Porous organic polymers (POPs) are emerging with a great promise for gas storage and separation applications. Due to their remarkable physicochemical stability, POPs are considered as excellent sorbents for CO2 capture and separation, wherein high temperatures and acidic gases are typically involved. Selective CO2 capture from gas mixtures can be achieved by tuning the chemical and physical properties of the pores of POPs. The synthesis and characterization of azo-linked polymers (ALPs) and their selective CO2 capture over CH4 and N2 will be presented. ALPs are prepared by a novel facile synthetic route by homocoupling of aniline-like monomers using copper(I) as a catalyst. ALPs have high BET surface area (up to 1235 m2g-1) and exhibit high stability in harsh acidic and basic conditions, and remain intact up to 400 � C. One of the polymers, ALP-1, has remarkable CO2 uptake capacity (5.37 mmol g-1, 1 bar/273 K) which competes with the best porous organic polymers for CO2 capture at ambient pressure. We have also correlated the performance of these polymers in CO2 uptake and separation to their textural properties such as surface area and pore size. Our findings suggest that the higher porosity levels in these polymers lead to higher CO2 uptake capacities. However, the CO2/N2 selectivity of this class of polymers is compromised by high porosity levels. We also studied the performance of our polymers for gas storage at high pressure settings and found that the CO2 uptake capacities of all ALPs are significant (up to 42 wt%, 40 bar/298 K).Reference: Arab, P.; Rabbani, M. G.; Sekizkardes, A. K.; Islamoglu, T.; El-Kaderi, H. M.*  �Copper(I)-Catalyzed Synthesis of Nanoporous Azo-Linked Polymers: Impact of Textural Properties on Gas Storage and Selective Carbon Dioxide Capture,� Mater. Chem. 2014  ,1385�1392 (featured on the cover of Chemistry of Materials, Issue 3,volume 26)

Nanoporous azo-linked polymers for selective carbon dioxide capture

248th National Meeting (2014)

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