On the sintering of platinum on alumina catalyst

Journal Article · Fri Dec 01 04:00:00 EST 1978 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(78)90217-8· OSTI ID:6971763

Chu, Y F; Ruckenstein, E

Alumina-supported platinum crystallites were studied by transmission electron microscopy after treatment in vacuum, nitrogen, hydrogen, oxygen, or wet hydrogen at 500/sup 0/-850/sup 0/C for 1-48 hr. The results provide evidence that sintering of platinum occurs at least in part by migration and coalescence of crystallites. Sintering was much greater in wet hydrogen than in the other atmospheres; this is attributed to successive oxidation by water and reduction by hydrogen. The degree of mobility of the platinum crystallites and thus of sintering, was enhanced by increasing temperature, periodic oxidation and reduction, reaction of platinum with the substrate, burning off of surface coke, and substrate phase transition.

• Research Organization: State Univ. NY, Buffalo
• OSTI ID: 6971763
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 55:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HIGH TEMPERATURE
HYDROGEN
METALS
MICROSCOPY
NITROGEN
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLATINUM
PLATINUM METALS
SINTERING
TEMPERATURE EFFECTS
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VERY HIGH TEMPERATURE