Nitrogen-Rich Porous Organic Polymers with Supported Ag Nanoparticles for Efficient CO(2) Conversion

As CO(2) emissions increase and the global climate deteriorates, converting CO(2) into valuable chemicals has become a topic of wide concern. The development of multifunctional catalysts for efficient CO(2) conversion remains a major challenge. Herein, two porous organic polymers (NPOPs) functionalized with covalent triazine and triazole N-heterocycles are synthesized through the copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) reaction. The NPOPs have an abundant microporous content and high specific surface area, which confer them excellent CO(2) affinities with a CO(2) adsorption capacity of 84.0 mg g(−1) and 63.7 mg g(−1), respectively, at 273 K and 0.1 MPa. After wet impregnation and in situ reductions, Ag nanoparticles were supported in the NPOPs to obtain Ag@NPOPs with high dispersion and small particle size. The Ag@NPOPs were applied to high-value conversion reactions of CO(2) with propargylic amines and terminal alkynes under mild reaction conditions. The carboxylative cyclization transformation of propargylic amine into 2-oxazolidinone and the carboxylation transformation of terminal alkynes into phenylpropiolic acid had the highest TOF values of 1125.1 and 90.9 h(−1), respectively. The Ag@NPOP-1 was recycled and used five times without any significant decrease in catalytic activity, showing excellent catalytic stability and durability.