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通过在3-氨基苯酚与甲醛聚合成球的过程中引入模板剂二氧化硅纳米颗粒,随后碳化、腐蚀除硅,制备得到了具有良好介孔结构的碳纳米球.通过透射电子显微镜(TEM)、粉末X射线衍射(XRD)、N_2等温吸脱附(BET)等表征手段对样品形貌和结构进行了分析,表明介孔碳球分散性良好、比表面积较大(~294m~2/g)、孔径分布均匀(~3.8nm).以该介孔碳球为载体,负载金属钯纳米颗粒,得到了金属颗粒分散均匀、粒径小(~2nm)的Pd/介孔碳球复合材料.应用于催化碘苯和苯硼酸的Suzuki偶联反应中,具有良好的催化活性.反应5min,碘苯的转化率达99.06%,催化剂循环使用7次,碘苯转化率未见明显下降.
The carbon nanospheres with good mesoporous structures were prepared by introducing the template silica nanoparticles into the sphere when 3-aminophenol and formaldehyde were spheroidized, followed by carbonization and etching to remove silicon.The microstructure of the carbon nanospheres was characterized by transmission electron microscopy (TEM) , Powder X-ray diffraction (XRD) and N 2 isothermal adsorption-desorption (BET) were used to characterize the morphology and structure of the samples. The results showed that the mesoporous carbon balls have good dispersibility and large specific surface area (~ 294m 2 / g ), And uniform pore size distribution (~3.8nm) .With the mesoporous carbon sphere as a carrier, the Pd / mesoporous carbon spherical composite with uniform dispersion of metal particles and small particle size (~ 2nm) was obtained. In the Suzuki coupling reaction catalyzed by iodobenzene and phenylboronic acid, the conversion of iodobenzene reached 99.06% after 5 min of reaction, and the conversion of iodobenzene did not decrease obviously.