Molecular insight into carbon dioxide hydrate formation from saline solution

Liu, Chanjuan; Zhou, Xuebing; Liang, Deqing

doi:10.1039/d1ra04015d

Cited by 11 publications

(15 citation statements)

References 54 publications

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“…The investigation by Liu et al 4 provides a detailed molecular-level sympathetic view of hydrate cage arrangement and growth. The study unveiled insightful findings regarding the impact of temperature, pressure, and salinity on CO 2 hydrate formation and stability.…”

Section: Optimizing Co 2 Hydrate Formation and Stability Via Thermal ...mentioning

confidence: 99%

“…2,3 Initially regarded as a geological curiosity, the understanding of gas hydrates matured gradually, laying the groundwork for exploring their potential applications in CO 2 capture and storage. 2,4 The turn of the 21st century marked an essential era for climate change discussions, propelling intensified efforts toward mitigating CO 2 emissions. 5 Researchers and policymakers alike sought innovative methods to sequester CO 2 , leading to a surge in studies exploring the feasibility of storing CO 2 within gas hydrates, particularly in subseafloor environments.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Review and Perspectives of CO₂ Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Kasala,

Fang,

Wang

et al. 2024

Energy Fuels

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Exploring various strategies for CO 2 hydrate storage in subseafloor saline sediments reveals a promising yet challenging path toward mitigating anthropogenic CO 2 emissions and advancing clean energy development. Research has revealed the efficacy of sediment-specific modifications, including the use of inorganic emulsifiers, L-leucine (an amino acid), and nanoparticle coatings, in enhancing CO 2 hydrate formation stability and storage capacity. These modifications aid in overcoming the challenges posed by the harsh environmental conditions of salinity and sediment heterogeneity, providing increased stability, enhanced CO 2 adsorption efficiency, and reduced induction time. Furthermore, advancements in nanomaterials have introduced nanostructured encapsulation systems capable of confining and stabilizing CO 2 within a solid matrix under fluctuating pressure, temperature, and salinity conditions. Incorporating nanoparticles into polymers and surfactants yields a nanofluid that exhibits increased stability, improved wettability, interfacial tension (IFT) reduction, and elevated CO 2 hydrate storage efficiency, with the synergistic effects of these components playing a critical role. Moreover, innovative thermal and pressure manipulation strategies, alongside the integration of kinetic promoters, have shown significant potential in optimizing CO 2 hydrate formation kinetics and enhancing longterm stability. These strategies involve novel electrical heating systems, pressure management techniques, and chemical additives that collectively contribute to increased hydrate formation rates and gas storage capacities. Despite these promising developments, the field faces several challenges, including optimizing encapsulation materials to match geological characteristics, the long-term stability of CO 2 hydrates under extreme conditions, and scaling laboratory experiments to field applications. Addressing these issues necessitates a multifaceted approach, incorporating empirical data and theoretical insights to design, screen, and formulate effective CO 2 hydrate storage solutions in subseafloor saline sediments.

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Section: Optimizing Co 2 Hydrate Formation and Stability Via Thermal ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive Review and Perspectives of CO₂ Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Kasala,

Fang,

Wang

et al. 2024

Energy Fuels

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“…At this point, depressurization was done by letting out all the unconverted CO 2 from the system. As pressure decreases, the temperature also decreases due to the Joule− Thomson effect, 68 and this leads to both hydrate formation and dissociation processes, but the formation process dominates 69 at this moment and could be seen from the window in Figure 16 at 0.5 h. As shown in Figure 16, reactor temperature (T1, T2, and T3) increases and reaches the water bath's temperature in about 2.5 h. Overall, for the system containing LCO 2 and freshwater without a promoter, CO 2 hydrate dissociated in 5.71 (±1.77) h [Video S9]. 3.3.4. Liquid CO 2 and Freshwater with the Promoter (System 4).…”

Section: Liquid Co 2 and Brine With The Promoter (System 2)mentioning

confidence: 99%

Investigating High-Pressure Liquid CO₂ Hydrate Formation, Dissociation Kinetics, and Morphology in Brine and Freshwater Static Systems

et al. 2023

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Carbon capture and storage [CCS] is crucial for mitigating CO2 emissions. One of the potential CCS concepts is to compress and store the captured CO2 into deep oceanic sediments as gas hydrates. However, seawater is highly saline [brine], which may impair the formation/dissociation kinetics and storage of CO2 hydrates. Therefore, it is essential to understand the liquid CO2 [LCO2] hydrate formation and dissociation kinetics in static brine systems. In this experimental study, we have examined the formation/dissociation kinetics and morphology of high-pressure LCO2 hydrates in brine using a static [unstirred] high-pressure crystallizer at deep oceanic [1 km] thermodynamic conditions [10 MPa, 1–2 °C]. The results are compared with [unstirred/stirred] freshwater systems with/without hydrate promoters. Three key stages have been identified in the experiments: nucleation [stage 1], LCO2-hydrate-brine film formation [stage 2], and LCO2-hydrate-brine film breakage [stage 3]. In the absence of stirring, the formation of the LCO2-hydrate-brine film resists the mass transfer of LCO2 into the brine, and most likely, the volume expansion during hydrate formation causes the LCO2-hydrate-brine film to break. New hydrate morphological growth patterns have been identified. It was estimated that the hydrate conversion in the freshwater system was higher [27.5% (±3.04%) in 21.1 (±1.26) h] compared to the brine system [25.0% in 24.2 (±0.58) h]. LCO2 hydrates dissociate faster in brine [1.7 (±0.14) h] compared to the freshwater system [5.7 (±1.77) h]. Finally, the presence of the eco-friendly hydrate promoter 500 ppm l-tryptophan can delay the dissociation process.

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“…Bai et al demonstrated that the NaCl solutions with a concentration of 3.5 wt % had a clear inhibition effect on both the nucleation and growth stages of the CH 4 hydrate formation by a molecular dynamics simulation method . Liu et al simulated the formation of CO 2 hydrate from NaCl solutions (concentration range from 0 to 20 wt %) at a molecular level and reported that the formation rate of CO 2 hydrate decreased with the increasing concentration of salt solutions, and the salt ions could not enter or absorb on the water molecule cages during the formation process. Maekawa experimentally determined the equilibrium conditions for methane–ethane mixed gas hydrate in 3.0 wt % NaCl solution and reported that the addition of the salt solution shifted the equilibrium conditions of the methane–ethane mixed gas hydrate to a lower temperature at a constant pressure …”

Section: Introductionmentioning

confidence: 99%

Nucleation of CO₂ Hydrate in Quasi-Free Droplets of Dilute Electrolytes

Zhang,

Li,

Maeda

2024

Energy Fuels

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Salts are known to be thermodynamic inhibitors of gas hydrates at high concentrations by lowering the activity of water and shifting the phase boundary of gas hydrates to lower temperatures and higher pressures. However, some salts have been reported to kinetically promote the formation of gas hydrates at low concentrations. Studies on kinetic promotions of clathrate hydrate formation in dilute salt solutions are rare, and the mechanisms are poorly understood. The impact of solid walls on heterogeneous nucleation of gas hydrates is complex and depends on the nature of the solid walls, and it is difficult to decouple the impact of solid walls from that of dilute electrolytes when they are present. In particular, a solid wall often becomes charged when in contact with an aqueous phase, and the binding of the counterions to the solid wall in an aqueous phase further complicates the investigations of heterogeneous nucleation of gas hydrates. Here, we investigated the nucleation rates of CO2 hydrate in quasi-free droplets of sodium chloride (NaCl) and potassium iodide (KI) at low concentrations (≤10 mM). The results showed that NaCl solution had no inhibition effect while KI solution had a weak promotion effect at low concentrations, and the nucleation rates were largely independent of the salt concentrations up to 10 mM. The impacts of dilute NaCl and KI solutions on the nucleation of CO2 hydrate in this study were broadly similar to the previous findings of the methane–propane mixed gas hydrates in Sowa et al.’s study.

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Molecular insight into carbon dioxide hydrate formation from saline solution

Abstract: In the process of the carbon dioxide hydrate formation in NaCl solution, it could form 512, 51262 and 51263 cages, and the 51262 cage and 512 cage number ratio was slightly above 3 : 1.

Cited by 11 publications

References 54 publications

Comprehensive Review and Perspectives of CO₂ Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Comprehensive Review and Perspectives of CO₂ Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Investigating High-Pressure Liquid CO₂ Hydrate Formation, Dissociation Kinetics, and Morphology in Brine and Freshwater Static Systems

Nucleation of CO₂ Hydrate in Quasi-Free Droplets of Dilute Electrolytes

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Molecular insight into carbon dioxide hydrate formation from saline solution

Abstract: In the process of the carbon dioxide hydrate formation in NaCl solution, it could form 512, 51262 and 51263 cages, and the 51262 cage and 512 cage number ratio was slightly above 3 : 1.

Cited by 11 publications

References 54 publications

Comprehensive Review and Perspectives of CO2 Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Comprehensive Review and Perspectives of CO2 Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Investigating High-Pressure Liquid CO2 Hydrate Formation, Dissociation Kinetics, and Morphology in Brine and Freshwater Static Systems

Nucleation of CO2 Hydrate in Quasi-Free Droplets of Dilute Electrolytes

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Comprehensive Review and Perspectives of CO₂ Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Comprehensive Review and Perspectives of CO₂ Hydrate Storage in Subseafloor Saline Sediments: Formation, Stability, and Optimization Strategies

Investigating High-Pressure Liquid CO₂ Hydrate Formation, Dissociation Kinetics, and Morphology in Brine and Freshwater Static Systems

Nucleation of CO₂ Hydrate in Quasi-Free Droplets of Dilute Electrolytes