Assembly via 1,4-benzenedicarboxylate linker and Zn2+ ions afforded a new MOF containing novel [Zn4F4] cubane cores, showing excellent C2H2 separation from C2H2–CO2 and C2H2–CH4 mixtures.
Herein,
we used the 4-fluoro-[1,1′-biphenyl]-3,4′,5-tricarboxylic
acid (H3fbptc) ligand to design and construct a new metal–organic
framework (MOF), [Cu3(fbptc)2(H2O)3]·3NMP (1), which possesses rich accessible
metal sites and F functional groups in the porous walls and shows
high uptake for C2H2 (119.3 cm3 g–1) and significant adsorption selectivity for C2H2 over CH4 (14.4) and CO2 (3.6) at 298 K and 100 kPa. In particular, for the gas mixtures
of C2H2–CH4 and C2H2–CO2, the MOF reveals large breakthrough
time ratios (C2H2/CH4 = 13, C2H2/CO2 = 5.9), which are particularly
prominent in dynamic breakthrough experiments, also confirming the
excellent potential for the practical separation of C2H2 from two-component mixtures (C2H2–CH4 and C2H2–CO2) and
even three-component mixtures (C2H2–CO2–CH4).
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