Reduction and oxidation effects on rhodium species in Na-X zeolite studied by electron spin echo and electron spin resonance spectroscopies
Journal Article
·
· J. Phys. Chem.; (United States)
Reduction and oxidation of Rh-exchanged Na-X zeolite activated in flowing oxygen generated several new paramagnetic Rh(II) species which differ in symmetry and location from the Rh(II) species formed after activation only. The various new species were characterized by electron spin resonance (ESR) and electron spin echo modulation (ESEM) experiments. Reduction of samples, activated at 240-400/sup 0/C, with H/sub 2/ generated a species designated as H1 which has an isotropic g tensor at 77 K and shows a dynamic Jahn-Teller effect. A different species, H2, was formed after reducing samples which were activated at 400-500/sup 0/C. In both cases the ESR signals of the original Rh(II) species formed after activation disappeared after the reduction. On the other hand, oxidation of activated samples by molecular oxygen did not affect any of the original paramagnetic Rh(II) species but produced several additional paramagnetic species. These species did not interact with benzene or ethylene whereas they did respond to the adsorption of water, methanol, or ammonia. 24 references, 16 figures, 2 tables.
- Research Organization:
- Univ. of Houston, TX
- OSTI ID:
- 5699037
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:10; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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· J. Phys. Chem.; (United States)
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ACOUSTIC ESR
ALKALI METALS
CATALYSTS
CHEMICAL REACTIONS
COMPLEXES
DATA
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
GYROMAGNETIC RATIO
HIGH TEMPERATURE
HYDROGEN
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LOW TEMPERATURE
MAGNETIC RESONANCE
MATERIALS
MEDIUM TEMPERATURE
METALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDATION
REACTION INTERMEDIATES
REDUCTION
RESONANCE
RHODIUM COMPLEXES
SODIUM
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TENSORS
TRANSITION ELEMENT COMPLEXES
ZEOLITES
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ACOUSTIC ESR
ALKALI METALS
CATALYSTS
CHEMICAL REACTIONS
COMPLEXES
DATA
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
GYROMAGNETIC RATIO
HIGH TEMPERATURE
HYDROGEN
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LOW TEMPERATURE
MAGNETIC RESONANCE
MATERIALS
MEDIUM TEMPERATURE
METALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDATION
REACTION INTERMEDIATES
REDUCTION
RESONANCE
RHODIUM COMPLEXES
SODIUM
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TENSORS
TRANSITION ELEMENT COMPLEXES
ZEOLITES