高活性纳米镍催化剂的制备及其催化性能研究

Synthesis of Nickel Nanoparticles and the Study of its Catalytic Performance

在液相化学还原法的基础上引入实验室自制的还原助剂M-1,制备了纳米镍粉催化剂。采用XRD,SEM,Mastersizer 2000粒径分析仪、EDS等方法对其结构及性能进行了表征,并在对硝基苯酚催化加氢反应中考察了其催化性能。结果表明,所得粉体为平均粒径57nm的纳米镍粉体;在同样的实验条件下,该催化剂的催化活性大约是工业上通常使用的Raney Ni的16倍。还原助剂的引入导致催化剂晶粒的减小,从而提高了催化剂的催化活性。

The nickel nanoparticles with high catalytic activity was prepared from aqueous solutions without surfactants or dispersants by an improved chemical reduction with the addition of a self-made reduction accessory M-1 as an ingredient. The prepared nickel nanoparticle catalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), MasterSizer 2000, EDS microanalysis. The experimental results show that the prepared nickel particles are pure cubic crystallite with average particle size of 57 nm. In comparison with Raney-Ni, the prepared nickel catalyst exhibited higher catalytic activity. The hydrogenation rate of fresh IP-Ni was calculated, which was 5 times higher than that of the fresh CV-Ni, and 16 times higher than that of fresh Raney-Ni. The addition of the self-made M-1 during preparing procedure could reduce the grain size and improve the catalytic activity of the prepared nickel nanoparticles.