2. Methane hydrates
Methane hydrate is made up of methane molecules (CH 4 ), surrounded by a solid network of water molecules (H 2 O) arranged in a cage, hence the name clathrate (from the Greek klathron, closure), also given to hydrates. The strength of the van der Waals bonds uniting the water molecules around the "encapsulated" molecule only enables these crystalline structures to be maintained under certain conditions of pressure (high pressure) and temperature (low temperature).
Hydrates are generally classified into three families, depending on the geometry of the cages formed by the water molecules. Depending on the type of crystallization, the size of the "cavity" in which the "host" molecule is trapped varies from 0.4 to 0.9 nm.
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Methane hydrates
Methane hydrates in natural environments
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Bibliography
- (1) - World Energy Outlook - Agence Internationale de l'Énergie (2014) http://www.iea.org/bookshop/477-World_ Energy_Outlook_2014
- (2) - HUREAU (G.), VIALLY (R.) -...
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