The influence of Ni(II) ion on the properties of NiOAl2O3 catalyst prepared by impregnation method

The behavior of the NiOAl2O3 catalysts is strongly dependent on the preparation method and pretreatment conditions. In the present work, we investigate the influence of Ni(II) content and various treatment temperatures on the properties of NiOAl2O3 catalysts prepared by impregnation method. On the basis of experimental diffuse reflectance spectroscopy data of electronic d–d transitions of Ni(II) promoter ion, the energies of electronic states in spinel‐like structure were calculated and the most probable scheme of molecular orbital have been proposed. The results of studying the system model allowed the conclusion that the type of contact between the starting phases has a decisive influence on the coordination of Ni(II) ions. Copyright © 2010 John Wiley & Sons, Ltd.