In situ XRD study of nanocrystalline cobalt oxide reduction View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2009-03

AUTHORS

O. A. Bulavchenko, S. V. Cherepanova, V. V. Malakhov, L. S. Dovlitova, A. V. Ishchenko, S. V. Tsybulya

ABSTRACT

The reduction of nanocrystalline cobalt oxide samples (single-phase and supported on γ-Al2O3) was studied using in situ X-ray diffraction (XRD) analysis. The atomic structures of single-phase and supported Co3O4 samples were refined, and the occurrence of cationic vacancies was demonstrated. A set of methods (XRD, temperature-programmed reduction, and differential dissolution) was used to find that the reduction of supported and unsupported model cobalt oxide was considerably different. The single-phase sample was reduced in undiluted hydrogen to cobalt metal with a hexagonal closely packed structure. The reduction of the supported sample (unlike the single-phase sample) occurred through the formation of a crystalline CoO phase to the formation of cobalt metal with a face-centered cubic structure. Interaction of cobalt oxide with the γ-Al2O3 support, which hinders the reduction to cobalt metal, was detected. More... »

PAGES

192-198

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0023158409020086

DOI

http://dx.doi.org/10.1134/s0023158409020086

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037725182


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