Knitting polycyclic aromatic hydrocarbon-based microporous organic polymers for efficient CO₂ capture

Abstract

In order to achieve efficient CO2 capture, four novel microporous organic polymers, based on distinct polycyclic aromatic hydrocarbons, were successfully prepared by the solvent knitting method.

Post-synthetic fluorination of Scholl-coupled microporous polymers for increased CO2 uptake and selectivity

“…The data supported polymer formation and matched the analysis for the previously reported polymers. 23,24 We also evaluated the porosity of the materials (SA BET and pore volume) using nitrogen adsorption-desorption isotherms at 77.3 K, in addition to collecting CO 2 , CH 4 , and N 2 isotherms at 298 K for N 2 , 273 and 298 K for CH 4 and 298, 318, or 328 K for CO 2 . Despite the reasonably high CO 2 capacities for these polymers (2-3 mmol g À1 ) at 298 K and 1 bar, their lack of functionality imparts low isosteric heats at the zero-coverage region (24-27 kJ mol À1 ) and low CO 2 /N 2 selectivities.…”

“…Scholl-coupling of the monomers was carried out using previously reported literature procedures (Scheme 1). 23,24 In total, seven Scholl-coupled polymers derived from 1,3,5-triphenylbenzene, triptycene, biphenyl, 1,1 0 -binaphthyl, uoranthene, naphthalene, and triphenylene were studied. FT-IR of all the Scholl-coupled polymers shows C]C vibrational stretches in the region of 1500-1600 cm À1 .…”

“…The 13 C SS-NMRs for SC-naphthalene and SC-uoranthene are consistent with the literature. 24 The additional carbon peaks below 40 ppm-observed for all the polymers-correspond to the methylene bridges, which are formed as a consequence of using DCM as a reaction solvent (Fig. S9, ESI †).…”

“…S9, ESI †). 23,24 The discrepancies between the measured and calculated CH analysis of the Scholl-coupled polymers (Table S1, ESI †) is likely due to adsorption of atmospheric moisture, incorporation of methylene bridges into the polymer, or entrapped Al salts.…”

“…[19][20][21] Since cost, scalability, and stability are important factors for the commercial application of porous adsorbents for carbon capture applications, we opted to focus on HCPs, and in particular a sub-class of Scholl-coupled HCPs. [22][23][24] Scholl-coupled polymers meet several of the necessary criteria for post-combustion CO 2 capture from ue gas such as moderate cost, availability of starting materials, scalability, and physicochemical stability. They can also possess good levels of porosity.…”