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Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates
Knowledge of carbon isotope fractionation is needed in order to discuss the formation and dissociation of naturally occurring CO(2) hydrates. We investigated carbon isotope fractionation during CO(2) hydrate formation and measured the three-phase equilibria of (12)CO(2)–H(2)O and (13)CO(2)–H(2)O sys...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8306263/ https://www.ncbi.nlm.nih.gov/pubmed/34299489 http://dx.doi.org/10.3390/molecules26144215 |
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author | Kimura, Hiromi Fuseya, Go Takeya, Satoshi Hachikubo, Akihiro |
author_facet | Kimura, Hiromi Fuseya, Go Takeya, Satoshi Hachikubo, Akihiro |
author_sort | Kimura, Hiromi |
collection | PubMed |
description | Knowledge of carbon isotope fractionation is needed in order to discuss the formation and dissociation of naturally occurring CO(2) hydrates. We investigated carbon isotope fractionation during CO(2) hydrate formation and measured the three-phase equilibria of (12)CO(2)–H(2)O and (13)CO(2)–H(2)O systems. From a crystal structure viewpoint, the difference in the Raman spectra of hydrate-bound (12)CO(2) and (13)CO(2) was revealed, although their unit cell size was similar. The δ(13)C of hydrate-bound CO(2) was lower than that of the residual CO(2) (1.0–1.5‰) in a formation temperature ranging between 226 K and 278 K. The results show that the small difference between equilibrium pressures of ~0.01 MPa in (12)CO(2) and (13)CO(2) hydrates causes carbon isotope fractionation of ~1‰. However, the difference between equilibrium pressures in the (12)CO(2)–H(2)O and (13)CO(2)–H(2)O systems was smaller than the standard uncertainties of measurement; more accurate pressure measurement is required for quantitative discussion. |
format | Online Article Text |
id | pubmed-8306263 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-83062632021-07-25 Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates Kimura, Hiromi Fuseya, Go Takeya, Satoshi Hachikubo, Akihiro Molecules Article Knowledge of carbon isotope fractionation is needed in order to discuss the formation and dissociation of naturally occurring CO(2) hydrates. We investigated carbon isotope fractionation during CO(2) hydrate formation and measured the three-phase equilibria of (12)CO(2)–H(2)O and (13)CO(2)–H(2)O systems. From a crystal structure viewpoint, the difference in the Raman spectra of hydrate-bound (12)CO(2) and (13)CO(2) was revealed, although their unit cell size was similar. The δ(13)C of hydrate-bound CO(2) was lower than that of the residual CO(2) (1.0–1.5‰) in a formation temperature ranging between 226 K and 278 K. The results show that the small difference between equilibrium pressures of ~0.01 MPa in (12)CO(2) and (13)CO(2) hydrates causes carbon isotope fractionation of ~1‰. However, the difference between equilibrium pressures in the (12)CO(2)–H(2)O and (13)CO(2)–H(2)O systems was smaller than the standard uncertainties of measurement; more accurate pressure measurement is required for quantitative discussion. MDPI 2021-07-11 /pmc/articles/PMC8306263/ /pubmed/34299489 http://dx.doi.org/10.3390/molecules26144215 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kimura, Hiromi Fuseya, Go Takeya, Satoshi Hachikubo, Akihiro Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates |
title | Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates |
title_full | Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates |
title_fullStr | Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates |
title_full_unstemmed | Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates |
title_short | Carbon Isotope Fractionation during the Formation of CO(2) Hydrate and Equilibrium Pressures of (12)CO(2) and (13)CO(2) Hydrates |
title_sort | carbon isotope fractionation during the formation of co(2) hydrate and equilibrium pressures of (12)co(2) and (13)co(2) hydrates |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8306263/ https://www.ncbi.nlm.nih.gov/pubmed/34299489 http://dx.doi.org/10.3390/molecules26144215 |
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