Synthesis Of Functionalized Porous Organic Polymers Aed Properties In The Catalysis

Porous organic polymer(POPs)is concerned by more and more researchers because of its widely use.The specific surface area of POPs is higher than other materials in general,and it has many characteristics,such as the advantages of the functional group,the size of the pore size can be adjusted and so on,which makes the multiphase catalysis based on the POPs material has broad application prospects.The main idea of this paper is to use the functionalization of pyridine nitrogen to immobilizing palladium nanoparticles by ion exchange and modifying the surface of POPs materials with different sizes,different active groups and the surface of the materials to prepare different catalysts for experimental design and to explore the activity experiments of the catalyst.The contents are as follows:The first part of the paper: 4-vinyl pyridine is react with two vinyl benzene,and then react with iodide to obtain POPs.Through the surface modification of iodide,the palladium metal nanoparticles were immobilized by ion exchange,and the catalyst Pyridine-POP/Pd was obtained.At the same time,the catalyst was characterized by a variety of catalyst characterization instruments.The catalyst Pyridine-POP/Pd was applied to the coupling reaction of Heck,and the catalytic performance was better,and the catalyst was extended to different reaction substrates.The catalyst still showed excellent catalytic performance.Through the cycle experiment,the catalyst was found to be stable,even cycle for 4 times,the yield of the catalytic product remained at 90% Up.In the second part of the thesis,the nPhen-POP series of catalysts were obtained by a simple Friedel reaction,and the catalysts were characterized by a variety of catalyst characterization instruments,which were different from the benzene based organic compounds(nPhen).The nPhen-POP catalyst is used to catalyze the cyclic carbonation of carbon dioxide and epoxy alkanes.Although the activity of the porous organic polymer catalyst is slightly worse than the homogeneous monomer molecular catalyst(nPhen),the catalytic performance still shows a better catalytic performance(the selectivity of the cyclic carbonate is more than 86%,The conversion rate is more than 52%).The results also show that the catalytic conversion of carbon dioxide is closely related to the adsorption properties and functional groups of the materials.With the larger benzene compounds,the larger the surface area and the more pores are,and the pores are concentrated in the range less than 5nm,which is beneficial to the adsorption products of carbon dioxide,and it is also found that the material is relative to the adsorption of nitrogen.The adsorption effect of carbon dioxide is better,which indicates the develop direction of heterogeneous catalyst.