Preparation and Characterization of a New Ternary Chromium(III)–Molybdenum(VI) Oxide Cr2–2xMoxO3
| Autor: | Roger Bühler, Christian Baerlocher, John R. Günter |
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| Rok vydání: | 1998 |
| Předmět: |
Absorption spectroscopy
Coprecipitation Inorganic chemistry Oxide Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound symbols.namesake X-ray photoelectron spectroscopy chemistry Materials Chemistry Ceramics and Composites symbols Mixed oxide Physical and Theoretical Chemistry Spectroscopy Raman spectroscopy Powder diffraction Nuclear chemistry |
| Zdroj: | Journal of Solid State Chemistry. 140:350-353 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1998.7899 |
| Popis: | A new mixed oxide was prepared by coprecipitation of Cr(NO 3 ) 3 and (NH 4 ) 6 Mo 7 O 24 from aqueous solution and subsequent calcination. The ternary oxide with the general stoichiometry Cr 2–2 x Mo x O 3 was characterized by X-ray diffraction (XRD), thermoanalysis (TA), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), atomic absorption spectroscopy (AAS), and Raman scattering. The new oxide showed the typical temperature-dependent electric conductivity known for semiconductors. The structure was refined with the Rietveld method from powder diffraction data. It is strongly related to the hexagonal chromiumsesquioxide structure. Preliminary catalytic experiments revealed a low combustion rate for methane but an increasing preference for C–C coupling reactions with higher Mo content. |
| Databáze: | OpenAIRE |
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