期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 255, 期 -, 页码 220-225出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.07.047
关键词
Gas hydrates; Methane storage; Nanoconfinement; Activated carbon; Saline environment
类别
资金
- MINECO [NIAT2016-80285-P]
- CONCERT Project-NASEMS [PCIN-2013-057]
- Generalitat Valenciana [PROMETEOII/2014/004]
- Spanish synchrotron ALBA [2016021724]
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 degrees 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 sl crystal structure and a stoichiometry that mimics natural hydrates. These findings open the gate towards the application of activated carbons with a highly developed nanoporous network as host structure for offshore methane storage in marine reservoirs. (C) 2017 Elsevier Inc. All rights reserved.
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