Integrating the Pillared-Layer Strategy and Pore-Space Partition Method to Construct Multicomponent MOFs for C₂H₂/CO₂...

Area of Science:

• Materials Science
• Chemistry

Background:

• Metal-organic frameworks (MOFs) offer tunable porosity for gas adsorption and separation.
• Increasing the diversity of MOFs through multicluster and multiligand (mm) incorporation is a key challenge.
• Pillared-layer and pore-space partition (PL-PSP) strategies can create complex MOF architectures.

Purpose of the Study:

• To synthesize and characterize a series of porous multicluster-multiligand metal-organic frameworks (mm-MOFs) using the PL-PSP strategy.
• To investigate the gas adsorption properties and separation capabilities of the newly developed MOFs.

Main Methods:

• Construction of mm-MOFs based on {Co3}-cluster sheets and {Co6}-cluster pillars.
• Synthesis of seven isoreticular mm-MOFs (FJU-6-X) by varying ligands and metal ions.
• Characterization of BET surface areas and gas adsorption capacities (CO2, C2H2).
• Gas separation experiments using fixed-bed breakthrough tests.

Main Results:

• A new (3,9,12)-connected topology was achieved in the FJU-6 MOF.
• Synthesized seven isoreticular mm-MOFs (FJU-6-X) with BET surface areas from 731 to 1306 m²/g.
• Achieved a 77% increase in CO2 adsorption capacity.
• Demonstrated effective separation of C2H2/CO2 mixtures using FJU-6-TATB at ambient temperature.

Conclusions:

• The integration of the pillared-layer strategy and pore-space partitioning is an effective method for constructing diverse mm-MOFs.
• The developed mm-MOFs exhibit optimized gas adsorption and separation performance.
• These findings open avenues for designing advanced MOFs for environmental applications.