Preparation of Highly Dispersed NiMo Catalysts Supported on Carbon Black Particles of Hollow Spheres

摘要

One of unique carbon blacks, Ketjen Black(KB) which has extremely high surface area and low specific gravity, was selected as a catalyst support to prepare a highly dispersed NiMo catalyst for the hydrogenation of 1-methylnaphthalene(1-MN) using a magnetic-stirred autoclave of 50 ml capacity under the standard conditions of 380℃, 40 min, and 10 MPa H_2 reaction pressure.The catalyst, prepared from Mo dioxyacethylacetonate (MoO_2-AA) and Ni(OAc)_2(Ni acetate) in their methanol solution by successive impregnations of Mo(10 wt%) and Ni(2 wt%), provided the highest conversion of 84 % to methyltetralins. Combinations of metal salts soluble in organic solvent, impregnation solvents, and surface properties of carbon black are suggested to be very important for the preparation of highly active catalysts. The nitric aicd treatment introduced a large number of oxygen functional groups to the carbon black to improve the dispersion of water-soluble metal salts. It is also noted that KB-supported NiMo catalysts showed much higher activity for the present hydrogenation than a commercial NiMo/Al_2O_3.