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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