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Reduction of Alkenes: Catalytic Hydrogenation

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Hydrogen Production and Utilization in a Membrane Reactor

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Published on: March 10, 2023

Multivariate Flexible Framework with High Usable Hydrogen Capacity in a Reduced Pressure Swing Process.

Arijit Halder¹, Ryan A Klein^2,3, Sarah Shulda²

¹Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States.

Journal of the American Chemical Society

|March 30, 2023

Summary

Flexible metal-organic frameworks show step-shaped gas adsorption for efficient hydrogen storage. A new multivariate approach lowers pressure requirements, enabling practical delivery of hydrogen fuel.

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Area of Science:

Materials Science
Chemistry
Chemical Engineering

Background:

Flexible metal-organic frameworks (MOFs) offer step-shaped adsorption-desorption, ideal for gas storage and delivery.
Current MOFs for hydrogen (H$_{2}$) storage require high pressures or large temperature swings due to weak physisorption.
Designing new flexible MOFs is challenging; adapting existing frameworks is a more feasible strategy.

Purpose of the Study:

To demonstrate the multivariate linker approach for tuning the phase-change behavior of flexible MOFs.
To adapt the CdIF-13 framework for improved hydrogen adsorption-desorption properties.
To enable efficient storage and delivery of weakly physisorbing gases like H$_{2}$.

Main Methods:

Solvothermal incorporation of 2-methyl-5,6-difluorobenzimidazolate into the CdIF-13 framework.
Creation of a multivariate framework: sod-Cd(benzimidazolate)$_{1.87}$(2-methyl-5,6-difluorobenzimidazolate)$_{0.13}$ (ratio 14:1).
Measurement of H$_{2}$ adsorption-desorption isotherms at 77 K and 87 K.

Main Results:

The multivariate MOF exhibited a reduced stepped adsorption threshold pressure compared to the parent framework.
At 77 K, H$_{2}$ saturation occurred below 50 bar with minimal desorption hysteresis at 5 bar.
At 87 K, saturation was achieved by 90 bar, with hysteresis closing at 30 bar, enabling usable capacities >1 mass %.

Conclusions:

The multivariate linker approach is effective for tuning MOF flexibility and adsorption behavior.
The modified CdIF-13 framework demonstrates efficient H$_{2}$ storage and delivery under mild conditions.
This strategy facilitates the adaptation of existing flexible MOFs for practical applications in gas storage.