The physical properties of chromium oxide—aluminium oxide catalysts - II. Electrical properties

Autor:	R. H. Griffith, P. R. Chapman, J. D. F. Marsh
Rok vydání:	1954
Předmět:	Materials science Hydrogen Inorganic chemistry chemistry.chemical_element Conductivity Thermal conduction Catalysis chemistry.chemical_compound Chromium General Energy chemistry Electrical resistivity and conductivity Aluminium oxide Chromium hydride
Zdroj:	Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences. 224:419-426
ISSN:	2053-9169 0080-4630
DOI:	10.1098/rspa.1954.0169
Popis:	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.
Databáze:	OpenAIRE
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