Über den Mechanismus der Bildung von Chrom(IV)-oxid aus Chromylchlorid

On the Mechanism of the Formations of Chromium(IV)oxide from Chromyl Chloride The decomposition of chromyl chloride in the temperature range from 380 to 400°C leads with increasing oxygen pressure to chromium oxides containing up to nearly 90% of CrO₂. The interaction with the chlorine prevents a quantitative formation of CrO₂. Up to 315°C during the decomposition of chromyl chloride chromium oxides of higher valencies are formed separating chlorine and taking up oxygen simultaneously. By working in flowing oxygen it could be proved that the decomposition goes at lower temperatures via the nondetectable CrO₃. By heating gradually and by removing the chlorine as far as possible stoichiometric CrO₂ at oxygen pressures above 60 atm could be obtained.