In this study, we examine the swapping pattern occurring between two external guest molecules, N2 and CO2, and crystalline (sI and sII) CH4 hydrate. For sI methane hydrate, the spectroscopic result shows that N2 molecules mainly attack CH4 molecules occupying small cages while CO2 molecules play an active role in replacing most of CH4 molecules in large cages. In the other case for sII and sH m...

Abstract The induction period is defined as the time required to obtain a detectable quantity of hydrates during their natural or artificial production. This includes initial nucleation phase and part following massive growth phase. Several methods were thought measure its length: most adopted are visual observation process direct temperature increase. However, these techniques not always feasi...

In 1811 Sir Humphry Davy, who gained fame for both his research on the methane-laden atmospheres in British coal mines and his synthesis of various new elements and compounds, witnessed the first chlorine hydrate crystallizing. At that time he probably did not imagine that 185 years later methane hydrates would fuel heated debates under the gothic vaults of a former Dominican monastery in Gent....

Clathrate and semi-clathrate hydrates have recently been gaining major interest as hydrogen storage material. The benefits of hydrates, such reversible formation dissociation, their environmentally friendly nature, economical costs, lower fire risk, make them one the most promising materials. One challenges when storing in hydrate crystals is extreme pressure temperature conditions required for...

Abstract Clathrate hydrates—also known as gas hydrates—are ice-like compounds consisting of and water molecules. They occur wherever elevated pressures low temperatures prevail; where enough hydrate-forming molecules are available. Therefore, natural hydrates at all active passive continental margins, in permafrost regions, some deep lakes, under unfavorable circumstances, also, pipelines. This...

Based on driving force for crystallization of one-component gas hydrate, in this report an expression for the supersaturation for crystallization of multicomponent gas hydrate is derived. Expressions for the supersaturation are obtained in isothermal and isobaric regimes. The results obtained are applied to the crystallization of hydrates of mixtures of methane plus ethane and can apply to ...