One pot synthesis rich in bromine anion ionic porous organic polymer for CO2 catalytic conversion

The porous organic polymers HIP-Br-1 and HIP-Br-2 rich in bromine anions were prepared by quaternization one-pot method. The contents of N and Br in HIP-Br-1 reached 15.93 wt% and 6.94 wt% respectively. These high content of bromine ions combined with rich mesoporous and macroporous structures gave the materials good catalytic ability. The material has moderate adsorption heat (28-36 kJ/mol). The catalytic experiment shows that HIP-Br-1 has good catalytic performance. Under the mild conditions of 0.4 MPa CO2, 60 oC, and 9 h, without any cocatalyst and solvent, 93% of propylene oxide can be converted to cyclic carbonate. The catalyst has good repeatability, and the conversion efficiency to cyclic carbonate did not significantly decrease after four catalytic experiments. Density functional theory (DFT) shows that HIP-Br-1 can effectively activate PO and CO2, thereby enhancing the catalytic activity of cycloaddition reactions. This work explores the one-step synthesis of ion-type porous organic polymers rich in nitrogen atoms.