A XE-129 NMR SPECTROSCOPIC TECHNIQUE TO PROBE EXCLUSIVELY THE INTERNAL SURFACE OF ZEOLITE CRYSTALLITES BY COATING OF THE EXTERNAL SURFACE

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A NaY + CaY or NaY + Pt/NaY powder zeolite mixture was soaked with liquid octamethylcyclotetrasiloxane (OMTS) in situ under an atmosphere of xenon. The OMTS coating on the zeolite crystallites blocked the intercrystal diffusion of xenon very effectively at room temperature; while it did not affect the interior of the zeolite matrix. Xe-129 NMR spectra of the two mixtures complexed with OMTS showed two distinct signals corresponding to the different components in the respective mixtures. The application of the Xe-129 NMR spectroscopic technique using OMTS to Pt/NaY and Ni/NaY samples distinguished the chemical shifts due to the xenon interaction with the metal clusters located inside the zeolite matrix from those on the external surface.
Publisher
AMER CHEMICAL SOC
Issue Date
1994-07
Language
English
Article Type
Letter
Keywords

Y-ZEOLITE; XENON

Citation

JOURNAL OF PHYSICAL CHEMISTRY, v.98, no.29, pp.7101 - 7103

ISSN
0022-3654
DOI
10.1021/j100080a001
URI
http://hdl.handle.net/10203/12560
Appears in Collection
CH-Journal Papers(저널논문)
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