In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates
Previous studies have indicated that CH4-CO2 hydrate replacement is closely related to the crystal dissociation and reformation processes. To further elucidate the replacement mechanism, the melting processes of mixed CH4-CO2 hydrates were characterized using in situ Raman spectroscopy and compared...
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/11124 2023-05-15T17:12:03+02:00 In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates Zhou, Xuebing Long, Zhen Liang, Shuai He, Yong Yi, Lizhi Li, Dongliang Liang, Deqing 2016-02-01 http://ir.giec.ac.cn/handle/344007/11124 https://doi.org/10.1021/acs.energyfuels.5b02119 英语 eng ENERGY & FUELS http://ir.giec.ac.cn/handle/344007/11124 doi:10.1021/acs.energyfuels.5b02119 Science & Technology Technology Energy & Fuels Engineering METHANE HYDRATE CLATHRATE HYDRATE SELF-PRESERVATION CH4 HYDRATE GAS HYDRATE SPECTROSCOPIC OBSERVATIONS PRESSURIZED CO2 LIQUID CO2 REPLACEMENT ICE Chemical Article 期刊论文 2016 ftchacadsciegiec https://doi.org/10.1021/acs.energyfuels.5b02119 2022-09-23T14:12:36Z Previous studies have indicated that CH4-CO2 hydrate replacement is closely related to the crystal dissociation and reformation processes. To further elucidate the replacement mechanism, the melting processes of mixed CH4-CO2 hydrates were characterized using in situ Raman spectroscopy and compared to that of pure CH4 and CO2 hydrates. Analysis results from powder X-ray diffraction showed that the crystalline structure of the mixed CH4-CO2 hydrates is strucutre I. The current study suggested that the hydrate crystal units collapse as an entity with no clear dependence upon gas distributions within the hydrate phase. The dissociation time was found to be stoichastic, consistent with the polycrystalline nature of the hydrate particles. Interestingly, for hydrates containing CH4, the Raman peaks of both CH4 and CO2 in the hydrate phase showed a temporary rise during the hydrate dissociation processes, suggesting the reformation of hydrates below the hydrate dissociation surface. A dissociation inside the hydrate crystal together with the self-preservation effect was assumed to be responsible for such a phenomenon. Article in Journal/Newspaper Methane hydrate Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR Energy & Fuels |
institution |
Open Polar |
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Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
Science & Technology Technology Energy & Fuels Engineering METHANE HYDRATE CLATHRATE HYDRATE SELF-PRESERVATION CH4 HYDRATE GAS HYDRATE SPECTROSCOPIC OBSERVATIONS PRESSURIZED CO2 LIQUID CO2 REPLACEMENT ICE Chemical |
spellingShingle |
Science & Technology Technology Energy & Fuels Engineering METHANE HYDRATE CLATHRATE HYDRATE SELF-PRESERVATION CH4 HYDRATE GAS HYDRATE SPECTROSCOPIC OBSERVATIONS PRESSURIZED CO2 LIQUID CO2 REPLACEMENT ICE Chemical Zhou, Xuebing Long, Zhen Liang, Shuai He, Yong Yi, Lizhi Li, Dongliang Liang, Deqing In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates |
topic_facet |
Science & Technology Technology Energy & Fuels Engineering METHANE HYDRATE CLATHRATE HYDRATE SELF-PRESERVATION CH4 HYDRATE GAS HYDRATE SPECTROSCOPIC OBSERVATIONS PRESSURIZED CO2 LIQUID CO2 REPLACEMENT ICE Chemical |
description |
Previous studies have indicated that CH4-CO2 hydrate replacement is closely related to the crystal dissociation and reformation processes. To further elucidate the replacement mechanism, the melting processes of mixed CH4-CO2 hydrates were characterized using in situ Raman spectroscopy and compared to that of pure CH4 and CO2 hydrates. Analysis results from powder X-ray diffraction showed that the crystalline structure of the mixed CH4-CO2 hydrates is strucutre I. The current study suggested that the hydrate crystal units collapse as an entity with no clear dependence upon gas distributions within the hydrate phase. The dissociation time was found to be stoichastic, consistent with the polycrystalline nature of the hydrate particles. Interestingly, for hydrates containing CH4, the Raman peaks of both CH4 and CO2 in the hydrate phase showed a temporary rise during the hydrate dissociation processes, suggesting the reformation of hydrates below the hydrate dissociation surface. A dissociation inside the hydrate crystal together with the self-preservation effect was assumed to be responsible for such a phenomenon. |
format |
Article in Journal/Newspaper |
author |
Zhou, Xuebing Long, Zhen Liang, Shuai He, Yong Yi, Lizhi Li, Dongliang Liang, Deqing |
author_facet |
Zhou, Xuebing Long, Zhen Liang, Shuai He, Yong Yi, Lizhi Li, Dongliang Liang, Deqing |
author_sort |
Zhou, Xuebing |
title |
In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates |
title_short |
In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates |
title_full |
In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates |
title_fullStr |
In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates |
title_full_unstemmed |
In Situ Raman Analysis on the Dissociation Behavior of Mixed CH4-CO2 Hydrates |
title_sort |
in situ raman analysis on the dissociation behavior of mixed ch4-co2 hydrates |
publishDate |
2016 |
url |
http://ir.giec.ac.cn/handle/344007/11124 https://doi.org/10.1021/acs.energyfuels.5b02119 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
ENERGY & FUELS http://ir.giec.ac.cn/handle/344007/11124 doi:10.1021/acs.energyfuels.5b02119 |
op_doi |
https://doi.org/10.1021/acs.energyfuels.5b02119 |
container_title |
Energy & Fuels |
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1766068798427758592 |