Methane hydrate formation in the confined nanospace of activated carbons in seawater environment
- Cuadrado-Collados, Carlos
- Fauth, François
- Such-Basañez, Ion
- Martinez-Escandell, Manuel
- Silvestre-Albero, Joaquín
DOIAbstract
Methane hydrate formation studies in saline environment show that activated carbons are excellent host structures able to promote the water-to-hydrate conversion. Under confinement conditions, methane hydrate formation takes place at mild temperatures (−10 °C), low pressures (<6 MPa), with extremely fast kinetics (within minutes) and with a large adsorption capacity (up to 66 wt% CH4 for seawater, i.e. a 128% improvement compared to the dry carbon). Similar studies using ultrapure water give rise to a total methane adsorption capacity of 93 wt%, i.e. entropic effects exerted by salt play a crucial role in the methane hydrate nucleation and growth. Synthesized methane hydrates exhibit a sI crystal structure and a stoichiometry that mimics na...
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