Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 125, Issue 13, Pages 7511-7517Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c02177
Keywords
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Funding
- Chinese Academy of Sciences President's International Fellowship Initiative Fund [2019VMA0027]
- National Natural Science Foundation of China [11874361, 51672279, 11774354, 51727806]
- CAS Innovation Grant [CXJJ-19-B08]
- Science Challenge Project [TZ2016001]
- CASHIPS Director's Fund [YZJJ201705]
- Italian Ministry of Education, Universities and Research, MIUR [2015HK93L7]
- European Research Council (ERC) Grant Hecate [695527]
- Rhone-Alpes region [CPER07 13 CIRA]
- Equip@Meso project of the programme Investissements d'Avenir [ANR-10-EQPX-29-01]
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The study reveals that zeolite can accommodate a high concentration of H-2 molecules under high pressure, forming a unique glassy-like structure that is unattainable in pure hydrogen. Raman spectroscopy shows that the microporosity of the zeolite remains intact under high pressure, with intermolecular interactions influenced by the zeolite framework.
Our combined high-pressure synchrotron X-ray diffraction and Monte Carlo modeling studies show super-filling of the zeolite, and computational results suggest an occupancy by a maximum of nearly two inserted H-2 molecules per framework unit, which is about twice that observed in gas hydrates. Super-filling prevents amorphization of the host material up to at least 60 GPa, which is a record pressure for zeolites and also for any group IV element being in full 4-fold coordination, except for carbon. We find that the inserted H-2 forms an exotic topologically constrained glassy-like form, otherwise unattainable in pure hydrogen. Raman spectroscopy on confined H-2 shows that the microporosity of the zeolite is retained over the entire investigated pressure range (up to 80 GPa) and that intermolecular interactions share common aspects with bulk hydrogen, while they are also affected by the zeolite framework.
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