Electrical conductivity measurements of mixed oxide catalysts used as a typical reaction of heavy water production

摘要: The alternative conductivity (AC) of nickel catalysts promoted with Fe2O3 and supported with Al2O3, CoO and MnO was examined using a conductivity bridge and applying the complex impedance method. The obtained semicircles permitted calculation of the electrical conductance for the examined samples. The results show that they have an electronic nature. The electrical properties of the catalysts depend on their structure and composition. Their resistance may be a combination of bulk crystal resistance and grain boundary one. The variation of conductivity with temperature for the examined catalytic systems shows an increase of resistance with decreasing temperature, indicating an activated conduction and semiconductor nature.