Sintering kinetics of silica- and alumina-supported nickel in hydrogen atmosphere
Journal Article
·
· J. Catal.; (United States)
Loss of nickel surface area occurs during sintering of nickel/silica (Ni/SiO/sub 2/) and nickel/alumina (Ni/Al/sub 2/O/sub 3/) in hydrogen (H/sub 2/) as a result of support collapse and growth of metal crystallites, particularly, in the Ni/Al/sub 2/O/sub 3/ system. Growth of metal crystallites is predominant at high temperatures. Ni/SiO/sub 2/ sinters more rapidly than Ni/Al/sub 2/O/sub 3/ at temperatures above 923K, but less rapidly in H/sub 2/ than in helium (He) atmosphere (data obtained in He from previous study). Orders of sintering decrease with increasing temperature and time of sintering. The kinetic and transmission electron microscopy data are consistent with a shift in mechanism from crystalline migration to atomic migration with increasing temperature and time of sintering. 10 figures, 5 tables.
- Research Organization:
- Brigham Young Univ., Provo, Utah
- OSTI ID:
- 5944526
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 81:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ARGON
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FABRICATION
FLUIDS
GASES
HYDROGEN
INFORMATION
METALS
MICROSCOPY
MICROSTRUCTURE
MINERALS
NICKEL
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
RARE GASES
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TIME DEPENDENCE
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ARGON
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FABRICATION
FLUIDS
GASES
HYDROGEN
INFORMATION
METALS
MICROSCOPY
MICROSTRUCTURE
MINERALS
NICKEL
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POROSITY
RARE GASES
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TIME DEPENDENCE
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY