CLUSTERING OF PLATINUM ATOMS IN ZEOLITE EMT SUPERCAGE - COMPREHENSIVE PHYSICOCHEMICAL CHARACTERIZATION

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Hexagonal faujasite (EMT) has two types of supercage whereas cubic faujasite (FAU) presents only one type of supercage. Using the same treatment than that for Pt clusters in a cubic faujasite, e.g. Y zeolite, a highly dispersed Pt cluster supported on EMT zeolite was prepared. The size, location and structure of Pt clusters entrapped in EMT was investigated using Xe-129 NMR spectroscopy, xenon adsorption, hydrogen chemisorption, high resolution electron microscopy (HREM) and extended X-ray absorption fine structure (EXAFS). The results suggest that a Pt cluster consisting of 20-30 Pt atoms is formed within the three-windows supercage of EMT. The size of Pt clusters does not depend on the Pt content in EMT, when the Pt/EMT obtained by the ion exchange of Pt(NH3)(4)(2+) is calcined in flowing O-2 at 573 K and subsequently reduced in flowing H-2 at 573 K.
Publisher
ELSEVIER SCIENCE PUBL B V
Issue Date
1994
Language
English
Article Type
Article; Proceedings Paper
Keywords

XE-129 NMR; XENON-ADSORPTION; Y-ZEOLITE; CATALYST; CATION; GROWTH

Citation

ZEOLITES AND RELATED MICROPOROUS MATERIALS: STATE OF THE ART 1994 BOOK SERIES: STUDIES IN SURFACE SCIENCE AND CATALYSIS, v.84, pp.765 - 772

URI
http://hdl.handle.net/10203/226273
Appears in Collection
CH-Journal Papers(저널논문)
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