Magnetochemische Strukturuntersuchungen an ZnO-Cr2O3-Katalysatoren

The dispersion and valency state of the chromium ions in ZnO? Cr₂O₃ catalysts have been estimated from the Weiss constants and magnetic moments. The sample containing 4,8% Cr₂O₃ shows an epr signal of Cr⁵⁺ ions. The curves of the apparent activation energy for the hydrogenation reaction of ethylene and of the Weiss constants have both a similar shape.