High-pressure / High-temperature Behavior of the Methane-Ammonia- Water System up to 3 GPa

• Published in: Zeitschrift für Naturforschung B
• Main Authors: Kurnosov, Alexander, Dubrovinsky, Leonid, Kuznetsov, Alexei, Dmitriev, Vladimir
• Format: Article in Journal/Newspaper
• Language: English
• Published: Walter de Gruyter GmbH 2006
• Subjects: General Chemistry; Anvil; Methane hydrate
• Online Access: http://dx.doi.org/10.1515/znb-2006-1215; https://www.degruyter.com/view/journals/znb/61/12/article-p1573.xml; https://www.degruyter.com/document/doi/10.1515/znb-2006-1215/xml; https://www.degruyter.com/document/doi/10.1515/znb-2006-1215/pdf

Melting phase relations in the methane-ammonia-water system up to 3 GPa have been obtained in a series of in situ experiments in externally heated diamond anvil cells. The melting temperature of methane clathrate hydrates increases rapidly above pressures of ~ 1.5 GPa, and does not appear to be significantly affected by the presence of ammonia. The reaction of the hydrate formation at pressures 2 - 3 GPa is kinetically impeded. Our data show that the high-pressure methane hydrate has the maximum melting temperature among the clathrate hydrates studied so far.