One new Co-MOF with F sites in the pores for selective C<sub>2</sub>H<sub>2</sub> adsorption over CO<sub>2</sub> and CH<sub>4</sub>
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Acetylene (C<sub>2</sub>H<sub>2</sub>) is a commonly utilized raw material in chemical industry, and the separation of C<sub>2</sub>H<sub>2</sub> is of great significance. Metal-organic frameworks (MOFs) have garnered extensive attention in the field of gas adsorption and separation. Herein, we fabricated one new Co-MOF, {[Co<sub>4</sub>(F-PyIP)<sub>4</sub>(DMF)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>]·2DMF}<sub>n</sub> (<b>1</b>), through using a F-functionalized ligand 2-fluorine-5-(4-pyridyl)isophthalic acid (H<sub>2</sub>F-PyIP). The MOF forms a 3,6-connected three-dimensional anatase topological framework and contains the square channels, in which the F functional groups enhance the adsorption for C<sub>2</sub>H<sub>2</sub> over CH<sub>4</sub> and CO<sub>2</sub>, leading to higher isosteric heat of adsorption for C<sub>2</sub>H<sub>2</sub> than CO<sub>2</sub> and CH<sub>4</sub> as well as significant adsorption selectivity for C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> (2.1) and C<sub>2</sub>H<sub>2</sub>/CH<sub>4</sub> (15.2) binary mixed gases at 298 K under 100 kPa. One novel Co-MOF material featuring F sites in the pores was synthesized through using the F-functionalized organic ligand. The presence of the F functional groups enables the MOF to exhibit significant adsorption selectivity towards C<sub>2</sub>H<sub>2</sub>-CO<sub>2</sub> and C<sub>2</sub>H<sub>2</sub>-CH<sub>4</sub> binary mixtures.
