Study on the reaction of methane hydrate with gaseous CO2 by Raman imaging microscopy

Huang, Xing; Cai, Wenjiu; Zhan, Li; Lu, Hailong

doi:10.1016/j.ces.2020.115720

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…A Raman spectral imaging technique was used by Huang et al to carefully understand the in situ exchange process at a microscopic level. As the responses during C–H stretching of CH 4 (2900 cm –1 ) and C–O stretching of CO 2 (1300 cm –1 ) molecules differ from each other, Raman spectroscopy can comfortably distinguish between each of them as well as a larger hydrate cage from a smaller one.…”

Section: Laboratory Studies and Characterization Of The Gas Exchange ...mentioning

confidence: 99%

Section: Laboratory Studies and Characterization Of The Gas Exchange ...mentioning

confidence: 99%

“…A Raman spectral imaging technique was used by Huang et al 142 From the results they divided the exchange reaction into two stages, partial decomposition and inefficient replacement, as interpreted from Figure 10a, which shows the hydrate under white light and Figure 10b, which shows the Raman imaging which took around 12 to 34 h to generate according to processing resolution. Figure 10c shows the cluster analysis generated by algorithmic processing where the blue area shows the CH 4 dissociated microporous section, red color depicts the synthesized pure CH 4 hydrate, and green shows the binary CO 2 −CH 4 mixture.…”

Section: Laboratory Studies and Characterization Of The Gas Exchange ...mentioning

confidence: 99%

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Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

et al. 2023

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Natural gas hydrates are unconventional abundant hydrocarbon energy resources that can guarantee energy sustainability with little environmental impact. The solid nature of the resource, distinct thermodynamic characteristics, and accumulations at shallow depths make the existing conventional production techniques unviable. Among all the currently explored production techniques, the hydrate-based carbon capture and sequestration (HBCCS) technique is expected to improve production, proven to be geomechanically safer, and conceptualized to be environmentally friendly. In this carbon-neutral production concept, carbon emissions are effectively sequestered for the long-term. This review presents a comprehensive overview and perspective of the CO 2 exchange-based approach to extract methane (CH 4 ) from naturally occurring gas hydrate reserves, emphasizes its prospect as a suitable alternative according to the current energy demands and climate concerns, establishes its environmental and production challenges, and demonstrates the recent developments. This review focuses on the production aspect and discusses the mechanism of the exchange process, experimental and modeling studies, various in situ production tests using different techniques on multiple sediments, and production challenges associated with the exchange process. The aspects of geomechanics and possibilities of fracturing in hydrate reservoirs are also discussed elaborately. A suitable and effective technique is yet to be established to produce natural gas commercially by addressing the existing challenges like sand production, seafloor stability concerns, marine ecosystem problems, low production rate, uncontrolled dissociation, water production, etc. Although the CO 2 exchange-based method is thermodynamically favorable, rapid crystallization of CO 2 restricts mass transfer and prevents continuous exchange. The exchange process is also influenced by heat, salinity, residual water saturation, exchange gas composition, injection phase, injection pressure, sediment properties, etc. There is a need to study the CO 2 −CH 4 exchange process at a fundamental level and at a larger scale, to understand its intricacies. In tandem with comprehensively discussing the subject, this review has listed the issues that require tenable solutions, which shall be helpful to readers who wish to work on production from CH 4 hydrates using the CO 2 exchange process. Methane hydrates shall be one of the strategic energy sources to meet our growing energy requirements for a sustainable future.

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Section: Laboratory Studies and Characterization Of The Gas Exchange ...mentioning

confidence: 99%

Section: Laboratory Studies and Characterization Of The Gas Exchange ...mentioning

confidence: 99%

Section: Laboratory Studies and Characterization Of The Gas Exchange ...mentioning

confidence: 99%

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Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

et al. 2023

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“…Micro laser Raman spectroscopy has been widely used in various fields (Lin-Tao et al, 2007;Qin et al, 2007a,b;Burke, 2001;Hong-Rui et al, 2003;Wang and Yang, 2007;Liu et al, 2007;Liu et al, 2007). In recent years, domestic and international scholar have successfully applied it to study pure CH 4 , pure H 2 , pure CO 2 hydrate and binary systems, and it has certain advantages for the study of hydrate crystal microparameters (Susilo et al, 2007;Luzi et al, 2012;Huang et al, 2020). Liu Chang-ling et al (Liu et al, 2010) used a laser Raman spectrometer to calculate the corresponding hydration index and cage occupancy for an aqueous sodium dodecyl sulfate (SDS)methane system, a powder ice-methane system and a sandmethane system consisting of sand with different particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopic Study on a CO2-CH4-N2 Mixed-Gas Hydrate System

et al. 2021

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Accurate determination of the characteristics of coal mine gas separation products is the key for gas separation applications based on hydrate technology. Gas hydrates are synthesized from gases with two types of compositions (CO2-CH4-N2). The separation products were analyzed by in situ Raman spectroscopy. The crystal structure of the mixed-gas hydrate was determined, and the cage occupancy and hydration index were calculated based on the various vibrational modes of the molecules according to the “loose cage-tight cage” model and the Raman band area ratio combined with the van der Waals-Platteeuw model. The results show that the two mixed-gas hydrate samples both have a type I structure. Large cages of mixed-gas hydrate are mostly occupied by guest molecules, with large cage occupancies of 98.57 and 98.52%; however, small cages are not easy to occupy, with small cage occupancies of 29.93 and 33.87%. The average cage occupancies of these two hydrates are 81.41 and 82.36%, and the stability of the crystal structure of the mixed-gas hydrate in the presence of 75% CO2 is better than that of the mixed-gas hydrate in the presence of 70% CO2. The hydration indices of the two hydrate gas samples are 7.14 and 6.98, which are greater than the theoretical value of structure l.

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“…The Raman imaging technique is based on large numbers of independent, spatially-resolved Raman spectra (Stewart et al, 2012), which can yield information on the spatial distribution of Raman spectra for specific bond stretching, in the form of peak positions and peak integrated areas. Raman imaging has been applied to natural gas hydrate analysis (Schicks et al, 2010;Chazallon et al, 2021) and laboratory-based hydrate experiments (Huang et al, 2020).…”

mentioning

confidence: 99%

Raman Micro‐Imaging of the Coexistence of sI and sII Hydrates Formed from a Mixed Methane‐Propane Gas in a Confined Space

Cai

Zhan

Huang

et al. 2022

Acta Geologica Sinica (Eng)

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Natural gas hydrate contains a specific amount of heavy hydrocarbons, such as ethane, propane, etc., aside from the primary guest gas of methane. Although the coexistence of two or even three hydrate structures has been discovered at several hydrate sites, the requisite formation mechanism is still not well understood. In‐situ observation of the formation process of mixed methane‐propane hydrate in a confined space was conducted using confocal Raman imaging microscopy. The Raman imaging results reveal that sI methane hydrate and sII mixed methane‐propane hydrate are formed and coexist in the reaction system. In the confined space, the sI hydrate originates from the dissolved gas in water, while the sII hydrate is formed from free gas. The results obtained can help explain the coexistence of sI and sII hydrates found in natural hydrate samples, as well as providing insights into a possible dynamic scenario of hydrate reservoirs in geological history.

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Study on the reaction of methane hydrate with gaseous CO2 by Raman imaging microscopy

Cited by 8 publications

References 25 publications

Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

Raman Spectroscopic Study on a CO2-CH4-N2 Mixed-Gas Hydrate System

Raman Micro‐Imaging of the Coexistence of sI and sII Hydrates Formed from a Mixed Methane‐Propane Gas in a Confined Space

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