On the Compensation Effect in Acid-Base Catalyzed Reactions on Zeolites

Kinetic data for a number of acid-base catalyzed reactions carried out over a number of faujasite-type zeolites have been collected and analyzed. The nature and number of active sites has been changed by catalyst treatment and characterized, and the enthalpy and entropy of activation, activation ene...

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Bibliographic Details
Published in:Journal of catalysis 1993-07, Vol.142 (1), p.97-109
Main Authors: Corma, A., Llopis, F., Monton, J.B., Weller, S.
Format: Article
Language:English
Subjects:
400201 - Chemical & Physicochemical Properties
ACTIVATION ENERGY
ARRHENIUS EQUATION
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
Catalytic reactions
CHEMICAL REACTION KINETICS
Chemistry
ENERGY
ENTHALPY
ENTROPY
EQUATIONS
Exact sciences and technology
FAUJASITE
General and physical chemistry
HETEROGENEOUS CATALYSIS
INORGANIC ION EXCHANGERS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
MINERALS
PHYSICAL PROPERTIES
REACTION KINETICS
SILICATE MINERALS
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
THERMODYNAMIC PROPERTIES
ZEOLITES
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Description
Summary:Kinetic data for a number of acid-base catalyzed reactions carried out over a number of faujasite-type zeolites have been collected and analyzed. The nature and number of active sites has been changed by catalyst treatment and characterized, and the enthalpy and entropy of activation, activation energy, and pre-exponential factor have been determined. The results have been used to examine whether a compensation effect exists in each case and, if so, to obtain the corresponding isokinetic parameters. In addition, the results of kinetics studies reported by other authors have been analyzed in a similar way. In all zeolite-catalyzed reactions studied, a compensation effect is shown to exist. The effect is interpreted essentially as a consequence of the heterogeneity of the acidic or basic sites.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1993.1192