Kinetics of carbochlorination of chromium (III) oxide

Abstract : Kinetics of the carbochlorination of Cr2O3 has been studied with Cl2+CO gas mixtures between 500 °C to 900 °C using thermogravimetric analysis. The apparent activation energy is about 100 kJ/mol. Mathematical fitting of the experimental data suggests that the shrinking sphere model is the most adequate to describe the carbochlorination mechanism of chromium oxide and that is controlled by the chemical reaction. In the temperature range of 550 °C to 800 °C, the reaction order is about 1.34 and is independent of temperature. Changing the Cl2+CO content from 15 to 100 pct increases the reaction rate and does not affect the reaction mechanism. Similarly, changing the ratio of Cl2/(Cl2+CO) from 0.125 to 0.857 does not modify the carbochlorination mechanism of Cr2O3. In these conditions, the reaction rate passes through a maximum when using a chlorinating gas mixture having a Cl2/(Cl2+CO) ratio of about 0.5.
Type de document :
Article dans une revue
Metallurgical and Materials Transactions B, Springer Verlag, 1998, 29 (4), pp. 729-737. 〈10.1007/s11663-998-0131-x〉
Liste complète des métadonnées

Littérature citée [8 références]  Voir  Masquer  Télécharger

https://hal.univ-lorraine.fr/hal-01508122
Contributeur : Ndue Kanari <>
Soumis le : vendredi 5 mai 2017 - 07:56:11
Dernière modification le : jeudi 11 janvier 2018 - 06:18:12
Document(s) archivé(s) le : dimanche 6 août 2017 - 12:39:11

Fichier

NK_Cr2O3_CarboChlorination.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Ndue Kanari, B.R. Reddy,, I. Gaballah. Kinetics of carbochlorination of chromium (III) oxide. Metallurgical and Materials Transactions B, Springer Verlag, 1998, 29 (4), pp. 729-737. 〈10.1007/s11663-998-0131-x〉. 〈hal-01508122〉

Partager

Métriques

Consultations de la notice

48

Téléchargements de fichiers

25