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ZIF-8 Pellets as a Robust Material for Hydrogen Cryo-Adsorption Tanks.

Rafael Balderas-Xicohtencatl¹, Jose A Villajos², Jose Casabán³

¹Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569Stuttgart, Germany.

ACS Applied Energy Materials

|September 29, 2023

Summary

Zeolitic imidazolate frameworks (ZIFs) offer efficient hydrogen storage. Pelletized ZIF-8 demonstrates high volumetric capacity and stability for practical hydrogen storage applications.

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Area of Science:

Materials Science
Chemical Engineering
Energy Storage

Background:

Cryoadsorption in porous materials is a key strategy for hydrogen storage.
Zeolitic imidazolate frameworks (ZIFs) are stable, porous materials suitable for this application.

Purpose of the Study:

To evaluate the hydrogen storage capacity of ZIF-8 synthesized via mechanochemical twin-screw extrusion.
To assess the impact of pelletization on ZIF-8's volumetric hydrogen storage.

Main Methods:

Mechanochemical synthesis of ZIF-8 powder and pellets using twin-screw extrusion.
Hydrogen storage capacity measurements at 77 K and up to 100 bar across multiple labs and setups.
Cycling experiments to evaluate material stability.

Main Results:

Pelletizing ZIF-8 enhanced packing density without porosity loss, improving volumetric storage.
High reproducibility in hydrogen uptake measurements was confirmed.
A temperature-pressure swing adsorption process yielded approximately 31 g of usable hydrogen per liter of pellet.
No degradation in storage capacity was observed after cycling experiments.

Conclusions:

ZIF-8 pellets exhibit excellent stability and high volumetric hydrogen storage capacity.
Mechanochemically synthesized and pelletized ZIF-8 is a promising material for technical hydrogen storage applications.
The material's robustness supports its use in pilot- and full-scale adsorption vessels.