Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received November 6, 2024
Revised December 17, 2024
Accepted January 1, 2025
Available online October 25, 2025
-
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
All issues
Structure-H Type Hydrates Containing Cyclooctane-Based Epoxy (Oxirane) Compounds
https://doi.org/10.1007/s11814-025-00380-w
Abstract
Recently, various epoxy (oxirane) compounds have been identifi ed as novel methane hydrate formers, and their hydrates’
structural and thermodynamic properties have been studied. However, most epoxy compounds reported, thus far, are relatively
small molecules that form structure-II (sII) hydrates. This study demonstrates that two epoxy compounds, 1,2-epoxycyclooctane
and 1,2,5,6-diepoxycyclooctane, which have cyclooctane backbones with one and two epoxy groups, respectively, can
form structure-H (sH) hydrates with CH 4 help gas and serve as thermodynamic promoters of CH 4 hydrates. Crystallographic,
spectroscopic, and phase equilibrium analyses indicate that the epoxy group of LGM has minimal eff ect on the composition
of CH 4 hydrates (i.e., CH 4 storage) but signifi cantly infl uences equilibrium conditions. The moderate hydrophilicity induced
by the epoxy group signifi cantly enhances the thermodynamic stability of the CH 4 hydrates. These fi ndings suggest that
epoxy compounds have potential as thermodynamic promoters in various hydrate-based technologies.
