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Correlation of the cracking activity with solid acidity and adsorption property on zeolites

Paper ID Volume ID Publish Year Pages File Format Full-Text
42244 45916 2010 6 PDF Available
Title
Correlation of the cracking activity with solid acidity and adsorption property on zeolites
Abstract

Activities for catalytic cracking of octane and hexane were measured on various zeolites, and the dependence of the turnover frequency and the activation energy on the characterization parameters was studied. The heats of ammonia and alkanes adsorption were measured to be correlated with the catalytic activities. From the relations between the heats of alkane and ammonia adsorption, zeolites were divided into two Groups I and II. In the zeolites of Group I on which a close relation between heats of alkane and ammonia adsorptions was observed, a compensation relation between the heat of alkane adsorption and activation energy was observed, but the so-called constant intrinsic activation energy was not confirmed. In the zeolites of Group II on which the relation between the heats of adsorption was not observed, the compensation relation did not exist. Thus, the dependence of the cracking activity upon characterization parameters was summarized: i.e., the heat of alkane adsorption cannot be utilized as a parameter to elucidate the activities of a few zeolites in Group II: on the other hand, the heat of ammonia adsorption can be totally correlated with these activities. Thus, the prevailing role of the solid acidity in the alkane cracking is proven. Finally, the cracking activity is discussed based on the solid acidity.

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Keywords
Zeolite; Alkane cracking; Brønsted acidity; Strength; Adsorption heat; Cracking; Octane; Hexane; Ammonia infrared/mass spectroscopy temperature programmed-desorption; Activation energy; Heat of alkane adsorption
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Correlation of the cracking activity with solid acidity and adsorption property on zeolites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 373, Issues 1–2, 31 January 2010, Pages 208–213
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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