| Because of special phy-chemical properties of the products, biphenyl compounds, Suzuki-Miyaura cross-coupling reaction is one of great important reaction in the using of many fields, such as herbicide, pesticide and liquid crystal materials. While some researches for recyclable catalyst of Palladium nanoparticles and its supporters, recently years, have been in limelight and widely aroused concern, these catalysts, Pd@Al2O3 and Pd@SiO2, are too difficult to perform selective catalysis. Making great efforts on studying selectivity of catalysis of Palladium nanoparticles, as a consequence, is becoming more and more significant in public.In this paper, through some Classic methods, we successfully synthesize a series of MOFs, because of the water stability of which, finally we choose a method called capillary impregnation to synthesize Pd@MOFs materials by using NaBH4 reduction system. On the base of some characterization means of X-Ray Diffraction (XRD) and Transmission Electron Microscopy(TEM), we prove that, successfully, Palladium nanopartiCles are put into the pore of MOFs. Meanwhile, during the process of reactions, crystal structures have not been changed.In the end, in line with different window sizes of the pore of the MOFs, we choose a bigger size one, Pd@MIL-101, and a smaller size one, Pd@HKUST-1,to catalyze Suzuki-Miyaura cross-coupling reactions. During the reactions, the optimum experimental condition have been selected, meanwhile, to the results of these reactions, by compared catalytic activity of Pd@HKUST-1 with pure Palladium nanoparticles and Pd@HKUST-1 with Pd@MIL-101, admirably, we demonstrate there actually exists selective catalysis for Suzuki-Miyaura cross-coupling reactions, especially to smaller size of catalyst, the results of which is very bad. But to the bigger size of catalyst, we can get perfect results of catalysis. At the same time, through recycling reactions, conclusively, the results of recycling reactions are pretty good. |
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