Experimental synthesis reveals the stable hexagonal HS-I clathrate hydrate using an asymmetric quaternary ammonium salt, highlighting potential for high-capacity carbon capture and gas storage.
The three Frank-Kasper basic structures of clathrate hydrates have long been theoretically defined, yet the hexagonal form HS-I had remained experimentally elusive for over 70 years. Using a purpose-designed asymmetric quaternary ammonium salt（N4446Cl）, we achieved the first stable synthesis of HS-I, confirmed by single-crystal X-ray diffraction. HS-I shows high CH4 and CO2 storage capacity, offering promise for carbon capture applications.
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Sanehiro Muromachi (2026) studied this question.
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