Interfacial Nanobubbles and the Memory Effect of Natural Gas Hydrates

Maeda, Nobuo

doi:10.1021/acs.jpcc.8b02416

Cited by 48 publications

(30 citation statements)

References 51 publications

(122 reference statements)

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“…This might the reason why the hydrophobic surface can promote the nucleation of hydrate during the nucleation process. The result was in agreement with the hypothesis proposed by Maeda and the molecular simulation result from He et al…”

Section: Resultssupporting

confidence: 93%

CH₄ Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

Guo

Xiao

et al. 2018

Langmuir

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The surface hydrophobicity of solid particles plays a critical role in the nucleation of gas hydrate formation, and it was found that the hydrophobic surface will promote this nucleation process, but the underlying mechanism is still unveiled. Herein, we proposed for the first time our new theory that the formation of methane nanoscale gas bubbles on the hydrophobic surface provides the nuclei sites for further formation of methane hydrate. First, we studied the effect of hydrophobicity of particles on the nucleation of hydrate. It was found that the hydrophobic graphite and silica particles would promote the nucleation of hydrate, but the hydrophilic silica particles did not promote the methane hydrate nucleation. Then, we designed the atomic force microscopy experiment to explain this mechanism from a nanometer scale. The results showed that the methane nanobubbles were formed on the hydrophobic highly ordered pyrolytic graphite surface, but they were hard to form on the hydrophilic mica surface. These results indicated that the methane nanobubbles on the hydrophobic surface could provide the gas hydrate nucleation sites and may induce a rapid nucleation of methane hydrate.

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Section: Resultssupporting

confidence: 93%

CH₄ Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

Guo

Xiao

et al. 2018

Langmuir

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“…These nanobubbles are generated due to the slow displacement reaction of water with Mg. Nanobubbles provide high-pressure points for heterogeneous nucleation on the oxide surface. The influence of bubbles on nucleation has been previously observed by our group, and bubble-promoted nucleation has been hypothesized in several other studies. ,− In particular, Li and Wang clearly concluded that the three-phase contact line helps in nucleation promotion of methane hydrates …”

Section: Resultssupporting

confidence: 69%

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Kar

Acharya

Bhati

et al. 2021

ACS Sustainable Chem. Eng.

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Gas hydrates offer solutions in areas like CO 2 sequestration and desalination. However, their formation is severely limited by long induction (wait) times for nucleation, which range from hours to days. Many existing nucleation promotion techniques involve chemical additives, which invite environmental and process-related concerns. Here, we report a simple, passive, and environmentally friendly technique to significantly promote the nucleation of CO 2 hydrates: magnesium (in pure and alloy forms) triggers nucleation almost instantaneously. We report induction times of less than 1 min, which is the fastest induction time reported for any gas hydrate under stagnant conditions. This translates to Mg-promoted nucleation rates being 3000 times higher than the baseline. Statistically meaningful measurements of nucleation kinetics (in milliliter and liter-scale reactors), direct visualization of nucleation, and X-ray photoelectron spectroscopy (XPS)/Fourier-transform infrared spectroscopy (FTIR) analysis uncover several chemistry-related insights associated with Mg-based promotion. Importantly, the three-phase line of magnesium−water−CO 2 gas is key to promotion. Porous oxide layers, generation of H 2 nanobubbles, and chemisorption of CO 2 on Mg surfaces are other factors responsible for accelerated nucleation. Interestingly, Mg alloys exhibit faster nucleation promotion than pure Mg, which is significant in salt water medium. Overall, our work opens up pathways for faster synthesis of hydrates, which is critical to realizing applications.

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“…This could be due to memory effect. It is possible that in the first cycle supersaturation is created because of gas bubbles, which persists for some time [50,51]. Despite the fact that weighed water and sand were thoroughly mixed in the cell before gas supply, another reason may be an increase in the water-gas contact surface due to the redistribution of water after the cycle of hydrate formation and decomposition.…”

Section: Influence Of Water Saturation Grain Size Of Quartz Sand Andmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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The development of technologies for the accelerated formation or decomposition of gas hydrates is an urgent topic. This will make it possible to utilize a gas, including associated petroleum one, into a hydrate state for its further use or to produce natural gas from hydrate-saturated sediments. In this work, the effect of water content in wide range (0.7–50 mass%) and the size of quartz sand particles (porous medium; <50 μm, 125–160 μm and unsifted sand) on the formation of methane and methane-propane hydrates at close conditions (subcooling value) has been studied. High-pressure differential scanning calorimetry and X-ray computed tomography techniques were employed to analyze the hydrate formation process and pore sizes, respectively. The exponential growth of water to hydrate conversion with a decrease in the water content due to the rise of water–gas surface available for hydrate formation was revealed. Sieving the quartz sand resulted in a significant increase in water to hydrate conversion (59% for original sand compared to more than 90% for sieved sand). It was supposed that water suction due to the capillary forces influences both methane and methane-propane hydrates formation as well with latent hydrate forming up to 60% either without a detectable heat flow or during the ice melting. This emphasizes the importance of being developed for water–gas (ice–gas) interface to effectively transform water into the hydrate state. In any case, the ice melting (presence of thawing water) may allow a higher conversion degree. Varying the water content and the sand grain size allows to control the degree of water to hydrate conversion and subcooling achieved before the hydrate formation. Taking into account experimental error, the equilibrium conditions of hydrates formation do not change in all studied cases. The data obtained can be useful in developing a method for obtaining hydrates under static conditions.

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Interfacial Nanobubbles and the Memory Effect of Natural Gas Hydrates

Cited by 48 publications

References 51 publications

CH₄ Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

CH₄ Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

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Interfacial Nanobubbles and the Memory Effect of Natural Gas Hydrates

Cited by 48 publications

References 51 publications

CH4 Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

CH4 Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

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CH₄ Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate

CH₄ Nanobubbles on the Hydrophobic Solid–Water Interface Serving as the Nucleation Sites of Methane Hydrate