Manufacture Of Structural Catalytic Device By 3D Printing And The Research Of Its Properties

Mass transfer and catalyst recovery are key issues in the heterogeneous catalytic process,and they have a significant impact on the reaction efficiency and the reuse of catalyst.Therefore,the design and manufacture of catalytic reactors and catalysts with flexible structure and properties are central to heterogeneous reactions.The distinguishing feature of 3D printing technology is that it can save materials,can be quickly formed,can design and precisely control different structures to meet individual requirements,and easily create devices which are difficult to process with traditional technology.Based on above ideas,a new type of structural catalytic device was prepared in this paper,which realized the mass transfer enhancement in the catalytic process and the simple recycling and reuse of the catalyst.(1)By combining 3D printing technology with polymerizable imidazolium ionic liquids,it was convenient to construct an agitating impeller(AI)with prismatic structure and catalytic performance.The ionic liquids supported on the blade imparted its ion exchange capacity,further loading the Pd nanoparticles onto the surface of the paddle by reduction so that the obtained structural,the catalytic device could be applied to the reduction reaction of p-nitrophenol,Suzuki coupling and the dye decolorization reaction.Further research revealed that the design of the prismatic structure on the blade significantly improved the catalytic efficiency of these reactions by improving mass transfer.The reduction reaction yield of p-nitrophenol was close to 100%.Catalytic impellers could be easily separated from the reactor and without a visible leak of Pd catalysts so that they could repeatedly be used more than ten times with high performance.Also,through mass simulation and experimental characterization,the mass transfer mechanism and catalytic surface activity were discussed,and the advantages of 3D printing and polymerizable ionic liquids in heterogeneous reactions were fully demonstrated.(2)Schiff base is a very important compound with a simple synthesis method,low cost of raw materials,and it can form metal complexes with a variety of metal atoms,which can be used as a catalyst in multiple reactions.In this paper,the synthesized Schiff ligand was loaded onto the surface of the photosensitive 3D printed agitating impeller,and further,the Schiff base-Pd(?)complex was formed onto the surface of the impeller by stirring in a palladium acetate solution.The efficiency of the agitating impeller as a catalytic device in the Suzuki coupling reaction was investigated.The results showed that the AI loaded with Schiff base-Pd(?)complex exhibited a more excellent catalytic performance than the AI with Pd loaded in Suzuki coupling reaction.