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Flexible amorphous metal-organic frameworks with π Lewis acidic pore surface for selective adsorptive separations
1Nanomaterial Laboratory for Catalysis and Advanced Separations, Department of Chemical Engineering, Northeastern University, 313 Snell Engineering Center, 360 Huntington Avenue, Boston, Massachusetts 02115-5000, USA. fonsecagarcia.j@northeastern.edu s.choi@northeastern.edu.
Dalton Transactions (Cambridge, England : 2003)
|February 5, 2021
Summary
New metal-organic frameworks (MOFs) offer efficient separation of light hydrocarbons and adsorption of volatile organic compounds. NEU-4 demonstrates exceptional benzene adsorption and selectivity, promising for petrochemical applications.
Area of Science:
- Materials Science
- Chemistry
- Chemical Engineering
Background:
- Selective separation of light hydrocarbons (LHs) and adsorption of volatile organic compounds (VOCs) are critical yet challenging industrial processes.
- Existing methods are often expensive and complex, necessitating the development of advanced adsorbent materials.
- Shape-selective adsorbents offer a cost-effective solution for these separation demands.
Purpose of the Study:
- To introduce novel porous, dynamic, and amorphous metal-organic frameworks (MOFs) for adsorption and separation applications.
- To investigate the properties of electron-deficient pore surfaces in MOFs for enhanced guest interactions.
- To evaluate the performance of these MOFs in adsorptive separations within the petrochemical industry.
Main Methods:
- Synthesis and characterization of four new MOFs: NEU-1c, NEU-2, NEU-3, and NEU-4.
- Design of MOFs with predesigned π-electron-deficient ligands to create electron-deficient pore surfaces.
- Utilizing MOF beds for adsorption and adsorptive separation experiments.
Main Results:
- NEU-3 and NEU-4, along with NEU-1c and NEU-2, exhibit electron-deficient pore surfaces due to their ligands.
- These MOFs function as smart guest-responsive materials with π Lewis acidic pore surfaces and framework flexibility.
- Effective adsorption and separation of various substances were achieved using beds of these MOFs.
- NEU-4 demonstrated ultrahigh benzene adsorption capacity, recognition, and selectivity over analogues, alongside high stability and regenerability.
Conclusions:
- The newly developed MOFs, particularly NEU-4, show significant potential for cost-effective and efficient separation of LHs and adsorption of VOCs.
- The electron-deficient pore surfaces and framework flexibility contribute to the unique adsorptive properties of these materials.
- NEU-4 is a promising candidate for industrial applications in the petrochemical sector due to its superior benzene adsorption and selectivity.
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