Molecular Cage Occupancy of Clathrate Hydrates at Infinite Dilution: Experimental Determination and Thermodynamic Significance
نویسندگان
چکیده
منابع مشابه
On the thermodynamic stability of clathrate hydrates IV: double occupancy of cages.
We have extended the van der Waals and Platteeuw theory to treat multiple occupancy of a single cage of clathrate hydrates, which has not been taken into account in the original theory but has been experimentally confirmed as a real entity. We propose a simple way to calculate the free energy of multiple cage occupancy and apply it to argon clathrate structure II in which a larger cage can be o...
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Gas mixtures of methane and ethane form structure II clathrate hydrates despite the fact that each of pure methane and pure ethane gases forms the structure I hydrate. Optimization of the interaction potential parameters for methane and ethane is attempted so as to reproduce the dissociation pressures of each simple hydrate containing either methane or ethane alone. An account for the structura...
متن کاملMultiple guest occupancy in clathrate hydrates and its significance in hydrogen storage.
We report a new concept of structural transformation combined with tuning phenomena which together result in a significant increase in the hydrogen storage capacity in an icy material. It is necessary to investigate the use of a fully water-soluble structure H (sH) former so as to observe how hydrogen molecules are stably loaded into hydrate cages.
متن کاملImpact of the confinement on the intra-cage dynamics of molecular hydrogen in clathrate hydrates
We have studied the diffusive mobility of hydrogen molecules confined in different size cages in clathrate hydrates. In clathrate hydrate H2 molecules are effectively stored by confinement in two different size cages of the nano-porous host structure with accessible volumes of about 0.50 and 0.67 nm diameters, respectively. For the processes of sorption and desorption of the stored hydrogen the...
متن کاملIntra-cage dynamics of molecular hydrogen confined in cages of two different dimensions of clathrate hydrates
In porous materials the molecular confinement is often realized by means of weak Van der Waals interactions between the molecule and the pore surface. The understanding of the mechanism of such interactions is important for a number of applications. In order to establish the role of the confinement size we have studied the microscopic dynamics of molecular hydrogen stored in the nanocages of cl...
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ژورنال
عنوان ژورنال: The Journal of Physical Chemistry B
سال: 2009
ISSN: 1520-6106,1520-5207
DOI: 10.1021/jp909982n