DEACTIVATION CHARACTERISTICS IN N-HEPTANE REFORMING REACTION CATALYZED OVER SMALL PT, IR AND PT-IR BIMETALLIC CLUSTERS IN NAY

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The deactivation characteristics of highly dispersed (about 1 nm) Pt, Ir and Pt-Ir bimetallic clusters in NaY were studied by hydrogen chemisorption, coke analysis and temperature programmed oxidation of used catalyst in n-heptane reforming reaction. As the Ir content was increased, the amount of coke decreased. Most of coke was located around the metal cluster and this coke decreased the selectivity of dehydrocyclization in n-heptane reaction. The higher activity and more improved activity maintenance of Pt-Ir/NaY bimetallic catalysts than those of Pt/NaY are related to the less amount of coke formation.
Publisher
BALTZER SCI PUBL BV
Issue Date
1993
Language
English
Article Type
Article
Citation

CATALYSIS LETTERS, v.19, no.2-3, pp.239 - 245

ISSN
1011-372X
URI
http://hdl.handle.net/10203/66282
Appears in Collection
CBE-Journal Papers(저널논문)
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