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Updated: Jun 23, 2025
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Methane Hydrate Crystallization on Sessile Water Droplets
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Reversible Phase Transformations in a Double-Walled Diamondoid Coordination Network with a Stepped Isotherm for
Xia Li1, Debobroto Sensharma1, Leigh Loots2
1Department of Chemical Science, Bernal Institute, University of Limerick, Limerick V94 T9PX, Republic of Ireland.
Journal of the American Chemical Society
|June 21, 2024
Summary
Researchers developed a new flexible metal-organic material (FMOM) called X-dia-6-Ni for adsorbed natural gas (ANG) storage. This material shows high methane uptake and working capacity, making it promising for efficient ANG storage applications.
Area of Science:
- Materials Science
- Chemistry
- Chemical Engineering
Background:
- Flexible metal-organic materials (FMOMs) with stepped isotherms are promising for enhanced working capacity in adsorbed natural gas (ANG) storage.
- However, few of the over 1000 known FMOMs achieve the methane uptake (>150 cm³/cm³) required for practical ANG storage at relevant conditions (65 atm, 298 K).
Purpose of the Study:
- To synthesize and characterize a novel FMOM with high methane storage capacity.
- To investigate the structural transformations and gas sorption properties of the new material for potential ANG applications.
Main Methods:
- Synthesis of a novel azo linker ligand (L) and its use to create the double-walled, interpenetrated diamondoid network X-dia-6-Ni.
- Characterization using single-crystal X-ray diffraction (SCXRD) and variable temperature/pressure powder X-ray diffraction (XRD).
- Gas sorption measurements (N₂, CO₂, CH₄) at low temperatures and high pressures.
Main Results:
- X-dia-6-Ni exhibits reversible structural transformations between narrow-pore (β) and large-pore (γ) phases induced by gas or liquid adsorption.
- The material displays stepped Type F-II isotherms for N₂ and CO₂ with high saturation uptakes (422 cm³/g and 401 cm³/g, respectively).
- X-dia-6-Ni achieves significant methane uptake (200 cm³/cm³ at 65 atm, 298 K) and a high working capacity (166 cm³/cm³ between 5-65 bar, 298 K), ranking among the best FMOMs, especially those with Type F-II isotherms.
Conclusions:
- The novel FMOM, X-dia-6-Ni, demonstrates exceptional methane storage capabilities due to its unique structure and reversible transformations.
- Its high working capacity and Type F-II isotherm make it a leading candidate for efficient adsorbed natural gas storage systems.
- The study highlights the potential of designing FMOMs with specific structural dynamics for optimized gas storage applications.
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