopy; gas supply conditions
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MDPI and ACS Style

Pan, M.; Schicks, J.M. Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates. Molecules 2021, 26, 3039. https://doi.org/10.3390/molecules26103039

AMA Style

Pan M, Schicks JM. Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates. Molecules. 2021; 26(10):3039. https://doi.org/10.3390/molecules26103039

Chicago/Turabian Style

Pan, Mengdi, and Judith M. Schicks 2021. "Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates" Molecules 26, no. 10: 3039. https://doi.org/10.3390/molecules26103039

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