CHARACTERIZATION AND CATALYTIC PROPERTIES OF PT-IR SMALL BIMETALLIC CLUSTER IN NAY

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The formation of small Pt-Ir bimetallic clusters (about 1 nm) by the reducton of Pt and Ir co-ion-exchanged NaY with H-2 at 300-degrees-C after calcined with oxygen at 300-degrees-C was evidenced by temperature programmed oxidation/reduction (TPO/R), Xe-129 NMR, hydrogen chemisorption and catalytic probe reaction. These small Pt-Ir bimetallic clusters inside the supercage were more stable than Ir monometallic cluster and remained inside the supercage after re-oxidation treatment below 400-degrees-C. Temperature programmed oxidation/reduction (TPO/R) results suggested that the interaction between Pt and Ir takes place in the calcination step prior to hydrogen reduction. The Pt-Ir/NaY bimetallic catalyst showed a higher activity and better activity maintenance than those of Pt/NaY catalyst in n-heptane reforming reaction.
Publisher
ELSEVIER SCIENCE BV
Issue Date
1993
Language
English
Article Type
Article
Keywords

XE-129 NMR TECHNIQUE; ZEOLITES

Citation

STUDIES IN SURFACE SCIENCE AND CATALYSIS, v.75, pp.671 - 680

ISSN
0167-2991
URI
http://hdl.handle.net/10203/197738
Appears in Collection
CBE-Journal Papers(저널논문)
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