Gas hydrates in confined space of nanoporous materials: new frontier in gas storage technology

Both, Avinash Kumar; Gao, Yurui; Zeng, Xiao Cheng; Cheung, Chin Li

doi:10.1039/d1nr00751c

Cited by 42 publications

(26 citation statements)

References 257 publications

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“…In this way, clathrate structures encapsulate guest molecules up to mole fractions of an order of 0.1, although most guest species are hydrophobic and nearly insoluble in liquid water . In nature, the largest part of methane on Earth is encapsulated in natural clathrates under subsea and permafrost sediments. , Natural clathrates constitute a vast source of low-carbon energy but also a significant environmental hazard due to potential large-scale emissions of methane as a potent greenhouse gas. , Meanwhile, synthetic clathrates are considered as the next generation material for fuel gas storage. − For example, hydrogen can be loaded into a hosting clathrate formed by tetrahydrofuran (THF) up to a mass fraction of 4.0 wt % . High storage capacity and slow liberation of gas upon dissociation enable efficient and safe storage of fuel gas based on clathrates. , Nevertheless, clathrates are a major safety hazard in the oil and gas industry.…”

Section: Introductionmentioning

confidence: 99%

Clathrate Adhesion Induced by Quasi-Liquid Layer

et al. 2021

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The adhesive force of clathrates to surfaces is a century-old problem of pipeline blockage for the energy industry. Here, we provide new physical insight into the origin of this force by accounting for the existence of a quasi-liquid layer (QLL) on clathrate surfaces. To gain this insight, we measure the adhesive force between a tetrahydrofuran clathrate and a solid sphere. We detect a strong adhesion, which originates from a capillary bridge that is formed from a nanometer-thick QLL on the clathrate surface. The curvature of this capillary bridge is nanoscaled, causes a large negative Laplace pressure, and leads to a strong capillary attraction. The microscopic capillary bridge expands and consolidates over time. This dynamic behavior explains the time-dependent increase of measured capillary forces. The adhesive force decreases greatly upon increasing the roughness and the hydrophobicity of the sphere, which founds the fundamental basics for reducing clathrate adhesion by using surface coating.

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Section: Introductionmentioning

confidence: 99%

Clathrate Adhesion Induced by Quasi-Liquid Layer

et al. 2021

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“…Clathrates are considered as the next-generation material for fuel gas storage. − They are host–guest inclusion structures in which water molecules coordinate via hydrogen bonding (H-bonding) to form a cage-like framework that serves as a host structure . “Guest” molecules with suitable sizes are incorporated into the regular cavities of the host structure. , In this way, the largest part of methane on Earth is encapsulated in natural clathrates, commonly named as combustible ice, − which constitute a vast untapped source of low-carbon energy that is far cleaner than oil and coal. ,,− Meanwhile, synthetic clathrates offer a rare opportunity for technical fuel gas storage .…”

Section: Introductionmentioning

confidence: 99%

“Liquid-like” Water in Clathrates Induced by Host–Guest Hydrogen Bonding

et al. 2021

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Clathrate structures are sustained by a host lattice formed by hydrogen-bonding water molecules, which encapsulates guest molecules. Up to now, all water molecules in the host lattice are considered ice-like crystallized. Here, we discovered the occurrence of “liquid-like” water molecules and the resulting defects in (polar) tetrahydrofuran clathrates by liquid-state 1H NMR experiments. The liquid-like water molecules start occurring at 271 K, well below the apparent dissociation point (277 K) of the clathrate matrix, via extracting water molecules from the host lattice by host–guest H-bonding. We found an intriguing two-stage dissociation of the clathrate: Partial dissociation at 271 K converting one-third of water molecules into liquid-like followed by complete dissociation at 277 K. The clathrate structure is molecularly heterogeneous in the region between 271 K and 277 K. No liquid-like water exists in (nonpolar) cyclopentane clathrates. This work uncovers the essentiality of host–guest interaction for clathrate structures and the ability to tune their stability using polar molecules.

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“…Methane-bearing natural hydrates in the seabed and permafrost sediments present a vast source of “frozen energy” that is much cleaner than conventional fossil fuels such as coal and crude oil. − These natural hydrates are seen as a source of cleaner energy for the future. Synthetic hydrates, on the other hand, enable the development of more sustainable production processes. − For example, hydrogen can be loaded into hydrate structures up to 4.3 wt %, offering a rare opportunity for a safe and efficient hydrogen storage technology. , Such a novel way of hydrogen storage is important for the development of hydrogen economy in which the storage of hydrogen is a standing challenge. − Likewise, the use of hydrates for capturing and storing carbon dioxide has been proven to be energy-efficient. − ,− Besides these usages, hydrates create notable challenges for sustainability. Vast volumes of natural hydrates on Earth pose a significant environmental hazard due to potential mass releases of methane as a potent greenhouse gas. , The formation of hydrates in oil and gas pipelines leads to flow blockages and severe impacts on drilling operations and the marine environment. − …”

Section: Introductionmentioning

confidence: 99%

Surface Science in the Research and Development of Hydrate-Based Sustainable Technologies

Nguyen

et al. 2022

ACS Sustainable Chem. Eng.

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Compact gas inclusion in hydrates presents not only fascinating science but also wide-ranging applications in sustainable energy and environmental technologies. The surface of hydrates dictates many essential phenomena underlying hydrate-based processes such as hydrate nucleation and growth, mass transfer, heat transfer, agglomeration, adhesion, and adsorption. Thus, surface science falls within the core of hydrate science and engineering. This paper covers an insight perspective on surface science related to the research and development of hydrate-based sustainable technologies. We present insightful molecular views of hydrate surfaces with a focus on the interfacial premelting, and discuss how new fundamental advances benefit the sustainable engineering in the areas of greener and chemical-free flow assurance, energyefficient gas storage, carbon capture and storage, and recovery of methane (low-carbon energy) from natural hydrates. We highlight the prospects and challenges as well as stimulate future studies on this important topic.

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Gas hydrates in confined space of nanoporous materials: new frontier in gas storage technology

Abstract: Gas hydrates (clathrate hydrates, clathrates, or hydrates) are crystalline inclusion compounds composed of water and gas molecules. Methane hydrates, the most well-known gas hydrates, are considered a menace in flow...

Cited by 42 publications

References 257 publications

Clathrate Adhesion Induced by Quasi-Liquid Layer

Clathrate Adhesion Induced by Quasi-Liquid Layer

“Liquid-like” Water in Clathrates Induced by Host–Guest Hydrogen Bonding

Surface Science in the Research and Development of Hydrate-Based Sustainable Technologies

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