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Phase equilibria in the H2O–CO2 system between 250–330K and 0–1.7GPa: Stability of the CO2 hydrates and H2O-ice VI at CO2 saturation.

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Title: Phase equilibria in the H2O–CO2 system between 250–330K and 0–1.7GPa: Stability of the CO2 hydrates and H2O-ice VI at CO2 saturation.
Authors: Bollengier, Olivier1 olivier.bollengier@univ-nantes.fr, Choukroun, Mathieu2, Grasset, Olivier1, Le Menn, Erwan1, Bellino, Guillaume1, Morizet, Yann1, Bezacier, Lucile1, Oancea, Adriana1, Taffin, Cécile1, Tobie, Gabriel1
Source: Geochimica et Cosmochimica Acta. Oct2013, Vol. 119, p322-339. 18p.
Subjects: Water, Carbon dioxide, Phase equilibrium, Hydrates, Planetary atmospheres, Atmospheric pressure, Atmospheric temperature
Abstract: Abstract: Although carbon dioxide is of interest in planetary science, few studies have been devoted so far to the H2O–CO2 system at pressures and temperatures relevant to planetary interiors, especially of the icy moons of the giant planets. In this study, new sapphire and diamond anvil cell experiments were conducted in this binary system to constrain the stability of the CO2 hydrates and H2O-ice VI at CO2 saturation in the 250–330K and 0–1.7GPa temperature and pressure ranges. Phases and equilibria were characterized by in situ Raman spectroscopy and optical monitoring. The equilibrium between the CO2 sI clathrate hydrate and the H2O-rich liquid phase was constrained over the entire pressure range of stability of the hydrate, up to 0.7–0.8GPa, with results in agreement with previous studies at lower pressures. Above this pressure and below 1GPa, our experiments confirmed the existence of the new CO2 high-pressure hydrate reported recently. Finally, the melting curve of the H2O-ice VI at CO2 saturation in the absence of CO2 hydrates was determined between 0.8 and 1.7GPa. Using an available chemical potential model for H2O, a first assessment of the solubility of CO2 along the H2O-ice VI melting curve is given. Consistent with these new results and previous studies of the H2O–CO2 system, a P–T–X description of the binary system is proposed. The evolution with pressure of the Raman signatures of the two CO2 hydrates is detailed, and their stability is discussed in light of other clathrate hydrate-forming systems. [Copyright &y& Elsevier]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 90011531
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Phase equilibria in the H<subscript>2</subscript>O–CO<subscript>2</subscript> system between 250–330K and 0–1.7GPa: Stability of the CO<subscript>2</subscript> hydrates and H<subscript>2</subscript>O-ice VI at CO<subscript>2</subscript> saturation.
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  Data: <searchLink fieldCode="AR" term="%22Bollengier%2C+Olivier%22">Bollengier, Olivier</searchLink><relatesTo>1</relatesTo><i> olivier.bollengier@univ-nantes.fr</i><br /><searchLink fieldCode="AR" term="%22Choukroun%2C+Mathieu%22">Choukroun, Mathieu</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Grasset%2C+Olivier%22">Grasset, Olivier</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Le+Menn%2C+Erwan%22">Le Menn, Erwan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bellino%2C+Guillaume%22">Bellino, Guillaume</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Morizet%2C+Yann%22">Morizet, Yann</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bezacier%2C+Lucile%22">Bezacier, Lucile</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Oancea%2C+Adriana%22">Oancea, Adriana</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Taffin%2C+Cécile%22">Taffin, Cécile</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tobie%2C+Gabriel%22">Tobie, Gabriel</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Oct2013, Vol. 119, p322-339. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Water%22">Water</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide%22">Carbon dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+equilibrium%22">Phase equilibrium</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrates%22">Hydrates</searchLink><br /><searchLink fieldCode="DE" term="%22Planetary+atmospheres%22">Planetary atmospheres</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+pressure%22">Atmospheric pressure</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+temperature%22">Atmospheric temperature</searchLink>
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  Label: Abstract
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  Data: Abstract: Although carbon dioxide is of interest in planetary science, few studies have been devoted so far to the H2O–CO2 system at pressures and temperatures relevant to planetary interiors, especially of the icy moons of the giant planets. In this study, new sapphire and diamond anvil cell experiments were conducted in this binary system to constrain the stability of the CO2 hydrates and H2O-ice VI at CO2 saturation in the 250–330K and 0–1.7GPa temperature and pressure ranges. Phases and equilibria were characterized by in situ Raman spectroscopy and optical monitoring. The equilibrium between the CO2 sI clathrate hydrate and the H2O-rich liquid phase was constrained over the entire pressure range of stability of the hydrate, up to 0.7–0.8GPa, with results in agreement with previous studies at lower pressures. Above this pressure and below 1GPa, our experiments confirmed the existence of the new CO2 high-pressure hydrate reported recently. Finally, the melting curve of the H2O-ice VI at CO2 saturation in the absence of CO2 hydrates was determined between 0.8 and 1.7GPa. Using an available chemical potential model for H2O, a first assessment of the solubility of CO2 along the H2O-ice VI melting curve is given. Consistent with these new results and previous studies of the H2O–CO2 system, a P–T–X description of the binary system is proposed. The evolution with pressure of the Raman signatures of the two CO2 hydrates is detailed, and their stability is discussed in light of other clathrate hydrate-forming systems. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.gca.2013.06.006
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 322
    Subjects:
      – SubjectFull: Water
        Type: general
      – SubjectFull: Carbon dioxide
        Type: general
      – SubjectFull: Phase equilibrium
        Type: general
      – SubjectFull: Hydrates
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      – SubjectFull: Planetary atmospheres
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      – SubjectFull: Atmospheric pressure
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      – SubjectFull: Atmospheric temperature
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      – TitleFull: Phase equilibria in the H2O–CO2 system between 250–330K and 0–1.7GPa: Stability of the CO2 hydrates and H2O-ice VI at CO2 saturation.
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              Text: Oct2013
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              Y: 2013
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