There are no files associated with this item.
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.citation.startPage | 124434 | - |
dc.citation.title | CHEMICAL ENGINEERING JOURNAL | - |
dc.citation.volume | 389 | - |
dc.contributor.author | Mok, Junghoon | - |
dc.contributor.author | Choi, Wonjung | - |
dc.contributor.author | Seo, Yongwon | - |
dc.date.accessioned | 2023-12-21T17:36:59Z | - |
dc.date.available | 2023-12-21T17:36:59Z | - |
dc.date.created | 2020-04-02 | - |
dc.date.issued | 2020-06 | - |
dc.description.abstract | CH4-CO2 replacement in naturally occurring gas hydrates has been considered a promising method for both energy recovery and CO2 sequestration. In this study, the time-dependent guest exchange behaviors and guest distributions during CH4 -CO2 replacement were closely examined at two different CO2 injecting pressures (2.2 and 3.5 MPa) using nuclear magnetic resonance (NMR), in-situ Raman spectroscopy, powder X-ray diffraction (PXRD), and gas chromatography. The C-13 NMR spectra confirmed that the cage occupancy ratio of the CH4 molecules in the large 5(12)6(2) and small 5(12) cages (theta(L)/theta(S,CH4)) after the replacement was significantly smaller than that before the replacement because of the preferential occupation of CO2 in the large 5(12)6(2) cages. The time-dependent Raman spectra revealed that the rate of CO2 inclusion and the resultant CH4 depletion in the hydrate phase during the replacement was faster at a higher CO2 injecting pressure. The Rietveld refinement of the PXRD patterns offered a quantitative cage occupancy of CH4 and CO2 molecules before and after the replacement. The time-dependent cage occupancy values of CH4 and CO2 during the replacement obtained from a mull-methodological approach, which is a combination of PXRD analysis and in-situ Raman measurement, demonstrated that a significant guest exchange in the large 5(12)6(2) cages had a greater effect on the extent of replacement and that the kinetics of the CH4-CO2 replacement was accelerated at a higher CO2 injecting pressure. The results provide a better understanding of the kinetics and mechanism of the cage-specific CH4-CO2 replacement occurring in the sI hydrates for CH4 recovery and CO2 sequestration. | - |
dc.identifier.bibliographicCitation | CHEMICAL ENGINEERING JOURNAL, v.389, pp.124434 | - |
dc.identifier.doi | 10.1016/j.cej.2020.124434 | - |
dc.identifier.issn | 1385-8947 | - |
dc.identifier.scopusid | 2-s2.0-85079524483 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/31872 | - |
dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S1385894720304253?via%3Dihub | - |
dc.identifier.wosid | 000519528800140 | - |
dc.language | 영어 | - |
dc.publisher | ELSEVIER SCIENCE SA | - |
dc.title | Time-dependent observation of a cage-specific guest exchange in sI hydrates for CH4 recovery and CO2 sequestration | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental; Engineering, Chemical | - |
dc.relation.journalResearchArea | Engineering | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | Natural gas hydrate | - |
dc.subject.keywordAuthor | Replacement | - |
dc.subject.keywordAuthor | CO2 sequestration | - |
dc.subject.keywordAuthor | Guest exchange | - |
dc.subject.keywordAuthor | Kinetics | - |
dc.subject.keywordPlus | NATURAL-GAS HYDRATE | - |
dc.subject.keywordPlus | CARBON-DIOXIDE | - |
dc.subject.keywordPlus | DISSOCIATION BEHAVIOR | - |
dc.subject.keywordPlus | FLUE-GAS | - |
dc.subject.keywordPlus | REPLACEMENT | - |
dc.subject.keywordPlus | CAPTURE | - |
dc.subject.keywordPlus | MIXTURE | - |
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Tel : 052-217-1404 / Email : scholarworks@unist.ac.kr
Copyright (c) 2023 by UNIST LIBRARY. All rights reserved.
ScholarWorks@UNIST was established as an OAK Project for the National Library of Korea.