Hydrogen and carbon dioxide capture by phenazine-integrated porous organic polymers

Porous organic polymers (POPs) are becoming more and more acknowledged as potential materials for hydrogen storage and CO₂ capture because of their remarkable structural features, including large surface areas, thermal stability, and adaptable functions. The current study included the synthesis and thorough characterization of three unique POPs, which were designated as RQ1, RQ2, and RQ3. To maximize hydrogen and CO₂ adsorption capabilities, each polymer combines unique structural motifs based on phenazine monomers. A Friedel-Crafts alkylation process was used to produce the polymers, and their synthesis was validated using NMR and FTIR. At 77 K and 760 mmHg, RQ3, which has a rigid three-dimensional structure, achieved a maximum hydrogen adsorption of 2.81 wt% and displayed a Brunauer-Emmett-Teller (BET) surface area of 1727 m2/g. Furthermore, at 273K, RQ3 exhibited the highest CO₂ adsorption (2.33 mmol/g) and CO₂/N₂ IAST selectivity (197). These results highlight the possibility of customized porous organic structures for efficient hydrogen storage and CO₂, which might lead to the development of new materials for renewable energy uses.