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Hongcai Zhou1 Gregory Day1

1, Texas A&M University, College Station, Texas, United States

Power plant fossil fuel combustion is a major source of anthropogenic CO2 emissions, and as such, much current research has focused on mitigating these CO2 emissions. As part of our continued research into porous materials we have begun investigating a series of porous polymer network (PPN) sorbents for post-combustion carbon capture. Our leading sorbent series, the PPN-150 series, are mesoporous melamine-formaldehyde resins which, upon loading with amines, can act as highly efficient sorbents for CO2 capture under flue gas conditions. The high nitrogen content of the parent polymer greatly improves the amine tethering ability of the material compared to porous carbon while still not requiring the extensive synthesis seen in amine functionalized sorbents. The tethering ability can also be tuned by adding in dopants, functionalized small molecules that are dispersed throughout the polymer structure and provide separate sites for amine tethering or CO2 chemisorption. By adjusting the loaded amines and dopants identities the sorbents are capable of CO2 uptakes greater than 0.1 g/g sorbent. In addition, cycling studies have been performed with these sorbents showing loss of CO2 uptakes less than 4.5% over 33 cycles under dry gas conditions, with no noticeable loss in cycling performance observed for wet gas cycling. The PPN-150 series can be produced at the bench scale, taking advantage of the low-cost reagents required for the synthesis, while still maintaining high gravimetric CO2 uptakes.

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