Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates
The exchange of CH4 by CO2 in gas hydrates is of interest for the production of natural gas from methane hydrate with net zero climate gas balance, and for managing risks that are related to sediment destabilization and mobilization after gas-hydrate dissociation. Several experimental studies on the...
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2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/52122/ https://oceanrep.geomar.de/id/eprint/52122/1/energies-14-01763.pdf https://oceanrep.geomar.de/id/eprint/52122/2/energies-14-01763-s001.pdf https://doi.org/10.3390/en14061763 |
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ftoceanrep:oai:oceanrep.geomar.de:52122 2024-02-11T10:05:49+01:00 Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates Kossel, Elke Bigalke, Nikolaus Deusner, Christian Haeckel, Matthias 2021-03-22 text https://oceanrep.geomar.de/id/eprint/52122/ https://oceanrep.geomar.de/id/eprint/52122/1/energies-14-01763.pdf https://oceanrep.geomar.de/id/eprint/52122/2/energies-14-01763-s001.pdf https://doi.org/10.3390/en14061763 en eng MDPI https://oceanrep.geomar.de/id/eprint/52122/1/energies-14-01763.pdf https://oceanrep.geomar.de/id/eprint/52122/2/energies-14-01763-s001.pdf Kossel, E. , Bigalke, N., Deusner, C. and Haeckel, M. (2021) Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates. Open Access Energies, 14 (6). Art.Nr. 1763. DOI 10.3390/en14061763 <https://doi.org/10.3390/en14061763>. doi:10.3390/en14061763 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.3390/en14061763 2024-01-15T00:23:13Z The exchange of CH4 by CO2 in gas hydrates is of interest for the production of natural gas from methane hydrate with net zero climate gas balance, and for managing risks that are related to sediment destabilization and mobilization after gas-hydrate dissociation. Several experimental studies on the dynamics and efficiency of the process exist, but the results seem to be partly inconsistent. We used confocal Raman spectroscopy to map an area of several tens to hundreds µm of a CH4 hydrate sample during its exposure to liquid and gaseous CO2. On this scale, we could identify and follow different processes in the sample that occur in parallel. Next to guest-molecule exchange, gas-hydrate dissociation also contributes to the release of CH4. During our examination period, about 50% of the CO2 was bound by exchange for CH4 molecules, while the other half was bound by new formation of CO2 hydrates. We evaluated single gas-hydrate grains with confirmed gas exchange and applied a diffusion equation to quantify the process. Obtained diffusion coefficients are in the range of 10−13–10−18 m2/s. We propose to use this analytical diffusion equation for a simple and robust modeling of CH4 production by guest-molecule exchange and to combine it with an additional term for gas-hydrate dissociation. Article in Journal/Newspaper Methane hydrate OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Energies 14 6 1763 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The exchange of CH4 by CO2 in gas hydrates is of interest for the production of natural gas from methane hydrate with net zero climate gas balance, and for managing risks that are related to sediment destabilization and mobilization after gas-hydrate dissociation. Several experimental studies on the dynamics and efficiency of the process exist, but the results seem to be partly inconsistent. We used confocal Raman spectroscopy to map an area of several tens to hundreds µm of a CH4 hydrate sample during its exposure to liquid and gaseous CO2. On this scale, we could identify and follow different processes in the sample that occur in parallel. Next to guest-molecule exchange, gas-hydrate dissociation also contributes to the release of CH4. During our examination period, about 50% of the CO2 was bound by exchange for CH4 molecules, while the other half was bound by new formation of CO2 hydrates. We evaluated single gas-hydrate grains with confirmed gas exchange and applied a diffusion equation to quantify the process. Obtained diffusion coefficients are in the range of 10−13–10−18 m2/s. We propose to use this analytical diffusion equation for a simple and robust modeling of CH4 production by guest-molecule exchange and to combine it with an additional term for gas-hydrate dissociation. |
format |
Article in Journal/Newspaper |
author |
Kossel, Elke Bigalke, Nikolaus Deusner, Christian Haeckel, Matthias |
spellingShingle |
Kossel, Elke Bigalke, Nikolaus Deusner, Christian Haeckel, Matthias Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates |
author_facet |
Kossel, Elke Bigalke, Nikolaus Deusner, Christian Haeckel, Matthias |
author_sort |
Kossel, Elke |
title |
Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates |
title_short |
Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates |
title_full |
Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates |
title_fullStr |
Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates |
title_full_unstemmed |
Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates |
title_sort |
microscale processes and dynamics during ch4–co2 guest molecule exchange in gas hydrates |
publisher |
MDPI |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/52122/ https://oceanrep.geomar.de/id/eprint/52122/1/energies-14-01763.pdf https://oceanrep.geomar.de/id/eprint/52122/2/energies-14-01763-s001.pdf https://doi.org/10.3390/en14061763 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://oceanrep.geomar.de/id/eprint/52122/1/energies-14-01763.pdf https://oceanrep.geomar.de/id/eprint/52122/2/energies-14-01763-s001.pdf Kossel, E. , Bigalke, N., Deusner, C. and Haeckel, M. (2021) Microscale Processes and Dynamics during CH4–CO2 Guest Molecule Exchange in Gas Hydrates. Open Access Energies, 14 (6). Art.Nr. 1763. DOI 10.3390/en14061763 <https://doi.org/10.3390/en14061763>. doi:10.3390/en14061763 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3390/en14061763 |
container_title |
Energies |
container_volume |
14 |
container_issue |
6 |
container_start_page |
1763 |
_version_ |
1790603011789160448 |