Natural gas plays a crucial role in daily and industrial production, but the impurities contained in natural gas limit its further use. It is very important to develop adsorbents that can separate CH from multicomponent mixtures, but there are still many challenges and problems. Herein, a novel porous MOF {[Mn(pbdia)(CO)(HO)] ↔ 5HO ↔ 2DMF} (pbdia = 2,2'-(5-carboxy-1,3-phenylene)bis(oxy) diterephthalic acid) was successfully synthesized based on a flexible pentacarboxylic acid ligand and a unique pentanuclear Mn(COO)CO cluster. The MOF reveals a 3D porous structure with 2D intersecting channels, which shows high CH, CH, and CO adsorption capacities and affinities over CH. Moreover, the ideal adsorption solution theory selectivities of CH/CH, CH/CH, and CO/CH can reach 263.0, 27.0, and 7.7, respectively, suggesting a potential for removing the low content of CH, CH, and CO from pipeline natural gas, which was further confirmed by breakthrough curves and GCMC simulations.
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