Preparation Of Imine Bonded Porous Organic Polymers And Their Catalytic Hydrogenation/dehydrogenation Reactions

Porous organic polymers（POPs）typically have characteristics such as high surface area,adjustable pores,and designable structures.In recent years,the encapsulation effect of porous organic polymers on metal nanoparticles has attracted researchers’attention.Although smaller metal nanoparticles have more active site and higher catalytic selectivity,they are thermodynamically unstable,prone to aggregation and reduce catalytic activity.Through the encapsulation of porous organic polymers,smaller,uniformly dispersed and stable metal nanoparticles can be obtained.By utilizing the pore confinement effect of porous organic polymers to restrict the growth of metal nanoparticles or introducing functional groups that can interact with metal precursors into the porous organic polymer framework,researchers have successfully prepared metal supported catalysts with various functions and demonstrated excellent performance in multiple catalytic reactions.This article mainly uses the prepared new porous organic polymer as the carrier to prepare gold supported catalysts using impregnation reduction method,and studies its catalytic performance in catalytic hydrogenation/dehydrogenation reactions.The main conclusions of this article are as follows:（1）A new type of ionic triazole trialdehyde compound A₁ with triazole groups was synthesized through quaternization reaction,and the ionic porous organic polymer A₁POP was successfully prepared through imine condensation reaction with p-phenylenediamine.The prepared A₁POP has a mesoporous structure and a charged triazole group,making it a good carrier for encapsulating metal nanoparticles.Successfully loaded gold nanoparticles into polymer A₁POP using impregnation reduction strategy,and prepared Au@A₁POP catalyzer.The prepared gold nanoparticles have a smaller size and are evenly dispersed.The effect of different gold loading on the catalytic performance of 4-neneneba nitrophenol was studied by catalytic reduction experiment.The results showed that the catalytic performance gradually improved with the increase of gold loading,and the reaction rate constant was 0.374 min^-1under the optimal loading.（2）A new type of porous organic polymer Poly Cage was prepared by using porous organic cages as co polymerization monomers and copolymerizing with sebacic chloride.The prepared Poly Cage retains the cage cavity structure of the porous organic cage precursor,providing conditions for the restricted growth of metal nanoparticles.Successfully encapsulated gold nanoparticles on Poly Cage carrier through impregnation reduction method,resulting in Au@Poly Cage catalyzer.The catalytic performance of it for the release of hydrogen from ammonia borane alcohol was studied,and the TOF value reached 150 min-1 under approximately 3%gold loading conditions,demonstrating good catalytic potential.