Effect of material surface on the formation and dissociation of gas hydrate in restricted space between two parallel substrates

Rao, Shihang; Li, Zhenchao; Deng, Yajun; Huang, Xing; Lu, Hailong

doi:10.1016/j.cej.2022.138120

Cited by 8 publications

(13 citation statements)

References 49 publications

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“…The part of the restricted space was placed inside the pressure cell. Further details of the experimental setup can be found in our previous work …”

Section: Methodsmentioning

confidence: 99%

“…Further details of the experimental setup can be found in our previous work. 22 Experimental Procedure. The two substrates were positioned parallel to each other on the platform (Figure 1b).…”

Section: Materials and Pretreatmentmentioning

confidence: 99%

“…Understanding the formation characteristics of CO 2 hydrates in porous sediment will increase the practicability of hydrates and be helpful for the developments of CO 2 sequestration. In nature, the presence of solid surfaces (e.g., the surfaces of mineral crystals or unconsolidated clay) can play an important role in the formation of natural gas hydrate in microscopic pores and fractures. , Several experimental and simulating studies have confirmed the important effects of solid surfaces on gas hydrate formation. − However, until now, there has been little research concerning the effect of solid surface properties on CO 2 hydrate formation and the mechanism behind has been rarely studied. Among the limited literature, Bhattacharjee et al confirmed the effects of the surface property and particle size of solid materials on CO 2 hydrate formation kinetics by a fixed bed apparatus.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Solid Surface Properties on Spreading of a CO₂ Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Rao,

Deng,

et al. 2023

ACS Sustainable Chem. Eng.

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CO 2 hydrate formation in a restricted space is studied by conducting in situ visual observation when CO 2 gas reacts with a water droplet between two silicon wafers at 2.8−3.8 MPa and −6 to 6 °C. It is found that the hydrate film first appears around the gas−liquid interface and then spreads on the surface of silicon wafer by continuous formation at the advancing front. Experiments are also conducted with silicon wafers with different surface properties, prepared by the pretreatment methods of three types, to study the effect of solid surface on CO 2 hydrate formation. The results show that no hydrate spreading is observed on the hydrophobic surface pretreated by 1H,1H,2H,2H-perfluorodecyltriethoxysilane solution or crude oil; the hydrate film is observed, and it spreads on the hydrophilic surface pretreated by piranha solution. Quantitative analysis of the results obtained is employed to understand the intrinsic mechanism. It is found that considering the hydrate film spreading on solid surfaces under experimental conditions, the interfacial tension of hydrate and silicon wafer might play a more significant role in hydrate spreading rate and hydrate film thickness compared to pressure and temperature.

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“…The part of the restricted space was placed inside the pressure cell. Further details of the experimental setup can be found in our previous work …”

Section: Methodsmentioning

confidence: 99%

Section: Materials and Pretreatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Solid Surface Properties on Spreading of a CO₂ Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Rao,

Deng,

et al. 2023

ACS Sustainable Chem. Eng.

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“…Natural gas hydrates are formed in the pores of marine sediments, subject to the influence of the configuration and the mineral particles of pores. Efforts have been made to study the formation and distribution of hydrates in porous media. − Some experimental studies have revealed that the formation of gas hydrates can be promoted in the presence of solid particles, including silicon wafers, minerals, graphite particles, and hydrophobic glass. − , The distribution of hydrates in sediment pores varies in different conditions. Hydrates might directly cement the montmorillonite particles; on another side, hydrates are separated from quartz surfaces by water layers .…”

Section: Introductionmentioning

confidence: 99%

“…15−20 Some experimental studies have revealed that the formation of gas hydrates can be promoted in the presence of solid particles, including silicon wafers, minerals, graphite particles, and hydrophobic glass. [15][16][17]21 The distribution of hydrates in sediment pores varies in different conditions. Hydrates might directly cement the montmorillonite particles; on another side, hydrates are separated from quartz surfaces by water layers.…”

Section: ■ Introductionmentioning

confidence: 99%

Methane Gas Bubbles Affecting the Formation and Distribution of Hydrates in Kaolinite Slit Pores: A Molecular Dynamics Study

Deng

Rao

et al. 2023

Energy Fuels

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Molecular dynamics simulations are applied to study the formation and distribution of hydrates in kaolinite slit pores with methane gas bubbles adsorbed on one of the pore surfaces. The results show that hydrates nucleate in the bulk of solution in pores and then grow into hydrate shells around methane gas bubbles. These hydrate shells can hinder the diffusion of methane molecules. As the result, the formed hydrates cement and distribute near the kaolinite surfaces, on which methane gas bubbles have been adsorbed before hydrate formation. Because of the adsorption of dissolved methane molecules on siloxane surfaces, methane gas bubbles are highly dynamic, with more methane molecules exchanging between bubbles and solution. Therefore, the dissolution of methane molecules is promoted, which is beneficial for hydrate formation. However, in siloxane–siloxane pores, the strong adsorption effect of siloxane surface leads to the generation of layer-like bubbles, inhibiting hydrate formation by providing a relatively low methane concentration in solution. Methane gas bubbles can be directly adsorbed on siloxane surfaces, while water molecules exist between methane gas bubbles and gibbsite surfaces. Six-water rings can be induced by methane gas bubbles on gibbsite surfaces, which may promote hydrate formation by providing partial structures of hydrate cages. The formation behaviors and distribution characteristics of hydrates in kaolinite pores with methane gas bubbles are different from those in kaolinite pores with homogeneous methane solution. The results obtained can help to understand the different formation behaviors and distribution characteristics of hydrates in sediments.

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Microfluidic insights: Methane hydrate dynamics in distinct wettable confined space

Ouyang,

Pandey,

von Solms

2023

Chemical Engineering Journal

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Effect of material surface on the formation and dissociation of gas hydrate in restricted space between two parallel substrates

Cited by 8 publications

References 49 publications

Effect of Solid Surface Properties on Spreading of a CO₂ Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Effect of Solid Surface Properties on Spreading of a CO₂ Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Methane Gas Bubbles Affecting the Formation and Distribution of Hydrates in Kaolinite Slit Pores: A Molecular Dynamics Study

Microfluidic insights: Methane hydrate dynamics in distinct wettable confined space

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Effect of material surface on the formation and dissociation of gas hydrate in restricted space between two parallel substrates

Cited by 8 publications

References 49 publications

Effect of Solid Surface Properties on Spreading of a CO2 Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Effect of Solid Surface Properties on Spreading of a CO2 Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Methane Gas Bubbles Affecting the Formation and Distribution of Hydrates in Kaolinite Slit Pores: A Molecular Dynamics Study

Microfluidic insights: Methane hydrate dynamics in distinct wettable confined space

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Effect of Solid Surface Properties on Spreading of a CO₂ Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates

Effect of Solid Surface Properties on Spreading of a CO₂ Hydrate Film in a Restricted Space between Two Parallel Silicon Substrates