The structure of CO2 hydrate between 0.7 and 1.0 GPa
Abstract
A deuterated sample of CO2 structure I (sI) clathrate hydrate (CO2 ∙ 8.3 D2O) has been formed and neutron diffraction experiments up to 1.0 GPa at 240 K were performed. The sI CO2 hydrate transformed at 0.7 GPa into the high pressure phase that had been observed previously by Hirai, et al. (J. Phys. Chem. 133, 124511 (2010)) and O. Bollengier et al. (Geochim. Cosmochim. AC. 119, 322 (2013)), but which had not been structurally identified. The current neutron diffraction data were successfully fitted to a filled ice structure with CO2 molecules filling the water channels. This CO2+water system has also been investigated using classical molecular dynamics and density functional ab initio methods to provide additional characterization of the high pressure structure. Both models indicate the water network adapts an MH-III ‘like’ filled ice structure with considerable disorder of the orientations of the CO2molecule. Furthermore, the disorder appears be a direct result of the level of proton disorder in the water network. In contrast to the conclusions of Bollengier et al. our neutron diffraction data shows that the filled ice phase can be recovered to ambient pressure (0.1 MPa) at 96 K, and recrystallization to sI hydrate occurs upon subsequentmore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Science Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Science Division; Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
- National Research Council of Canada (NRC), Ottawa, ON (Canada)
- Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1286804
- Alternate Identifier(s):
- OSTI ID: 1224280
- Grant/Contract Number:
- AC05-00OR22725; SC0001057
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 141; Journal Issue: 17; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Tulk, Chris A., Machida, Shinichi, Klug, Dennis D., Lu, H., Guthrie, Malcolm, and Molaison, Jamie J. The structure of CO2 hydrate between 0.7 and 1.0 GPa. United States: N. p., 2014.
Web. doi:10.1063/1.4899265.
Tulk, Chris A., Machida, Shinichi, Klug, Dennis D., Lu, H., Guthrie, Malcolm, & Molaison, Jamie J. The structure of CO2 hydrate between 0.7 and 1.0 GPa. United States. https://doi.org/10.1063/1.4899265
Tulk, Chris A., Machida, Shinichi, Klug, Dennis D., Lu, H., Guthrie, Malcolm, and Molaison, Jamie J. Wed .
"The structure of CO2 hydrate between 0.7 and 1.0 GPa". United States. https://doi.org/10.1063/1.4899265. https://www.osti.gov/servlets/purl/1286804.
@article{osti_1286804,
title = {The structure of CO2 hydrate between 0.7 and 1.0 GPa},
author = {Tulk, Chris A. and Machida, Shinichi and Klug, Dennis D. and Lu, H. and Guthrie, Malcolm and Molaison, Jamie J.},
abstractNote = {A deuterated sample of CO2 structure I (sI) clathrate hydrate (CO2 ∙ 8.3 D2O) has been formed and neutron diffraction experiments up to 1.0 GPa at 240 K were performed. The sI CO2 hydrate transformed at 0.7 GPa into the high pressure phase that had been observed previously by Hirai, et al. (J. Phys. Chem. 133, 124511 (2010)) and O. Bollengier et al. (Geochim. Cosmochim. AC. 119, 322 (2013)), but which had not been structurally identified. The current neutron diffraction data were successfully fitted to a filled ice structure with CO2 molecules filling the water channels. This CO2+water system has also been investigated using classical molecular dynamics and density functional ab initio methods to provide additional characterization of the high pressure structure. Both models indicate the water network adapts an MH-III ‘like’ filled ice structure with considerable disorder of the orientations of the CO2molecule. Furthermore, the disorder appears be a direct result of the level of proton disorder in the water network. In contrast to the conclusions of Bollengier et al. our neutron diffraction data shows that the filled ice phase can be recovered to ambient pressure (0.1 MPa) at 96 K, and recrystallization to sI hydrate occurs upon subsequent heating to 150 K, possibly by first forming low density amorphous ice. Unlike other clathrate hydrate systems, which transform from the sI or sII structure to the hexagonal structure (sH) then to the filled ice structure, CO2 hydrate transforms directly from the sI form to the filled ice structure.},
doi = {10.1063/1.4899265},
journal = {Journal of Chemical Physics},
number = 17,
volume = 141,
place = {United States},
year = {Wed Nov 05 00:00:00 EST 2014},
month = {Wed Nov 05 00:00:00 EST 2014}
}
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