J. Phys. IV France 07 (1997) C1-687-C1-688
Effets of Cobalt Oxide-Iron Oxide Ratios on the Catalytic Activity of Cobalt Ferrite Spinel CatalystsA.A. Said, K.M. Abd El-Salaam, E.A. Hassan, A.M. El-Awad and M.M.M. Abd El-Wahab
Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt
The cobalt ferrite spinels CoxFe3-xO4 (0.6<x<2.4) have been prepared by coprecipitation. The structures of the catalysts were characterized by DTA, X-ray diffraction, surface area and electrical conductivity measurements. The catalytic decomposition of isopropanol was carried out at 325°C using a flow system. The results obtained revealed that the activity and selectivity of the catalysts are strongly affected by the structure of the ferrite spinel formed as a result of the solid - solid interaction between Fe2O3 and Co3O4. The normal spinel formed at (x = 1) gives low activity and low selectivity in comparison with the spinels deviated from the stoichiometry. Additionally, a little change in catalytic behaviour observed on increasing the calcination temperature from 400° to 600°C. Correlations between the composition, electronic and catalytic properties of the catalysts are reported.
© EDP Sciences 1997