Selective CO2 adsorption in a porphyrin polymer with benzimidazole linkages

Abstract

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 m² g⁻¹). The CO₂ adsorption ability of PBILP is 12.1 wt% (2.76 mmol g⁻¹) and it has a CO₂/CH₄ selectivity of 7.2 at 273 K/1 bar and a CO₂/N₂ selectivity of 72 at 273 K/1 bar.