Supported transition metal compounds: Infrared studies on the acidity of Co/ZSM-5 and Fe/ZSM-5 catalysts

The acidity of Fe/ZSM-5 and Co/ZSM-5 synthesis gas conversion catalysts, prepared by extraction of Fe 3(CO) 12 and Co 2(CO) 8, is investigated by infrared characterization of chemisorbed pyridine. A portion of the total concentration of iron or cobalt is shown to incorporate into the channels of the...

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Bibliographic Details
Published in:Zeolites 1983, Vol.3 (4), p.337-343
Main Authors: Rhee, Kee H., Udaya, V., Rao, S., Stencel, John M., Melson, Gordon A., Crawford, Janet E.
Format: Article
Language:English
Subjects:
acidity
Catalysis
Catalysts: preparations and properties
Catalytic reactions
characterization
Chemistry
Exact sciences and technology
General and physical chemistry
General. Nomenclature, chemical documentation, computer chemistry
i.r. spectroscopy
ion-exchange
metal carbonyls
Theory of reactions, general kinetics
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
ZSM-5
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Summary:The acidity of Fe/ZSM-5 and Co/ZSM-5 synthesis gas conversion catalysts, prepared by extraction of Fe 3(CO) 12 and Co 2(CO) 8, is investigated by infrared characterization of chemisorbed pyridine. A portion of the total concentration of iron or cobalt is shown to incorporate into the channels of the ZSM-5. Such incorporation involves ion-exchange during Co 2(CO) 8 extraction onto ZSM-5 but occurs only upon H 2 reduction of Fe/ZSM-5 subsequent to Fe 3(CO) 12 extraction. The ion-exchange causes a redistribution of the Bronsted and Lewis acidity of the ZSM-5. As a result of this redistribution, the oxidation state of the ion-exchanged iron is calculated.
ISSN:0144-2449
1873-3115
DOI:10.1016/0144-2449(83)90179-3