Porphyrinic Porous Aromatic Frameworks for Carbon Dioxide Adsorption and Separation

The capture of carbon dioxide (CO₂ ) from industrial process emissions is increasingly important for the mitigation and prevention of the disruptive effects of global warming. In this study, PAF (porous aromatic frameworks)-TPB(1,3,5-triphenylbenzene) and three-dimensional PAF-TPM (tetraphenylmethane) porphyrin-based aromatic porous materials were synthesized through the Scholl reaction. The CO₂ and N₂ adsorption isotherms at 273 K and 298 K were studied to determine the performance in carbon dioxide capture at flue gas conditions. There is a significant difference in the adsorption capacity of the two materials for CO₂ and N₂ , so they can be used for CO₂ /N₂ adsorption separation. PAF-TPM has better CO₂ /N₂ separation at low pressure (150 mbar), while PAF-TPB has the advantage of greater CO₂ /N₂ separation at high pressure (1 bar). It can be applied to CO₂ adsorption separation at low and high pressure, respectively. In particular, PAF-TPB has a CO₂ /N₂ separation efficiency of up to 100.9 at 1 bar and 273 K. This work provides ideas for the design and synthesis of organic porous materials for the adsorption separation of CO₂ and N₂ .