MOF-808(Zr) Metal Organic Frameworks (MOFs) Powder for Gas Absorption and Separation, CGASMOF808Zr

MOF-808 (Zr6O4(OH)4(BTC)2(HCOO)6, where BTC = benzene-1,3,5-tricarboxylate) is a high-connectivity zirconium-based framework featuring an spn topology. Unlike 12-connected UiO-66, MOF-808 features 6-connected Zr6 clusters linked by tritopic trimesate ligands, leaving six remaining coordination sites occupied by labile formate or hydroxyl/water ligands.

For Gas Absorption & Separation, the key structural features of the MOF-808 are: (1) Large Dual-Pore Architecture: The nucleophilic lone pair on the uncoordinated -NH2 nitrogen forms moderate dipole-quadrupole and local hydrogen-bonding interactions with the electrophilic carbon of CO2. This increases low-pressure (< 0.15 bar) CO2 uptake capacity and sharply elevates Ideal Adsorbed Solution Theory (IAST) selectivity over non-polar CH4 and N2. (2) Steric Size-Selective Sieving: The protruding amino groups constrict the effective triangular window diameter to ~ 4.5 Å, facilitating kinetic discrimination for smaller gas molecules (H2, CO2) over bulkier hydrocarbons (C2H6, C3H8). (3) Mixed-Matrix Membranes (MMMs): Pendant-NH2 moieties form strong hydrogen bonds and covalent links with polyimide and polysulfone matrices (e.g., Matrimid, 6FDA-DAM, Pebax), eliminating non-selective interface voids and sieve-in-a-cage defects.

References:

1. M. Najafi, et al., Appraising separation performance of MOF-808-based adsorbents for light olefins and paraffins, Microporous and Mesoporous Materials, 2024, 367, 112961
2. J. Wang, et al., Application of MOF-808 and its derivatives in carbon capture and CO2 catalytic conversion, J. Mater. Chem. A (2025) 13 (16): 11185–11209.