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Light olefin transformation over ZSM-5 zeolites with different acid strengths – A kinetic model

Paper ID Volume ID Publish Year Pages File Format Full-Text
41951 45905 2010 9 PDF Available
Title
Light olefin transformation over ZSM-5 zeolites with different acid strengths – A kinetic model
Abstract

In this study, we analysed the influence of the acidity of a ZSM-5 catalyst on the catalytic transformation of various short-chain olefins (ethylene, propylene and 1-butene). Four ZMS-5 catalysts with different acid strength distributions were studied at different temperatures and partial pressures. The results were fitted using a kinetic model based on a network mechanism, which details the products by type (olefins, paraffins and aromatics) and number of carbon atoms. Polanyi-type equations, supported on quantum chemical calculations, were used to derive quantitative relations between the ammonia adsorption energy, used as a measure of the acidity of a given acid site, and the energetics of the various steps involved in the reaction. It was observed that, although the qualitative aspects of the reactivity differs from olefin to olefin and according to the catalyst's acidity, the model is able to describe both activity and product distribution for all catalysts, reactants and conditions using a single reaction scheme and a single set of kinetic parameters.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (147 K)Download as PowerPoint slideResearch highlights▶Polanyi-type equations correlate the activity with acid strength distribution. ▶ Ammonia TPD can be used to obtain the acid strength distribution of acid catalysts. ▶ A single kinetic mechanism and set of parameters describe all experiments. ▶This all reactants and all catalysts used.

Keywords
Olefin transformation; Acid catalysis; ZSM-5 zeolite; Kinetic model
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Light olefin transformation over ZSM-5 zeolites with different acid strengths – A kinetic model
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 384, Issues 1–2, 20 August 2010, Pages 177–185
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us