Détail de la notice
Titre du Document
Comparative Study on the Formation and Reduction of Bulk and Al2O3-Supported Cobalt Oxides by H2-TPR Technique
Auteur(s)
YUGUO JI ; ZHEN ZHAO ; AIJUN DUAN ; ...
Résumé
A systematic and comparative study of the decomposition procedures of unsupported and Al2O3-supported Co(NO3)2·6H2O, as well as the reduction procedures of bulk Co3O4 and Al2O3-supported Co3O4 was carried out. A series of decomposition products of bulk and Al2O3-supported Co(NO3)2·6H2O, and bulk cobalt oxides (Co3O4 and CoOOH) and Al2O3-supported Co3O4 (Co/Al2O3 catalysts) were prepared by the methods of calcination, deposition-precipitation, and incipient-wetness impregnation. The bulk and supported samples were characterized by different techniques, including XRD, UV-vis-NIR, TG-DTA, gas analyzer, and H2-TPR. The results show that the CoO species first appears in the calcination process of bulk Co(NO3)2·6H2O decomposition, and then CoO is oxidized to form Co3O4. CoO-Al2O3 composite oxide first appears in the calcination process of Al2O3-supported Co(NO3)2·6H2O decomposition. CoO disperses on the surface of Al2O3 support at first and then forms a multilayer with the decomposition of Co(NO3)2. Finally, CoO-Al2O3 composite oxide, which is very difficult to be reduced to metal Co, was oxidized to Co3O4. Particularly, it is thoroughly analyzed that the attribution of each reduction peak in the H2-TPR pro
Editeur
American Chemical Society
Identifiant
ISSN : 1932-7447
Source
Journal of physical chemistry. C A. 2009, vol. 113, n° 17, pp. 7186-7199 [14 pages]
Langue
Anglais
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