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Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
Published on: August 25, 2016
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High-Pressure Insertion of Dense H2 into a Model Zeolite
Wan Xu1,2, Xiao-Di Liu1, Miriam Peña-Alvarez3
1Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.
The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|September 26, 2022
Summary
Zeolites exhibit super-filling with hydrogen (H2) molecules under high pressure, forming a unique glassy-like state. This prevents zeolite amorphization up to 80 GPa, a record for zeolites and group IV elements.
Area of Science:
- Materials Science
- High-Pressure Physics
- Chemistry
Background:
- Zeolites are crystalline porous materials with diverse applications.
- Understanding hydrogen behavior under extreme pressure is crucial for energy storage and fundamental science.
- Previous studies on confined hydrogen in zeolites have been limited by pressure ranges.
Purpose of the Study:
- To investigate the behavior of hydrogen confined within a zeolite under extreme high pressures.
- To determine the maximum hydrogen occupancy and structural stability of zeolites under pressure.
- To characterize the phase and intermolecular interactions of confined hydrogen.
Main Methods:
- High-pressure synchrotron X-ray diffraction.
- Monte Carlo computational modeling.
- Raman spectroscopy.
Main Results:
- Observed super-filling of zeolite with hydrogen (H2), with nearly two molecules per framework unit, twice that in gas hydrates.
- Zeolite host material remained non-amorphized up to 80 GPa, a record pressure.
- Confined H2 formed an exotic, topologically constrained glassy-like phase.
- Microporosity of the zeolite was retained up to 80 GPa.
- Intermolecular interactions of confined H2 showed similarities to bulk hydrogen but were influenced by the zeolite framework.
Conclusions:
- Zeolites can accommodate significantly higher hydrogen densities than previously thought under extreme pressure.
- Super-filling of zeolites with hydrogen enhances structural stability, preventing amorphization at record pressures.
- Confinement within zeolites induces unique phases and modifies intermolecular interactions of hydrogen.
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