Synthesis of MS-NH2@Pd-MS Nano-catalyst and Its High Catalytic Performance in Suzuki Reaction
This paper reported a nano-palladium catalyst with double-layer mesoporous structure.The inner layer of mesoporous SiO2(MS)was prepared by soft-template method with a pore size of 4～7 nm.After modification with APTS,the nano palladium particles were loaded onto this layer to form MS-NH2@Pd.Subsequently,the silica was then encapsulated on the surface of MS-NH2@Pd,and a second mesoporous structure is formed by surface-protected base etching.The pore diameter of the outer shell is about 12～15 nm.The characterization of XRD,SEM,TEM,XPS showed that the size of Pd nanoparticles was about 3～5 nm which evenly distributed on the carrier.This catalyst showed excellent catalytic activity and functional group compatibility in the Suzuki coupling reaction,and there was no significantly reduction in catalytic activity after 6 times of recovery,which showing excellent stability.
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