Methane hydrates formation and dissociation in nano silica suspension

Methane gas hydrate (MH) formation/dissociation were investigated in nano silica and water system in a non-stirred reactor. The MH yield was significantly improved in the presence of nano silica. The overall methane hydrate conversion (≥80%) was achieved by optimizing the nano silica to water ratio. Two-stage dissociation was observed after a rapid de-pressurization. Methane gas intake of this system was steady for multiple freezing–thawing cycles signifying improved stability for methane gas storage.

► Higher methane hydrate conversions (>80%) in suspensions of nano silica. ► No need of rigorous mixing of silica and water. ► The system is stable for multiple freezing–thawing cycles. ► Higher volumetric hydrate conversion in water to silica optimized system. ► Gas release from hydrates (upon de-pressurization) occurs in two stages in 267–273 & 274–280 K.