.gamma.-Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4 spinels
US4960583A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Dec 16, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Oxides having the spinel structure of .gamma.-Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4 type, substituted by trivalent and monovalent metals, or doped with non-spinel derivatives thereof, more particularly iron/aluminum/potassium oxides well suited as dehydrogenation catalysts, e.g., for dehydrogenating ethylbenzene into styrene, are prepared by thermally decomposing mixed iron, aluminum and potassium salts, notably the oxalates thereof, in the presence of air, then reducing the product of thermal decomposition at a temperature of less than 400.degree. C., advantageously in the presence of steam and hydrogen, and optionally oxidizing the product of reduction; oxides of .beta.-alumina structure are also produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.