The nature of the iron oxide-based catalyst for dehydrogenation of ethylbenzene to styrene. 1. Solid-state chemistry and bulk characterization
- Fritz Haber Institut der Max Planck Gesellschaft, Berlin (Germany)
- Univ. of Cambridge (England)
The active catalyst for the dehydrogenation of ethylbenzene is generated from a precursor material consisting of hematite and potassium hydroxide (with additional promotors) during the initial phase of catalyst operation at 873 K in a steam atmosphere. The active phase is a thin layer of KFeO{sub 2} supported on a solid solution of K{sub 2}Fe{sub 22}O{sub 4}. The ternary K{sub 2}Fe{sub 22}O{sub 34} phase acts as storage medium from which the active surface is continuously supplied with a near-monolayer coverage of potassium ions in an environment of Fe{sup 3+}ions. The catalyst undergoes a continuous solid-state transformation caused by the migration of potassium ions. This requires a certain degree of imperfection in the matrix lattice which originates from the catalyst preparation and from the addition of promotors which act on the iron oxide lattice rather than on the surface chemistry. The identity of the active phase with KFeO{sub 2} was confirmed by independent synthesis of this phase and comparison of its catalytic activity with that of the technical catalyst.
- OSTI ID:
- 5750417
- Journal Information:
- Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 126:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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ALKALI METAL COMPOUNDS
ALKYLATED AROMATICS
AROMATICS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DEHYDROGENATION
DISPERSIONS
FERRATES
HEMATITE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MINERALS
MIXTURES
ORES
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
PROMOTERS
SOLID SOLUTIONS
SOLUTIONS
STYRENE
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS