A COMPOSITE MATERIAL COMPOSED OF NANOPARTICLES OF TRANSITION METAL AND MAGNETIC FERRIC OXIDE, A METHODE OF PREPARING THE SAME, AND USES OF THE SAME
申请人:Peking University
公开号:EP1826180A1
公开(公告)日:2007-08-29
A composite material composed of nanoparticles of transition metal(s) and magnetic ferric oxide, a method of preparing the same, and uses of the same are provided. The composite material is substantially composed of nanoparticles of transition metal(s) or alloy thereof and nanoparticles of magnetic ferric oxide, the size of nanoparticles of transition metal(s) or alloy thereof is in the range of 0.7 to 5 nm, the size of nanoparticles of magnetic ferric oxide is in the range of 5 to 50 nm, and the amount of transition metal(s) or alloy thereof is in the range of 0.1 to 30 wt%, based on the total weight of composite material, the magnetic ferric oxide is gamma-Fe2O3, Fe3O4, complex obtained from gamma-Fe2O3 by partial reduction, or complex obtained from Fe3O4 by partial reduction. The composite material has a high reactivity and an extreme selectivity for industrial reaction of hydrogenating halogeno-nitro-aromaticics to obtain haalgeno-arylamine, and has important industrial applicability because the problem such as hydrogenolysis-dehalogenation during preparing halogeno arylamine by hydrogenating halogeno-nitro-aromatics is fully resolved by using the composite materials.
本发明提供了一种由过渡金属纳米颗粒和磁性氧化铁组成的复合材料、其制备方法及其用途。该复合材料主要由过渡金属纳米颗粒或其合金和磁性氧化铁纳米颗粒组成,过渡金属纳米颗粒或其合金的尺寸在 0.7至5 nm,磁性氧化铁纳米颗粒的尺寸在5至50 nm之间,过渡金属或其合金的量在0.1至30 wt%之间,基于复合材料的总重量,磁性氧化铁是γ-Fe2O3、Fe3O4、通过部分还原从γ-Fe2O3得到的络合物或通过部分还原从Fe3O4得到的络合物。该复合材料在氢化卤代-硝基芳香族化合物获得卤代芳基胺的工业反应中具有高反应活性和极高的选择性,具有重要的工业应用价值,因为使用该复合材料完全解决了氢化卤代-硝基芳香族化合物制备卤代芳基胺过程中的氢解-脱卤等问题。