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Dissolution of cobalt from CoO / A l 2O3 catalyst with mineral acids / Ilhem Boukerche in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6514–6520 Titre : Dissolution of cobalt from CoO / A l 2O3 catalyst with mineral acids Type de document : texte imprimé Auteurs : Ilhem Boukerche, Auteur ; Naima Habbache, Auteur ; Nadia Alane, Auteur Année de publication : 2010 Article en page(s) : pp. 6514–6520 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst  Mineral  acids Résumé : In this study, the dissolution of CoO from CoO/Al2O3 catalyst with HCl, H2SO4, and HNO3 solutions was investigated in a batch reactor employing parameters that were expected to affect the dissolution rate of cobalt, such as stirring speed, temperature, and acid concentration. It was found that 99.82% of cobalt was dissolved after 4 h with HCl at 2 M, 75 °C, and a liquid-to-solid ratio (l/s) of 100 mL/g, while only 31.96% and 13.57% cobalt dissolutions were reached with H2SO4 and HNO3, respectively, under the same operation conditions. The difference in dissolution rates was due to the presence of different anions (Cl−, NO3−, and HSO4−) involved in the surface reactions. Dissolution kinetic of cobalt was examined according to a heterogeneous model. It was found that the dissolution rate was controlled by surface chemical processes in all cases. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901444y [article] Dissolution of cobalt from CoO / A l 2O3 catalyst with mineral acids [texte imprimé] / Ilhem Boukerche, Auteur ; Naima Habbache, Auteur ; Nadia Alane, Auteur . - 2010 . - pp. 6514–6520. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6514–6520 Mots-clés : Catalyst  Mineral  acids Résumé : In this study, the dissolution of CoO from CoO/Al2O3 catalyst with HCl, H2SO4, and HNO3 solutions was investigated in a batch reactor employing parameters that were expected to affect the dissolution rate of cobalt, such as stirring speed, temperature, and acid concentration. It was found that 99.82% of cobalt was dissolved after 4 h with HCl at 2 M, 75 °C, and a liquid-to-solid ratio (l/s) of 100 mL/g, while only 31.96% and 13.57% cobalt dissolutions were reached with H2SO4 and HNO3, respectively, under the same operation conditions. The difference in dissolution rates was due to the presence of different anions (Cl−, NO3−, and HSO4−) involved in the surface reactions. Dissolution kinetic of cobalt was examined according to a heterogeneous model. It was found that the dissolution rate was controlled by surface chemical processes in all cases. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901444y