Effect of calcination and/or incorporation of trivalent metal ions on the physicochemical properties of nickel oxide catalyst

Abstract

The effect of the calcination and/or the incorporation of Cr, Al or Fe ions in NiO catalysts on the excess oxygen on the surface and the structural and textural properties was investigated using a number of physico-chemical techniques. The results indicated that homogeneous solid solutions were obtained only when the doping level was less than 3 at.% M³⁺. NiOOH species formed topochemically during the hydrothermal decomposition of the parent Ni(OH)₂ at 300 – 400 °C were found to be associated with the maximum surface content of excess oxygen. The excess oxygen species were identified from IR and X-ray photoelectron spectra.