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I1.05 - Polymeric Adsorbents for CO2 Capture with Tunable Ultra-Microporosity and Mesoporosity 
April 22, 2014   10:45am - 11:00am

Porous polymers are getting increasingly more studied as candidate adsorbents, membranes and parts in membrane composites for CO2 capture from flue gas or natural gas mixtures. As adsorbents they are relevant as both physisorbents and chemisorbents for CO2. As physisorbents targeting CO2 capture from flue gas it is crucial that the polymers have a significant amount of (ultra)micropores, which enable a high working capacity for CO2 removal. The ultramicropores leads to a high mass transport restriction and micro-/mesoporous organic polymers (MMOPs) could offer a way to lessen those. Three armed monomers of 1,3,5-tris(4-aminophenyl)benzene and 1,3,5-benzenetricarboxaldehyde were used to synthesize MMOPs by Schiff base condensation reactions. The fraction of micro- and mesopores in the MMOPs depended strongly on the amine/aldehyde ratio used. A mechanism based on oligomeric self-templating is proposed that rationalize the dependency on the amine/aldehyde ratio on the mesopores formation. The MMOPs had specific surface areas and pore volumes up to 694 m2/g and 0.67 cm3/g. They exhibited a high CO2 uptake (21~38 cm3/g at 0.15 bar and 49~76 cm3/g at 1 bar; 273 K), and the CO2-over-N2 selectivity was 31~90. The mesopores appeared to be of an “ink-bottle” type as revealed by cavitation on N2 desorption. The ultramicropores appeared to form by templating by either DMSO or by an excess of the aldehyde. The MMOPs could potentially be relevant for applications in carbon capture and storage (CCS), where the mesopores would facilitate a rapid mass transport. We will conclude with comparing the MMOPs with zeolites, metal organic frameworks and alike.

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