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以共沉淀法制备的Pd2+掺杂水滑石为前驱体,通过焙烧、还原得到了镁铝复合金属氧化物负载纳米Pd催化剂.利用X射线粉末衍射(XRD),X射线光电子能谱(XPS),场发射透射电子显微镜(TEM)等手段对催化剂进行表征,发现通过Pd2+掺杂水滑石为前驱体制备的复合金属氧化物负载纳米Pd催化剂,可以实现Pd纳米颗粒(3.6 nm)在镁铝复合氧化物表面的均匀分散.该催化剂在催化苯甲醇和苯胺一步法合成N-苄叉苯胺时,在温和的反应条件下表现出良好的催化性能以及对N-苄叉苯胺较高的选择性,产物收率>99%.在循环实验过程中,催化剂表现出较好的稳定性,并且催化活性未见下降.
Pd2 + -doped hydrotalcites prepared by coprecipitation method were used as precursors, and then calcined and reduced to obtain Mg-Al composite metal oxide supported nano-Pd catalysts. X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy The results show that Pd nanoparticles (3.6 nm) can be successfully synthesized in the presence of Mg-Al composite oxide by using Pd (II) -doped hydrotalcite as a precursor for the composite metal oxide supported Pd catalyst. The catalyst has the advantages of good catalytic performance under mild reaction conditions and high selectivity to N-benzylideneaniline in the one-step synthesis of N-benzylideneaniline catalyzed by benzyl alcohol and aniline, and the product The yield was> 99% .In the cycle experiment, the catalyst showed good stability, and no decline in catalytic activity.