Pd Nanoparticles Decorated on Hypercrosslinked Microporous Polymer: A Highly Efficient Catalyst for the Formylation of Amines through Carbon Dioxide Fixation

Abstract CO 2 fixation reaction is one of the most challenging chemical transformations not only in the context of environmental remediation but also for effective utilization of abundant carbon sources in nature. Here, we have stabilized palladium nanoparticles (NPs) at the surfaces of a hypercrosslinked porous polymer bearing carbazole and α,α′‐dibromo‐ p ‐xylene monomeric units to obtain a Pd@HMP‐1 nanocatalyst. The material has been thoroughly characterized by powder XRD, high‐resolution (HR)‐TEM, field‐emission (FE)‐SEM, Brunauer–Emmett–Teller (BET), thermogravimetric (TGA), and FTIR analysis. Pd@HMP‐1 showed excellent catalytic activity towards formylation of amines by carbon dioxide fixation under mild reaction conditions. The high surface area and nitrogen‐rich porous surface make the polymer a suitable support for the palladium nanoparticles and endow it with high recycling efficiency in this CO 2 fixation reaction.