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

• Main Authors: Alexander Kurnosov, Leonid Dubrovinsky, Alexei Kuznetsov, Vladimir Dmitriev
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2006
• Subjects: Anvil; Methane hydrate
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1078.2241; http://www.znaturforsch.com/ab/v61b/s61b1573.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.