Selective CO 2 adsorption in a porphyrin polymer with benzimidazole linkages

A new nanoporous porphyrin-based benzimidazole linked polymer, PBILP, was synthesized. The use of porphyrin monomers as molecular building units led to the formation of a rigid amorphous network that has a moderate surface area ( S BET = 557 m 2 g −1 ). The CO 2 adsorption ability of PBILP is 12.1 wt% (2.76 mmol g −1 ) and it has a CO 2 /CH 4 selectivity of 7.2 at 273 K/1 bar and a CO 2 /N 2 selectivity of 72 at 273 K/1 bar.