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

• 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
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1006/jcat.1993.1192

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.