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

✍ Scribed by G.N Kustova; E.B Burgina; G.G Volkova; T.M Yurieva; L.M Plyasova

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 117 KB
• Volume: 158
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(00)00093-5

✦ Synopsis

The structure of Zn-Co spinel prepared by coprecipitation was studied by IR spectroscopy. The characteristic bands of extra OH y and H O q groups were shown to exist in IR spectra up to 7008C. Comparing IR spectra of a poorly crystallized 3 low temperature catalyst with that of a perfect Zn-Co spinel, we have associated the noticeable splittings and shifts of the F bands with definite structural distortions. The presence of extra anions in the catalyst with a spinel-like structure in the 1u temperature region 100-7008C 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 3q and Zn 2q are in octahedral positions, and Co 2q and Zn 2q are in tetrahedral ones.