EPR AND XE-129 NMR-STUDIES OF COPPER-EXCHANGED NAY ZEOLITES

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In side-by-side EPR and Xe-129 NMR studies, the occupancy sites of Cu2+ ions in copper-exchanged NaY zeolites are found to depend on the state of reduction/oxidation cycle, the concentration of Cu2+ ions, the sample temperature, and the adsorbate present in the zeolites. The structural features of Y zeolites in the presence of Xe, He, H-2, and O-2 under various reduction and oxidation conditions are examined carefully by these two spectroscopic techniques. The EPR spectral features of Cu2+ in the presence of O-2 adsorbate vary as a function of temperature. The temperature dependence study allows us to calculate the activation energy of migration of Cu2+ from small cages to supercages, which is found to be 9.7 +/- 0.8 kJ/mol. A model is proposed to explain the spectral changes.
Publisher
AMER CHEMICAL SOC
Issue Date
1995-05
Language
English
Article Type
Article
Keywords

TRANSITION-METAL IONS; Y-TYPE ZEOLITES; ELECTRON-SPIN RESONANCE; REDOX BEHAVIOR; CUPRIC IONS; REDUCTION; FAUJASITE; OXYGEN; PAIRS; XENON

Citation

JOURNAL OF PHYSICAL CHEMISTRY, v.99, no.20, pp.8277 - 8282

ISSN
0022-3654
DOI
10.1021/j100020a061
URI
http://hdl.handle.net/10203/12481
Appears in Collection
CH-Journal Papers(저널논문)
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