Research On Synthesis And Properties Of Quaternary Ammonium Modified Triphase Catalysts Based On Crystalline Porous Materials

Compared with homogeneous catalysts,crystalline porous heterogeneous catalysts show great advantages.Generally,these crystalline porous heterogeneous catalysts materials are superior to other similar materials due to their high stability,selectivity,better catalytic activity,reusability and recyclability.Among them,metal-organic framework(MOFs),as a typical crystalline porous material,has been widely used in catalysis and industry fields because of its flexible adjustability in composition,structure and functional characteristics.In addition,covalent organic framework(COFs),as a new type of organic polymer,has unique advantages in the field of catalysis due to its crystal network structure formed by organic building units and different topological structures.Phase transfer catalyst is a kind of catalyst with high efficiency and mild application conditions in industrial production and organic synthesis.The combination of COFs and MOFs with phase transfer catalysis is expected to overcome the shortcomings of traditional phase transfer catalysts,so it has more development potential?.In this paper,the research progress of porous crystalline nanomaterials based on MOFs and COFS in the field of catalysis was summarized?.We modified the alkanes with long alkyl chain on the MOF to obtain the UiO-68-QA by the pre-synthesis method,and a heteropolyacids quaternary ammonium salt type triphase transfer catalyst with uniform morphology and good thermal stability was obtained by impregnating the UiO-68-QA into heteropolyacids solution.Under mild conditions,{PO4[WO(OO2)2]4}3-@UiO-68-QA can catalyze the oxidation of sulfide in simulated oil,and can be reused for more than three times?.Adopt the same design idea,we modified the alkylamine compounds with long alkyl chain on the COF,to obtain COF-QA and fixed the Pd(0)in the COF by in-situ reduction,then we obtained a triphase transfer catalyst Pd@COF-QA.The coupling reaction of Suzuki-Miyaura in water phase was successfully catalyzed by the phase transfer catalyst at low temperature.The flow-through reactor made of the catalyst realized the coupling catalysis of chlorobenzene and could be reused for more than three times.