LAUSR

Abstract Microporous organic polymers (MOPs) are considered as one of the best candidates for CO2 adsorption and removal. In this work, the authors have synthesized two microporous hyper crosslinked polymers PCP-1 and PCP-2 from a novel 3D extended propeller-shaped monomer, tetraphenylcyclopentadienone (tetracyclone). Amine groups were grafted onto these polymers by post-synthetic modification of the ketone group to produce PCP-1A and PCP-2A. All the polymers were well characterized using various spectroscopic techniques. The microporous polymer PCP-1 has a high surface area (SA BET = 762 m2/g) and it got reduced to 490 m2/g in PCP-1A upon post-synthetic amine modification. But at the same time, carbon dioxide uptake gets enhanced from 7.74 wt% in PCP-1 to 10.38 wt% in PCP-1A at 273 K. Selectivity of CO2 adsorption over N2 is also found to be almost doubled upon post-synthetic amine modification. The heat of adsorption 38 kJ/mol, which is excellent for physisorption material, was obtained for PCP-1A towards CO2 capture. Hence it is envisaged as an energy-efficient alternative candidate to CO2 chemisorbents like liquid amine scrubbers.