Redispersion of platinum crystallites supported on alumina. role of wetting
Journal Article
·
· J. Catal.; (United States)
Transmission electron microscopy showed that platinum deposited on thin alumina films formed platinum particles when heated in hydrogen at 750/sup 0/C for 12 hr; that further heating in oxygen for 48 hr caused no significant crystallite change, although sintering is observed in industrial catalysts under similar conditions; that further heating at 750/sup 0/C in hydrogen for 48 hr caused no significant change in crystallite size; and that after additional five cycles of alternating hydrogen and oxygen treatments for 3-5 hr at 750/sup 0/C, sintering occurred in hydrogen and redispersion in oxygen. Redispersion also occurred in wet nitrogen. Some crystallites increased and some decreased in wet hydrogen. Mechanisms of redispersion by fracture and redispersion by spreading are discussed.
- Research Organization:
- State Univ. of New York, Buffalo
- OSTI ID:
- 6356691
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 59:1; 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
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
DATA
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
HEATING
HYDROGEN
INFORMATION
METALS
MICROSCOPY
NONMETALS
NUMERICAL DATA
OXYGEN
PARTICLE SIZE
PLATINUM
PLATINUM METALS
SINTERING
SIZE
SYNTHESIS
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VERY HIGH TEMPERATURE
400201* -- Chemical & Physicochemical Properties
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
DATA
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
HEATING
HYDROGEN
INFORMATION
METALS
MICROSCOPY
NONMETALS
NUMERICAL DATA
OXYGEN
PARTICLE SIZE
PLATINUM
PLATINUM METALS
SINTERING
SIZE
SYNTHESIS
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VERY HIGH TEMPERATURE