Iron containing porous organic polymers (Fe-POPs) have been synthesized by a facile one-pot bottom-up approach to porphyrin chemistry by an extended aromatic substitution reaction between pyrrole and aromatic dialdehydes in the presence of small amount of Fe(III). The Fe-POPs possess very high BET surface area, large micropores and showed excellent CO₂ capture (∼19 wt%) at 273 K/1 bar.

Catalytic reduction of CO₂is very challenging from both economics and green chemistry perspectives. This critical review highlights major advancements made in the CO₂reduction processes and their future challenges.