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Novel magnetically recyclable Pd/γ-AlOOH@Fe3O4 catalysts were prepared using γ-AlOOH@Fe3O4 as a magnetic supporter and nano-Pd particles as the active catalytic component.The structure of the catalysts was characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),N2 adsorption-desorption,and a vibration sample magnetometer(VSM).The catalytic activity and recyclability for the Heck coupling reaction were investigated.Results showed that the magnetic γ-AlOOH@Fe3O4 possessed a core-shell structure,as well as that the nano-Pd particles were 6–8 nm and had been well dispersed in the γ-AlOOH shell.In the Heck coupling reactions,the magnetic Pd/γ-AlOOH@Fe3O4 catalysts exhibited good catalytic activity and recyclability.For the(0.021 mol%)Pd/γ-AlOOH@Fe3O4 catalyst,the bromobenzene conversion and product yield reached about 100%and 96.3%,respectively,under a 120°C reaction temperature and 12 h reaction time.After being recycled 8 times,the conversion of bromobenzene and the recovery of the catalyst were about 90%and 93%,respectively.The nano-Pd particles were kept well dispersed in the used Pd/γ-AlOOH@Fe3O4 catalyst.
Novel magnetically recyclable Pd / γ-AlOOH @ Fe3O4 catalysts were prepared using γ-AlOOH @ Fe3O4 as a magnetic supporter and nano-Pd particles as the active catalytic component. The structure of the catalysts was characterized by X-ray diffraction (XRD) Transmission electron microscopy (TEM), N2 adsorption-desorption, and a vibration sample magnetometer (VSM). The catalytic activity and recyclability for the Heck coupling reaction were investigated. Results showed that the magnetic γ-AlOOH @ Fe3O4 possessed a core-shell structure , as well as that of nano-Pd particles were 6-8 nm and had been well dispersed in the γ-AlOOH shell. the Heck coupling reactions, the magnetic Pd / γ-AlOOH @ Fe3O4 compounds exhibited good catalytic activity and recyclability. The bromobenzene conversion and product yield reached about 100% and 96.3%, respectively, under a 120 ° C reaction temperature and 12 h reaction time. After being recycled 8 times (0.021 mol%) Pd / γ-AlOOH @ Fe3O4 catalyst , the conversion of bromobenzene and the recovery of the catalyst were about 90% and 93%, respectively. The nano-Pd particles were kept well dispersed in the used Pd / γ-AlOOH @ Fe3O4 catalyst.