Applications of Clathrate (Gas) Hydrates

Englezos, Peter

doi:10.1002/9783527695058.ch16

Cited by 12 publications

(17 citation statements)

References 114 publications

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“…Structural optimization and vibrational energy studies of 5 12 , 5 12 6 2 , and 5 12 6 4 CH cages and ethane included 5 12 , 5 12 6 2 , and 5 12 6 4 CH cages were performed at B3LYP/6-311++G(d,p) level of theory. The molecular structures of 5 12 , 5 12 6 2 , and 5 12 6 4 CH cages reported by Ningru Sun et al 37 were considered for the calculations. The CH cages were optimized structurally, and their vibrational modes were calculated.…”

Section: ■ Computational Detailsmentioning

confidence: 99%

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Formation of Ethane Clathrate Hydrate in Ultrahigh Vacuum by Thermal Annealing

et al. 2022

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The existence of many molecules in the form of clathrate hydrates (CHs) in ultrahigh vacuum (UHV) and cryogenic conditions has not been explored adequately. In the present study, a detailed investigation by reflection absorption infrared spectroscopy confirmed that the three phases of ethane, i.e., amorphous, crystalline, and CH, coexist in a vapor-deposited ethane−water mixture at 60 K in UHV. Experiments were conducted with vapor-deposited ice films at 10 K, which were annealed to 60 K for tens of hours, and the IR spectral evolution was monitored systematically. Upon maintaining the system at 60 K, three phases of ethane were seen to coexist, but a gradual increase in the hydrate phase was noticed. The evolution of ethane CH from the amorphous ethane−water ice mixture was observed for the very first time in UHV under cryogenic conditions. The formation of the CH was further confirmed by temperature-programmed desorption (TPD) mass spectrometry. Quantum chemical calculation suggested the formation of 5 12 6 2 cage of structure I CH in the ice matrix. The formation of ethane CH in a thin ice film at such a low temperature under UHV suggests its existence in the cometary environment.

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Section: ■ Computational Detailsmentioning

confidence: 99%

“…10 The capability of forming these structures depends mainly upon the pressure and temperature conditions. 11 Macroscopic deposits of hydrates generally occur at higher pressures, 12 typically greater than 25 atm for methane. 13,14 CHs are also known to exist in vacuum, even under cryogenic conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

Formation of Ethane Clathrate Hydrate in Ultrahigh Vacuum by Thermal Annealing

et al. 2022

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“…In general, the compression costs are significant . This necessitates the use of additives to reduce the required pressure to nearly atmospheric conditions in order to have realistic prospects for this technology . For example, in a proposed application to a cement plant the use of the semiclathrate former tetra- n -butyl ammonium bromide (TBAB) was adopted .…”

Section: Introductionmentioning

confidence: 99%

“…12 This necessitates the use of additives to reduce the required pressure to nearly atmospheric conditions in order to have realistic prospects for this technology. 14 For example, in a proposed application to a cement plant the use of the semiclathrate former tetra-n-butyl ammonium bromide (TBAB) was adopted. 15 In fact, TBAB as well as tetra-nbutylammonium fluoride (TBAF) have been popular additives for the hydrate process with semiclathrates.…”

Section: ■ Introductionmentioning

confidence: 99%

A Dual-Bed Cyclic Gas Hydrate Process (DB-CGHP) for Carbon Dioxide Capture and Other Gas Separations

Sharifi¹,

Englezos

2022

Energy Fuels

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A new apparatus that consists of two 9 L fixed-bed hydrate crystallizers that can operate at the scale of several kilograms per day was designed and built to demonstrate the use of the hydrate process for CO2 capture and in other gas separations of industrial interest. The apparatus is described together with the concept of a dual-bed cyclic gas hydrate process (DB-CGHP). The process was used for the precombustion capture from a CO2/H2 gas mixture. The process operates on a semibatch or batch manner, and if one employs a battery of such hydrate reactors and coordinates the formation/decomposition cycles, a pseudocontinuous operation emerges.

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“…It is also noted that biogas, landfill gas, and coalbed methane usually contain the component CO 2 . , To increase the gas purity and reduce the corrosion of gas pipelines by CO 2 , the removal of CO 2 from such gas mixtures is needed. One of the approaches to purify these gas mixtures is based on gas hydrate crystallization. − …”

Section: Introductionmentioning

confidence: 99%

Minireview of Hydrate-Based CO₂ Separation from a CO₂/CH₄ Gas Mixture: Progress and Outlook

Xie

et al. 2022

Energy Fuels

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Hydrate-based gas separation is a promising method for CO2 capture from CO2/CH4 gas mixtures, and with improved gas separation efficiency, rate of hydrate formation, and gas uptake, this process has the potential to be taken from the lab scale to industry. In this regard, a significant body of work has been conducted in recent years with the aim to enhance the kinetics of the hydrate-based CO2 capture process. The present study presents a review of the kinetic studies performed on the enhancement of hydrate-based CO2 capture from CO2/CH4 in terms of using additives, porous media, nanofluids, etc. Future research directions are also discussed. The present review aims to aid understanding of the mechanism of the hydrate-based CO2 capture process and to provide references for the development of hydrate-based CO2 capture technology toward industrial applications in the near future.

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Applications of Clathrate (Gas) Hydrates

Cited by 12 publications

References 114 publications

Formation of Ethane Clathrate Hydrate in Ultrahigh Vacuum by Thermal Annealing

Formation of Ethane Clathrate Hydrate in Ultrahigh Vacuum by Thermal Annealing

A Dual-Bed Cyclic Gas Hydrate Process (DB-CGHP) for Carbon Dioxide Capture and Other Gas Separations

Minireview of Hydrate-Based CO₂ Separation from a CO₂/CH₄ Gas Mixture: Progress and Outlook

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Applications of Clathrate (Gas) Hydrates

Cited by 12 publications

References 114 publications

Formation of Ethane Clathrate Hydrate in Ultrahigh Vacuum by Thermal Annealing

Formation of Ethane Clathrate Hydrate in Ultrahigh Vacuum by Thermal Annealing

A Dual-Bed Cyclic Gas Hydrate Process (DB-CGHP) for Carbon Dioxide Capture and Other Gas Separations

Minireview of Hydrate-Based CO2 Separation from a CO2/CH4 Gas Mixture: Progress and Outlook

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Product

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Minireview of Hydrate-Based CO₂ Separation from a CO₂/CH₄ Gas Mixture: Progress and Outlook