Building multiple adsorption sites in porous polymer networks for carbon capture applications

IAST calculations reveal that sulfonate ammonium salt grafting renders porous polymer networks (PPN-6-SO3NH4) with exceptionally high adsorption selectivity for CO2 over N2 and CO2 over CH4. Breakthrough experiments confirm the high CO2 adsorption capacity (1.7 mmol g−1, 75 mg g−1) by feeding 15% CO2 balanced with N2 at 295 K and 1 bar.