Pd/Fe3O4催化剂的制备及在Suzuki偶联反应中的应用

Preparation of Pd/Fe3O4 Nanoparticles and Its Catalytic Application in Suzuki Reaction

利用浸渍法制备Pd/Fe3O4负载型磁性纳米催化剂。通过透射电镜(TEM)、X射线衍射(XRD)、电感耦合等离子体-发射光谱(ICP)及振动样品磁强计(VSM)等物理化学手段对其进行了表征。将Pd/Fe3O4催化剂应用于卤代芳烃与芳基硼酸的Suzuki偶联反应中。研究结果表明:Pd/Fe3O4催化剂具有一定的磁性,利用外磁场可方便快速地分离出催化剂。负载Pd的质量分数为12.01%时,催化活性最高;在空气中,无需在惰性气体的保护下能有效地催化芳基硼酸与卤代芳烃的Suzuki偶联反应,催化剂重复使用5次后,催化活性没有明显的降低。

Pd/Fe3O4 nanoparticals have been prepared by the impregnation method. The resulting samples were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), inductively coupled high frequency plasma(ICP), vibrating sample magnetometer(VSM) and so on. The results show that Pd/Fe3O4 nanocatalyst has certain magnetism and can be easily separated by external magnetic field. Pd/Fe3O4 catalytic performance was investigated in Suzuki cross-coupling reaction of aryl halide with arylboronic acid. The products were tested by gas chromatography. It was found that Pd with 12.01% mass loading has the highest catalytic activity. Moreover, the catalytic performance of Pd/Fe3O4 nanoparticals only displays trivial decrease without significant loss of activities after five consecutive experiments.