IR spectroscopic investigation of cation distribution in Zn–Co oxide catalysts with spinel type structure

The structure of Zn–Co spinel prepared by coprecipitation was studied by IR spectroscopy. The characteristic bands of extra OH − and H 3O + groups were shown to exist in IR spectra up to 700°C. Comparing IR spectra of a poorly crystallized low temperature catalyst with that of a perfect Zn–Co spinel...

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Published inJournal of molecular catalysis. A, Chemical Vol. 158; no. 1; pp. 293 - 296
Main Authors Kustova, G.N, Burgina, E.B, Volkova, G.G, Yurieva, T.M, Plyasova, L.M
Format Journal Article
LanguageEnglish
Published Elsevier B.V 08.09.2000
Subjects
Cation ordering
IR spectra
Spinel
Spinel
Cation ordering
IR spectra
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Summary:The structure of Zn–Co spinel prepared by coprecipitation was studied by IR spectroscopy. The characteristic bands of extra OH − and H 3O + groups were shown to exist in IR spectra up to 700°C. Comparing IR spectra of a poorly crystallized low temperature catalyst with that of a perfect Zn–Co spinel, we have associated the noticeable splittings and shifts of the F 1u bands with definite structural distortions. The presence of extra anions in the catalyst with a spinel-like structure in the temperature region 100–700°C is the factor that stabilized the unusual cation distribution in this catalyst. The most plausible cation distribution in such a spinel is proposed as follows: Co 3+ and Zn 2+ are in octahedral positions, and Co 2+ and Zn 2+ are in tetrahedral ones.
ISSN:1381-1169
1873-314X
DOI:10.1016/S1381-1169(00)00093-5