Effect of Structural Promoters on the Reduction Process of Nanocrystalline Cobalt Oxides

摘要

The effect of structural promoters (CaO i Al₂O₃) addition on the reduction process of cobalt oxides was studied. The mixture of hydroxides of cobalt, calcium and aluminium, obtained by precipitation from nitrates, was calcinated at 900 °C. After the reduction with hydrogen, the nanocrystalline cobalt was obtained, doted with small amount of structural promoters. The reduction kinetics was studied using thermogravimetry. The reduction process is described by the equation: α=1-(1-α₀)·e^-kT . The apparent activation energy of the reduction process was determined.