HDS AND HDN ACTIVITY OF THE TRANSITION METALS NITRIDES PREPARED BY DECOMPOSITION OF MOLECULAR PRECURSORS

摘要

Transition metals nitrides and carbides are important inorganic materials with widespread range of applications,extending from superconductivity to highly resistant alloys and catalysis.Since a temperature-programmed reaction method was applied by Boudart et al 1,2 to synthesize unsupported Mo2N and Mo2C with high specific surface areas,appropriate for catalytic use,a number of reactions including hydrodesulphurization (HDS) and hydrodenitrogenation (HDN) and other hydrogen transfer reactions have been studied over this type of catalysts 3-8.To improve the textural properties of the dispersed nitrides,alternative preparation methods of these compounds represent considerable interest.Recently,molybdate with hexametylentetramine (HMTA) complex has been prepared 9,whose decomposition in the inert atmosphere lead to the highly dispersed Mo2N nitride.Organic molecule served at once as a source of nitrogen and as a reducing agent to remove oxygen in the form of CO.In the present contribution,the preparation of bulk highly dispersed bimetallic and monometallic transition metal nitrides is considered as well as their catalytic activity in hydrodenitrogenation and hydrodesulphurization reaction.The precursors are cobalt and nickel molybdenum complexes with HMTA.