✦ LIBER ✦
Caracterisation d'oxydes catalyseurs a base de cuivre et de chrome par diffraction X, spectroscopie infra-rouge et reflectance diffuse
✍ Scribed by G. Wrobel; J. Arsene; M. Lenglet; A. D'Huysser; J.P. Bonnelle
- Book ID
- 103906573
- Publisher
- Elsevier Science
- Year
- 1981
- Weight
- 479 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0390-6035
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✦ Synopsis
A cubic phase close to that of 3'Cr203 has been observed in copper chromite catalysts with atomic ratio 0,8 ~< Cu/Cr ~< 1,5. The infra-red spectroscopy shows that Cr 6÷ ions should be necessary for the stability of the phase.
Cr 3+ ions in tetrahedral environment have been observed in all the catalysts by diffuse reflectance spectroscopy. In reduced state, cubic structure is kept, with formation of Cu metal. The phase is now stabilised by hydroxyls and inversion decreases.