Investigation of catalysts and reactions in catalytic oxidation. III. Formation of texture of pseudoboehmites in liquid granulation of bead supports for catalytic heat generator catalysts
A study has been made of the changes in texture of pseudoboehmite aluminum hydroxides during the stages of peptization and coagulation in liquid forming of Al/sub 2/O/sub 3/ granules. Precipitates obtained at 291-310 K, with the morphology of freshly precipitated pseudoboehmite and with primarily coagulation-type bonds, are readily deaggregated by acid; therefore, it is possible after coagulation, to obtain granules with a uniform pore structure and high strength. With precipitation temperatures of 368-375 K and the formation of crystallization contacts in the hydroxides, treatment with acid does not result in deaggregation. By varying the ratio of the first and second types of precipitate, Al/sub 2/O/sub 3/ granules with predetermined structural and mechanical characteristics can be obtained, suitable for supports of exhaustive oxidation catalysts that are used in catalytic heat generators.
- Research Organization:
- Institute of Catalysis, Novosibirsk (USSR)
- OSTI ID:
- 6008287
- Journal Information:
- Kinet. Catal. (Engl. Transl.); (United States), Journal Name: Kinet. Catal. (Engl. Transl.); (United States) Vol. 29:1; ISSN KICAA
- Country of Publication:
- United States
- Language:
- English
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Cermets
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360203 -- Ceramics
Cermets
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AGGLOMERATION
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC COMBUSTORS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
COMBUSTORS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON MICROSCOPY
FLOCCULATION
FLUIDIZED-BED COMBUSTORS
GRANULAR MATERIALS
HEATERS
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POROSITY
PRECIPITATION
SCATTERING
SEPARATION PROCESSES
SYNTHESIS
TEXTURE
X-RAY DIFFRACTION