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Determining Surface Areas and Pore Volumes of Metal-Organic Frameworks

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Published on: March 8, 2024

Unusual adsorption behavior on metal-organic frameworks.

David Fairen-Jimenez¹, Nigel A Seaton, Tina Düren

¹Institute for Materials and Processes, School of Engineering, The University of Edinburgh, Edinburgh, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 28, 2010

Summary

Metal-organic frameworks (MOFs) exhibit unique Type V adsorption isotherms due to linker length influencing fluid interactions. This behavior offers novel possibilities for designing MOF adsorbents for gas storage and separation.

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Area of Science:

Materials Science
Chemical Engineering
Physical Chemistry

Background:

Microporous materials like zeolites and activated carbons exhibit well-defined adsorption behaviors.
Metal-organic frameworks (MOFs) present unique adsorption characteristics not typically observed in other materials.
Understanding these unique behaviors is crucial for advancing gas separation and storage technologies.

Purpose of the Study:

To investigate the occurrence of unusual Type V adsorption isotherms in a series of IRMOF family metal-organic frameworks.
To elucidate the relationship between linker length, pore size, and adsorption behavior in MOFs.
To explore the potential of MOFs with Type V adsorption for practical applications.

Main Methods:

Grand canonical Monte Carlo (GCMC) simulations were employed to model adsorption processes.
A series of isoreticular metal-organic frameworks (IRMOFs) with varying linker lengths were studied.
Adsorption isotherms were analyzed to identify and characterize Type V behavior.

Main Results:

The study confirmed the presence of Type V adsorption isotherms in specific IRMOF structures.
The occurrence of Type V behavior was found to be dependent on a delicate balance between fluid-fluid and fluid-solid interactions.
Linker length and resulting pore size were identified as critical factors governing this adsorption behavior.
A transition from Type V to Type I adsorption was observed with increasing temperature, influenced by linker length.

Conclusions:

The linker length in MOFs significantly impacts pore size and the balance of intermolecular forces, leading to unique Type V adsorption.
Increasing temperature can induce a transition from Type V to Type I adsorption, with the transition temperature and diffuseness dependent on linker length.
The identified Type V adsorption behavior in MOFs presents promising opportunities for the rational design of advanced adsorbents for gas separation and storage.