Magnetic iron oxide incorporated covalent organic polymers as a catalyst for cyclic carbonate synthesis

초록

Covalent organic polymers are an important class of nanoporous materials that are attracting increased attention owing to their potential applications in gas adsorption/separation and catalysis. These materials possess many advantages compared with conventional zeolites and metal organic frameworks, such as easy synthesis, high surface area, low density, and high chemical stability in both aqueous and organic environment. In addition, incorporation of nitrogen functionality on the surface of the polymer matrices can improve the support capacity for holding metal NPs. In this work, a uniformly dispersed Fe3O4 nanoparticles supported on covalent organic polymer was synthesized and used as magnetically separable catalyst for cyclic carbonate synthesis via cycloaddition reaction of CO2 and epoxide. The catalytic activity for the cycloaddition reaction by the covalent organic polymer was promoted by the introduction ofFe3O4, and at the same time the catalysts could be was separated using magnetic field. The catalyst stability was confirmed by hot-filtering and recycling tests. The plausible mechanistic pathway of the cycloaddition reaction with Fe3O4 supported covalent organic polymer was also proposed.