Dissociation of methane into hydrocarbons at extreme (planetary) pressure and temperature.

Details Dissociation of methane into hydrocarbons at extreme (planetary) pressure and temperature. Dissociation of methane into hydrocarbons at extreme (planetary) pressure and temperature.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sci...275.1288a&link_type=abstract

Science, Vol. 275, No. 5304, p. 1288 - 1290

Physics

35

Planetary Atmospheres: Laboratory Simulations, Planetary Atmospheres: Methane, Planetary Atmospheres: Hydrocarbons

Scientific paper

Constant-pressure, first-principles molecular dynamic simulations were used to investigate the behavior of methane at high pressure and temperature. The simulations suggest that, below 100 GPa, methane dissociates into a mixture of hydrocarbons, and it separates into hydrogen and carbon only above 300 GPa. The simulation conditions (100 to 300 GPa; 4000 to 5000K) were chosen to follow the isentrope in the middle ice layers of Neptune and Uranus. Implications on the physics of these planets are discussed.

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