The physical properties of chromium oxide—aluminium oxide catalysts - II. Electrical properties
P. R. Chapman, R. H. Griffith, J. D. F. Marsh
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Source: Crossref
Published: Jul 7, 1954
DOI: 10.1098/rspa.1954.0169
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Abstract The electrical conductivity and thermo-electric potential of co-precipitated chromium oxide-alumina catalysts have been measured. The addition of alumina at first produces a rapid increase in the conductivity, but with higher concentrations of alumina this subsequently falls to values below that of chromium oxide alone. Catalysts reduced in hydrogen at 500°C are n-type semi-conductors if they contain more than about 35% of chromium oxide; those with lower chromium content, and all mixtures after heating in air, are p-type semi-conductors. Energies of activation for both types of conduction have been calculated.
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