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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
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Volume 100, Issue 5-6

Issues

Insights into the structure of mixed CO2/CH4 in gas hydrates

S. Michelle Everett
  • Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-2100, U.S.A.
  • Present address: Scientific Activities Division, European Spallation Source, Lund, Sweden
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/ Claudia J. Rawn
  • Corresponding author
  • Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-2100, U.S.A.
  • Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6064, U.S.A.
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/ Bryan C. Chakoumakos
  • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473, U.S.A.
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/ David J. Keffer
  • Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996-2100, U.S.A.
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/ Ashfia Huq
  • Chemistry and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6475, U.S.A.
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/ Tommy J. Phelps
Published Online: 2015-05-12 | DOI: https://doi.org/10.2138/am-2015-4929

Abstract

The exchange of carbon dioxide for methane in natural gas hydrates is an attractive approach to harvesting CH4 for energy production while simultaneously sequestering CO2. In addition to the energy and environmental implications, the solid solution of clathrate hydrate (CH4)1-x(CO2)x·5.75H2O provides a model system to study how the distinct bonding and shapes of CH4 and CO2 influence the structure and properties of the compound. High-resolution neutron diffraction was used to examine mixed CO2/CH4 gas hydrates. CO2-rich hydrates had smaller lattice parameters, which were attributed to the higher affinity of the CO2 molecule interacting with H2O molecules that form the surrounding cages, and resulted in a reduction in the unit-cell volume. Experimental nuclear scattering densities illustrate how the cage occupants and energy landscape change with composition. These results provide important insights on the impact and mechanisms for the structure of mixed CH4/CO2 gas hydrate.

Keywords: Neutron diffraction; methane hydrate; carbon dioxide/methane exchange; Fourier density maps

About the article

Received: 2014-02-11

Accepted: 2014-11-08

Published Online: 2015-05-12

Published in Print: 2015-05-01


Citation Information: American Mineralogist, Volume 100, Issue 5-6, Pages 1203–1208, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2015-4929.

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© 2015 by Walter de Gruyter Berlin/Boston.

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