PolyHIPE-derived amine–porphyrin monoliths for mild cycloaddition of low-concentration CO2

Abstract

A monolithic catalyst (monolith-TPP-Co-HZ) with abundant amine sites exhibits strong chemisorption of CO₂ and a CO₂/N₂ selectivity of 55. Under mild conditions (15% CO₂/85% N₂, 25 °C), the monolith converts propylene oxide to cyclic carbonate in 76% yield (turnover frequency (TOF) = 24 h⁻¹). This work offers a new approach for the development of integrated catalytic systems for the catalytic conversion of low-concentration CO₂.