Effect of Nanobubble Evolution on Hydrate Process: A Review

Zhang, Yue; Zhao, Li; Deng, Shuai; Zhao, Ruikai; Nie, Xianhua; Liu, Yinan

doi:10.1007/s11630-019-1181-x

Cited by 44 publications

(22 citation statements)

References 62 publications

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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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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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“…It is suggested that hydrophobic surfaces can promote gas hydrate formations whereas hydrophilic ones act oppositely. The promoting effects of hydrophobic surfaces might arise from the tetrahedral ordering of water structure ,, and the increased gas density ,,,, at hydrophobic solid–water interfaces. The inhibiting effects of hydrophilic surfaces arise from the distorted water structure ,, and the decreased gas density ,,,, at hydrophilic solid–water interfaces.…”

Section: Solid Surfaces Affecting Gas Hydrate Formationmentioning

confidence: 99%

“…The promoting effects of hydrophobic surfaces might arise from the tetrahedral ordering of water structure 55,65,66 and the increased gas density 55,62,65,67,68 at hydrophobic solid−water interfaces. The inhibiting effects of hydrophilic surfaces arise from the distorted water structure 55,65,66 and the decreased gas density 55,62,65,67,68 at hydrophilic solid−water interfaces. We discuss these views in the following sections.…”

Section: Brief Descriptions Of Gas Hydrate Formationmentioning

confidence: 99%

Critical Review on Gas Hydrate Formation at Solid Surfaces and in Confined Spaces—Why and How Does Interfacial Regime Matter?

2020

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Gas hydrates are crystalline solids composed of water and gases. They occur abundantly in nature and are potentially significant to industry. Solid surfaces and confined spaces strongly affect the formation of gas hydrates. Research into this particular topic is active, particularly aiming to understand the effects of solid surfaces and confinements on gas hydrate formation and using functional solids for controlling the formation kinetics. Experimental observations appear to vary from one solid to another. The observations demand a knowledge of (1) why the effects vary among the solids and ( 2) what factors are determining. Here, we critically review experimental observations, discuss the underlying mechanisms, and generalize the literature findings for a better understanding of the mechanism. It is inferred that open hydrophobic solids can promote gas hydrate formation via a tetrahedral ordering of water and an increased density of gases at the solid−water interfaces. Open hydrophilic solids hinder gas hydrate formation via a distorted water structure and a depleted density of gases at the solid−water interfaces. Confining solids have rather complex effects due to the complexity of wetting in confined spaces. Therefore, confined media with moderate wettability and partial water saturation might provide optimum conditions for gas hydrate formation.

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“…The existence of these cages is thought to promote rapid crystallization of new hydrate once the thermodynamics (especially cooling; Uchida et al, 2000) is again favorable for hydrate formation. Substantial research has now also been conducted to investigate whether gas hydrate dissociation leaves behind not structured water cages, but gas nanobubbles (Bagherzadeh et al, 2015; Maeda, 2018; Uchida et al, 2016; Zhang et al, 2019). A subsequent episode of hydrate formation would then be initiated by rapid nucleation of a hydrate film at the nanobubble's liquid‐vapor interface.…”

Section: Definitionsmentioning

confidence: 99%

“…Journal of Geophysical Research: Solid Earth RUPPEL AND WAITE et al, 2016;Zhang et al, 2019). A subsequent episode of hydrate formation would then be initiated by rapid nucleation of a hydrate film at the nanobubble's liquid-vapor interface.…”

Section: 1029/2018jb016459mentioning

confidence: 99%

Timescales and Processes of Methane Hydrate Formation and Breakdown, With Application to Geologic Systems

Ruppel

Waite

2020

JGR Solid Earth

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Gas hydrate is an ice‐like form of water and low molecular weight gas stable at temperatures of roughly −10°C to 25°C and pressures of ~3 to 30 MPa in geologic systems. Natural gas hydrates sequester an estimated one sixth of Earth's methane and are found primarily in deepwater marine sediments on continental margins, but also in permafrost areas and under continental ice sheets. When gas hydrate is removed from its stability field, its breakdown has implications for the global carbon cycle, ocean chemistry, marine geohazards, and interactions between the geosphere and the ocean‐atmosphere system. Gas hydrate breakdown can also be artificially driven as a component of studies assessing the resource potential of these deposits. Furthermore, geologic processes and perturbations to the ocean‐atmosphere system (e.g., warming temperatures) can cause not only dissociation, but also more widespread dissolution of hydrate or even formation of new hydrate in reservoirs. Linkages between gas hydrate and disparate aspects of Earth's near‐surface physical, chemical, and biological systems render an assessment of the rates and processes affecting the persistence of gas hydrate an appropriate Centennial Grand Challenge. This paper reviews the thermodynamic controls on methane hydrate stability and then describes the relative importance of kinetic, mass transfer, and heat transfer processes in the formation and breakdown (dissociation and dissolution) of gas hydrate. Results from numerical modeling, laboratory, and some field studies are used to summarize the rates of hydrate formation and breakdown, followed by an extensive treatment of hydrate dynamics in marine and cryospheric gas hydrate systems.

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Effect of Nanobubble Evolution on Hydrate Process: A Review

Cited by 44 publications

References 62 publications

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Critical Review on Gas Hydrate Formation at Solid Surfaces and in Confined Spaces—Why and How Does Interfacial Regime Matter?

Timescales and Processes of Methane Hydrate Formation and Breakdown, With Application to Geologic Systems

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