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Article

Phase Behaviour of Methane Hydrates in Confined Media

Department of Chemical Engineering, South Kensington Campus, Imperial College London, London SW7 2AZ, UK
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Author to whom correspondence should be addressed.
Academic Editor: Heike Lorenz
Crystals 2021, 11(2), 201; https://doi.org/10.3390/cryst11020201
Received: 28 January 2021 / Revised: 10 February 2021 / Accepted: 15 February 2021 / Published: 18 February 2021
(This article belongs to the Special Issue Membrane Technology for Solid Particles Production)
In a study designed to investigate the melting behaviour of natural gas hydrates which are usually formed in porous mineral sediments rather than in bulk, hydrate phase equilibria for binary methane and water mixtures were studied using high-pressure differential scanning calorimetry in mesoporous and macroporous silica particles having controlled pore sizes ranging from 8.5 nm to 195.7 nm. A dynamic oscillating temperature method was used to form methane hydrates reproducibly and then determine their decomposition behaviour—melting points and enthalpies of melting. Significant decreases in dissociation temperature were observed as the pore size decreased (over 6 K for 8.5 nm pores). This behaviour is consistent with the Gibbs–Thomson equation, which was used to determine hydrate–water interfacial energies. The melting data up to 50 MPa indicated a strong, essentially logarithmic, dependence on pressure, which here has been ascribed to the pressure dependence of the interfacial energy in the confined media. An empirical modification of the Gibbs–Thomson equation is proposed to include this effect. View Full-Text
Keywords: methane hydrates; confined media; controlled pore size; melting point; confinement effect; pressure effect methane hydrates; confined media; controlled pore size; melting point; confinement effect; pressure effect
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MDPI and ACS Style

Bian, H.; Ai, L.; Hellgardt, K.; Maitland, G.C.; Heng, J.Y.Y. Phase Behaviour of Methane Hydrates in Confined Media. Crystals 2021, 11, 201. https://doi.org/10.3390/cryst11020201

AMA Style

Bian H, Ai L, Hellgardt K, Maitland GC, Heng JYY. Phase Behaviour of Methane Hydrates in Confined Media. Crystals. 2021; 11(2):201. https://doi.org/10.3390/cryst11020201

Chicago/Turabian Style

Bian, Hao, Lu Ai, Klaus Hellgardt, Geoffrey C. Maitland, and Jerry Y. Y. Heng. 2021. "Phase Behaviour of Methane Hydrates in Confined Media" Crystals 11, no. 2: 201. https://doi.org/10.3390/cryst11020201

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