Oxidation of Reduced Platinum Clusters in Pt-NaY

Raman spectroscopy and 129Xe NMR, in conjunction with hydrogen chemisorption and transmission electron microscopy, have been used to monitor the location and stability of metal clusters as a function of oxidation conditions for NaY-zeolite-supported platinum. After initial calcination and reduction...

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Bibliographic Details
Published in:Journal of catalysis 1993-12, Vol.144 (2), p.506-524
Main Authors: Chmelka, B.F., Went, G.T., Csencsits, R., Bell, A.T., Petersen, E.E., Radke, C.J.
Format: Article
Language:English
Subjects:
Catalysis
CATALYST SUPPORTS
Catalysts: preparations and properties
CHEMICAL REACTIONS
Chemistry
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
Exact sciences and technology
General and physical chemistry
INORGANIC ION EXCHANGERS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ION EXCHANGE MATERIALS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MAGNETIC RESONANCE
MATERIALS
METALS
MINERALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXIDATION
PLATINUM
PLATINUM METALS
RADIOISOTOPES
RESONANCE
SILICATE MINERALS
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TRANSITION ELEMENTS
XENON 129
XENON ISOTOPES 400201 > Chemical & Physicochemical Properties
ZEOLITES
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Description
Summary:Raman spectroscopy and 129Xe NMR, in conjunction with hydrogen chemisorption and transmission electron microscopy, have been used to monitor the location and stability of metal clusters as a function of oxidation conditions for NaY-zeolite-supported platinum. After initial calcination and reduction of Pt-NaY, subsequent reoxidation at temperatures up to 873 K induces no additional agglomeration of the metal species. Different Pt-NaY systems exhibit cluster-size-dependent responses to reoxidation treatment, consistent with the greater reactivities expected for small metal particles compared to larger aggregates. We present a summary of platinum dispersal chemistry in NaY zeolite based on these and recent corroborative results.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1993.1350