Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates
The exchange of CH 4 by CO 2 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 t...
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ftdoajarticles:oai:doaj.org/article:eacd7706f81843a384e7bd855c927f06 2023-05-15T17:12:06+02:00 Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates Elke Kossel Nikolaus K. Bigalke Christian Deusner Matthias Haeckel 2021-03-01T00:00:00Z https://doi.org/10.3390/en14061763 https://doaj.org/article/eacd7706f81843a384e7bd855c927f06 EN eng MDPI AG https://www.mdpi.com/1996-1073/14/6/1763 https://doaj.org/toc/1996-1073 doi:10.3390/en14061763 1996-1073 https://doaj.org/article/eacd7706f81843a384e7bd855c927f06 Energies, Vol 14, Iss 1763, p 1763 (2021) gas hydrate CH 4 hydrate CO 2 hydrate mixed-gas hydrates guest-molecule exchange solid-state diffusion Technology T article 2021 ftdoajarticles https://doi.org/10.3390/en14061763 2022-12-30T20:28:19Z The exchange of CH 4 by CO 2 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 CH 4 hydrate sample during its exposure to liquid and gaseous CO 2 . 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 CH 4 . During our examination period, about 50% of the CO 2 was bound by exchange for CH 4 molecules, while the other half was bound by new formation of CO 2 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 m 2 /s. We propose to use this analytical diffusion equation for a simple and robust modeling of CH 4 production by guest-molecule exchange and to combine it with an additional term for gas-hydrate dissociation. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Energies 14 6 1763 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
gas hydrate CH 4 hydrate CO 2 hydrate mixed-gas hydrates guest-molecule exchange solid-state diffusion Technology T |
spellingShingle |
gas hydrate CH 4 hydrate CO 2 hydrate mixed-gas hydrates guest-molecule exchange solid-state diffusion Technology T Elke Kossel Nikolaus K. Bigalke Christian Deusner Matthias Haeckel Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates |
topic_facet |
gas hydrate CH 4 hydrate CO 2 hydrate mixed-gas hydrates guest-molecule exchange solid-state diffusion Technology T |
description |
The exchange of CH 4 by CO 2 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 CH 4 hydrate sample during its exposure to liquid and gaseous CO 2 . 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 CH 4 . During our examination period, about 50% of the CO 2 was bound by exchange for CH 4 molecules, while the other half was bound by new formation of CO 2 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 m 2 /s. We propose to use this analytical diffusion equation for a simple and robust modeling of CH 4 production by guest-molecule exchange and to combine it with an additional term for gas-hydrate dissociation. |
format |
Article in Journal/Newspaper |
author |
Elke Kossel Nikolaus K. Bigalke Christian Deusner Matthias Haeckel |
author_facet |
Elke Kossel Nikolaus K. Bigalke Christian Deusner Matthias Haeckel |
author_sort |
Elke Kossel |
title |
Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates |
title_short |
Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates |
title_full |
Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates |
title_fullStr |
Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates |
title_full_unstemmed |
Microscale Processes and Dynamics during CH 4 –CO 2 GuestMolecule Exchange in Gas Hydrates |
title_sort |
microscale processes and dynamics during ch 4 –co 2 guestmolecule exchange in gas hydrates |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/en14061763 https://doaj.org/article/eacd7706f81843a384e7bd855c927f06 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Energies, Vol 14, Iss 1763, p 1763 (2021) |
op_relation |
https://www.mdpi.com/1996-1073/14/6/1763 https://doaj.org/toc/1996-1073 doi:10.3390/en14061763 1996-1073 https://doaj.org/article/eacd7706f81843a384e7bd855c927f06 |
op_doi |
https://doi.org/10.3390/en14061763 |
container_title |
Energies |
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14 |
container_issue |
6 |
container_start_page |
1763 |
_version_ |
1766068874954932224 |