Transition Metal Salts and Oxides on Alumina

4 Transition Metal Salts and Oxides on Alumina. Transition metal salts, particularly chlorides and nitrates, are frequently used as starting materials for the preparation of supported transition metal oxides or supported precursors for supported metal catalysts. Also, many catalytic materials, particularly supported molybdenum and tungsten oxide and sulfide catalysts, contain transition metal ions, namely Co, Ni , and Fe as promoters. Thus, it is interesting to study the spreading and wetting behavior of salts of these transition metals and of their oxides. This is of particular importance for promoted catalyst materials, since in practice the incorporation of the active phase and the promoter should be possible in one step for economic reasons. 

Xie and coworkers studied mixtures of Y-AI2O3 with CuCl, CuCl2, and with the dichloride hexahydrates and nitrate hexahydrates of cobalt and nickel and 

Ni(N03)2 on the Al203-surface. It may thus be predicted that by appropriate choice of the conditions Co- and Ni-promoted catalysts such as molybdate-type materials can also be prepared by this dry technique. 

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