Gas hydrate based
methodology plays a pivotal role in separation/storage.
Some associated crucial issues are optimization of gas content and
operational pressure and temperature and developing means of controlled
gas liberation upon command and means of converting larger volumes
of hydrates rapidly in a lighter (cheaper) medium. Accordingly, we
carried out systematic studies, aiming to enhance the methane gas
storage capacity in methane hydrates. We used hollow silica to improve
the hydrate formation kinetics and efficiency. We observed over 90%
hydrate conversion in a silica–water–methane system
at moderately high pressure (5.0 MPa) and 278 K. Methane hydrate conversion
in such a system is extremely fast, and this material is apt for multiple
freezing–thawing cycles without noticeable reduction in the
storage capacity. The volume storage capacity increased from 128 to
206 v (STP)/v by decreasing the combined mass of water and silica
from 100 and 18 g in a fixed volume nonstirred reactor at pressures
higher than 5.0 MPa.
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