Hydrogen-bonded clathrate hydrate as tunable media for efficient methane storage. Issue 5 (October 2022)

• Record Type: Journal Article
• Authors: Lee, Yunseok; Moon, Seokyoon; Seo, Dongju; Lee, Seungin; Park, Youngjune
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 5(2022)
• Publication Date: 2022-10
• Subjects: Gas hydrate -- Tuning effect -- Natural gas storage -- Host-guest interaction; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108473
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The tuning effect of gas hydrates, which creates additional nanospaces to accommodate gaseous guest while maintaining favorable formation conditions, is recognized as a promising strategy for energy gas (CH4 or H2 ) storage. Although the tuning behavior has been demonstrated on sI and sII gas hydrates, it has not been studied in sH hydrates which have the largest potential gas storage capacity. Here, we report the sH tuning behavior in 1-Methylpiperidine + CH4 hydrate systems under mild formation conditions (e.g., 263.15 K, and 8.0 MPa). The occurrence of sH tuning behavior is experimentally verified via 13 C solid-state NMR with DFT calculations. The tuning patterns are observed below the eutectic composition of water + 1-Methylpiperidine, which strongly suggests that the supercooled aqueous phase existing on the surface of ice particles plays a significant role in the tuning phenomena. We expect these finding can open new strategies for enhancing capacity for gas storage, and provide critical insights into the fundamental nature of clathrate chemistry. Graphical Abstract: ga1 Highlights: The sH tuning effect was experimentally observed in the mild formation condition. A unique pattern of sH tuning effect with relatively higher CGC was observed. The supercooled aqueous phase plays a significant role in the tuning phenomena. DFT calculations support the single CH4 molecule was trapped in large cavities.