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International Conference on Gas Hydrates (ICGH) (6th : 2008)

NMR studies on CH4 + CO2 binary gas hydrates dissociation behavior Rovetto, Laura J.; Dec, Steven F.; Koh, Carolyn A.; Sloan, E. Dendy

Abstract

The dissociation behavior of the CH4+CO2 binary gas hydrate has been investigated using Nuclear Magnetic Resonance (NMR) spectroscopy. This technique allows us to distinguish the hydrate structure present, as well as to quantify phase concentrations. Single-pulse excitation was used in combination with magic-angle spinning (MAS). Time-resolved in situ decomposition experiments were carried out at different compositions in sealed, pressurized samples. The decomposition profiles of the CH4+CO2 binary gas hydrate system obtained at various compositions suggest that the decomposition rate is a strong function of the fractional cage occupancy and temperature. An unexpected CH4 hydrate reformation was observed during our decomposition experiments when the temperature reached the ice melting point. A decrease on the CO2 content in the hydrate phase was found during the decomposition experiment, as the pressure and temperature of the system increases.

Item Metadata

Title
NMR studies on CH4 + CO2 binary gas hydrates dissociation behavior
Creator
Rovetto, Laura J.; Dec, Steven F.; Koh, Carolyn A.; Sloan, E. Dendy
Contributor
University of British Columbia. Department of Chemical and Biological Engineering; International Conference on Gas Hydrates (6th : 2008 : Vancouver, B.C.)
Date Issued
2008-07
Description
The dissociation behavior of the CH4+CO2 binary gas hydrate has been investigated using Nuclear Magnetic Resonance (NMR) spectroscopy. This technique allows us to distinguish the hydrate structure present, as well as to quantify phase concentrations. Single-pulse excitation was used in combination with magic-angle spinning (MAS). Time-resolved in situ decomposition experiments were carried out at different compositions in sealed, pressurized samples. The decomposition profiles of the CH4+CO2 binary gas hydrate system obtained at various compositions suggest that the decomposition rate is a strong function of the fractional cage occupancy and temperature. An unexpected CH4 hydrate reformation was observed during our decomposition experiments when the temperature reached the ice melting point. A decrease on the CO2 content in the hydrate phase was found during the decomposition experiment, as the pressure and temperature of the system increases.
Extent
205886 bytes
Subject
Methane; Carbon dioxide; Decomposition; NRM
Genre
Conference Paper
Type
Text
File Format
application/pdf
Language
eng
Date Available
2016-11-21
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0041032
URI
http://hdl.handle.net/2429/1143
Affiliation
Non UBC
Citation
Rovetto, Laura J.; Dec, Steven F.; Koh, Carolyn A.; Sloan, E. Dendy. 2008. NMR studies on CH4 + CO2 binary gas hydrates dissociation behavior. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
Peer Review Status
Unreviewed
Copyright Holder
Sloan, E. Dendy; Koh, Carolyn A.; Dec, Steven F.
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribution-NonCommercial-NoDerivatives 4.0 International