The effects of graphene oxide nanosheets and Al2O3 nanoparticles on the kinetics of methane + THF hydrate formation at moderate conditions

Javidani, Amir Mohammad; Abedi‐Farizhendi, Saeid; Mohammadi, Abolfazl; Hassan, Hussein; Mohammadi, Amir H.; Manteghian, Mehrdad

doi:10.1016/j.molliq.2020.113872

Cited by 38 publications

(16 citation statements)

References 54 publications

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“…There have been a limited number of studies on surface-promoted nucleation of hydrates (a passive technique for nucleation promotion). Metals and metal oxide suspensions have been experimentally shown to assist in nucleation promotion and have also been studied in conjunction with surfactants. − Passive promotion and the underlying mechanisms have also been studied via molecular dynamics simulations. − A recent discovery by the present group involved the use of aluminum surfaces to promote the nucleation of CO 2 hydrates . Statistically significant measurements showed CO 2 hydrates nucleating in ∼3 h on aluminum surfaces (with no nucleation observed in the absence of aluminum).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Kar

Acharya

Bhati

et al. 2021

ACS Sustainable Chem. Eng.

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“…10–15. However, the gas separation and storage through hydrate formation has two main restrictions: (1) hydrate formation takes place typically under high pressure and low temperature and (2) the rate of hydrate formation is normally slow 16. The weakness in the variability of pressure and temperature could be solved by using thermodynamic promoters.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, they cause heterogeneous nucleation during crystallization, which helps the hydrate nucleation to take place more easily. Manteghian and co‐workers found that GO nanosheets could reduce the induction time and increase the gas consumption of methane, propane, and ethylene hydrates 16, 39–41.…”

Section: Introductionmentioning

confidence: 99%

Effects of Graphene Oxide Nanosheets and Al₂O₃Nanoparticles on CO₂Uptake in Semi‐clathrate Hydrates

et al. 2020

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Gas hydrate/clathrate hydrate formation is an innovative method to trap CO2 into hydrate cages under appropriate thermodynamic and/or kinetic conditions. Due to their excellent surface properties, nanoparticles can be utilized as hydrate kinetic promoters. Here, the kinetics of the CO2 + tetra‐n‐butyl ammonium bromide (TBAB) semi‐clathrate hydrates system in the presence of two distinct nanofluid suspensions containing graphene oxide (GO) nanosheets and Al2O3 nanoparticles is evaluated. The results reveal that the kinetics of hydrate formation is inhibited by increasing the weight fraction of TBAB in aqueous solution. GO and Al2O3 are the most effective kinetic promoters for hydrates of (CO2 + TBAB). Furthermore, the aqueous solutions of TBAB + GO or Al2O3 noticeably increase the storage capacity compared to TBAB aqueous solution systems.

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“…1−6 Methane hydrate forms at high pressures and low temperatures, and its gas storage capacity is relatively low when formed in pure water under static conditions. 2,7 To scale up these technologies by hydrate formation, some challenges were made. Methane hydrate formation conditions (high pressures and low temperatures) are the drawbacks in the way of industrialization.…”

Section: Introductionmentioning

confidence: 99%

“…Gas hydrates, or clathrate hydrates, have many potential industrial applications such as gas storage, natural gas transportation, separation and desalination, cold storage, air conditioning, and so forth. − Methane hydrate forms at high pressures and low temperatures, and its gas storage capacity is relatively low when formed in pure water under static conditions. , To scale up these technologies by hydrate formation, some challenges were made. Methane hydrate formation conditions (high pressures and low temperatures) are the drawbacks in the way of industrialization. , Many researchers have been working on methane hydrate stability conditions from the thermodynamics point of view to moderate the conditions using thermodynamic promoters …”

Section: Introductionmentioning

confidence: 99%

Hydrate Phase Equilibria of Methane + TBAC + Water System in the Presence and Absence of NaCl and/or MgCl₂

et al. 2020

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Gas hydrate technology has a great potential for natural gas storage and transportation on the industrial scale. The required water for hydrate formation could be supplied from the sea and river water, in which the dissolved salts inhibit the formation of hydrate. Some additives like tetra-n-butyl ammonium chloride (TBAC), which can form semiclathrate structures, can promote the thermodynamic stability conditions of hydrate formation. Although sufficient phase equilibrium data of TBAC semiclathrate hydrates of methane seem to be available, there are some discrepancies in the phase equilibrium data, particularly for the 0.05, 0.3, and 0.34 mass fractions of TBAC. Furthermore, the phase equilibrium data of TBAC in the presence of NaCl, MgCl2, and mixed NaCl + MgCl2 have not been reported in the literature yet. In this work, first, the hydrate phase equilibrium data of TBAC + CH4 were obtained accurately. In the next phase, the effects of NaCl and/or MgCl2 on the phase stability conditions of TBAC + CH4 hydrate systems were studied. The experiments were conducted with the TBAC aqueous solution at two concentrations of 0.05 and 0.20 mass fractions in the absence and presence of NaCl (0.05 mass fraction), MgCl2 (0.05 mass fraction), and NaCl + MgCl2 (0.05 + 0.05 mass fractions). The phase equilibrium data were reported in the pressure and temperature ranges of (1.27–5.46 MPa) and (282.2–291.8 K), respectively. Equilibrium data show that the presence of NaCl and/or MgCl2 (0.05 mass fraction) + TBAC (0.05 mass fraction) in an aqueous solution has synergetic effects on the promotion of the stability conditions of methane hydrate as compared to that of TBAC (0.05 mass fraction). At a higher concentration of TBAC (0.20 mass fraction), the mineral salts play the role of an inhibitor and shift the methane + TBAC hydrate phase equilibrium curve to the left side. The hydrate dissociation data generated in this work show that TBAC can promote the stability conditions and improve the stability of methane in the presence of the mineral salts effectively.

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The effects of graphene oxide nanosheets and Al2O3 nanoparticles on the kinetics of methane + THF hydrate formation at moderate conditions

Cited by 38 publications

References 54 publications

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Effects of Graphene Oxide Nanosheets and Al₂O₃Nanoparticles on CO₂Uptake in Semi‐clathrate Hydrates

Hydrate Phase Equilibria of Methane + TBAC + Water System in the Presence and Absence of NaCl and/or MgCl₂

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The effects of graphene oxide nanosheets and Al2O3 nanoparticles on the kinetics of methane + THF hydrate formation at moderate conditions

Cited by 38 publications

References 54 publications

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Magnesium-Promoted Rapid Nucleation of Carbon Dioxide Hydrates

Effects of Graphene Oxide Nanosheets and Al2O3Nanoparticles on CO2Uptake in Semi‐clathrate Hydrates

Hydrate Phase Equilibria of Methane + TBAC + Water System in the Presence and Absence of NaCl and/or MgCl2

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Product

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Effects of Graphene Oxide Nanosheets and Al₂O₃Nanoparticles on CO₂Uptake in Semi‐clathrate Hydrates

Hydrate Phase Equilibria of Methane + TBAC + Water System in the Presence and Absence of NaCl and/or MgCl₂