The preparation, activation and some properties of SnO2 containing small amount of Cr2O3 (0,01-1 mole %), which results in high activity in the catalytic reduction of NO with fuels, have been described. The incorporation of Cr2O3 into SnO2 was investigated by means of electrical conductivity measurements. The incorporation begins above 450°C and it is greatly accelerated by oxygen. It was found that during the incorporation of chromium into SnO2 in air, a part of the CrIII ions is oxidized to a higher valence state and stabilized in the surface layer of SnO2. Detailed experiments have been carried out to study the effect of various conditions on the incorporation and oxidation of chromium ions.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry