Preparation And Catalytic Property Of Ferrocenimine Palladium/Cobalt Self-Assembly Catalytic Film Supported On GO For Suzuki Coupling Reaction

In this paper,ferrocene imine Palladium/Cobalt self-assembly catalytic film supported on graphene oxide(GO)(defined as GO@APTES-Fcl-Pd/Co)was prepared by self-assembly way and characterized.Its catalytic performance and mechanism in Suzuki coupling reaction were systematically studied.The results are as follows:1.Using GO as a carrier,Schiff base imine structure was grafted from its surface by silane coupling agent through self-assembly method.After coordination with Pd/Co,a stable and ordered Schiff base imine Palladium/Cobalt self-assembly catalytic film supported on GO(GO@APTES-Fcl-Pd/Co)was fabricated and was characterized by XRD,Raman,XPS,SEM,TEM,HR-TEM and ICP-AES.2.Using Suzuki-Miyaura reaction as template,the catalytic performance of GO@APTES-Fcl-Pd0.1Co0.9 catalyst was studied.The optimized reaction conditions were determined as follow:condition:K2CO3,at 70 ℃,and 120 min.The yield up to 99%was obtained in Suzuki coupling reaction by reacting p-bromotoluene and phenylboric acid,and the catalyst could be recycled at least seven times without obvious deactivation.Compared with GO@APTES-Fcl-Pd catalyst,catalytic activity of GO@APTES-Fcl-Pd0.1Co0.9 could be improved due to the synergistic effect between Pd and Co.3.The catalytic mechanism in Suzuki coupling reaction catalysed by GO@APTES-Fcl-Pd0.1Co0.9 was systematic explored by thermal filtration experiment,catalyst poisoning experiment,XPS,in-situ infrared,XRD,Raman spectroscopy.The results showed that:The catalytic reaction was the heterogeneous catalysis occurred at the interface,Pd(0)and Co3O4 as the catalytic activity center could prompt the activity through the bimetallic synergy,meaning the electron of carrier transferred to the ligand,then to metal active center,which made Pd more negativity which could reacted with halogenated aromatics to form oxidative addition steps.The deactivation mechanism of the catalyst was also investigated.The deactivation mechanism of the catalyst was analyzed by FT-IR,XPS,TEM,HR-TEM,Raman,XRD.The results showed that the deactivation of the catalyst was caused by the aggregation of the active metal center and the destruction of the catalyst.