Imidazole based ionic liquid grafted graphene for enhancing the new green conversion process of carbon dioxide

Carbon dioxide (CO 2 ) has been recognized a renewable C1-level green chemical synthesis feedstock . Achieving 100 % atom utilization is possible through the cycloaddition reaction of CO 2 with epoxides . Ionic liquids are commonly used catalysts for this reaction, but conventional immobilization methods may lead to the loss of active components under severe conditions. Developing a new Ionic Liquid catalytic system offers a promising and eco-friendly approach to efficient CO 2 cycloaddition. In this study, imidazolium ionic liquid was chemically immobilized on graphene oxide (GO) to get a novelty catalyst GO-SmIm Br. The impact of catalyst dosage, temperature, pressure, and reaction time on the reaction performance of CO 2 and propylene oxide was systematically investigated in a batch reaction system, achieving a propylene carbonate yield of up to 90.4 % in the CO 2 cycloaddition reaction. Even after five cycles, the yield only decreased by 9.6 %, showcasing its robust catalytic activity . Further assessment in a fixed-bed reactor at 120 °C for 8 h demonstrated a continuous propylene carbonate yield of 55.6 %, highlighting the potential of GO-SmIm Br for efficient and sustainable CO 2 utilization.