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New reaction pathways and kinetic parameter estimation for methanol dehydration over modified ZSM-5 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41508 45891 2011 12 PDF Available
Title
New reaction pathways and kinetic parameter estimation for methanol dehydration over modified ZSM-5 catalysts
Abstract

Kinetics of the methanol (MeOH) dehydration has been investigated using two kinds of alkali metal-modified ZSM-5 (mZSM-5) catalysts, which were developed for the purpose of preparing dimethyl ether (DME) from water-containing MeOH. Two intrinsic kinetic mechanisms have been suggested and rigorous reaction rate equations were derived based on a series of reaction experiments in the presence and in the absence of water. In addition to the kinetic parameters, the heats of adsorption of MeOH and water were successfully estimated. The values are in good agreement with those obtained from the previously reported experimental results. According to the reaction pathways of our concern, two adsorbed MeOH molecules on the mZSM-5 simultaneously react with acidic sites to produce the intermediate molecule, which then undergoes the rate-determining step that the intermediate molecule rearranges itself to split into the smaller intermediates for the next step with or without the abstraction of water. In addition, the existence of the crucial intermediate closely related to the rate-determining step was also confirmed through FT-IR spectroscopy.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slideResearch highlights► Kinetic mechanisms on the alkali metal modified ZSM-5 catalysts. ► Simultaneous adsorption and activation of two methanol molecules. ► Presence of the methyl carboxonium ion. ► The kinetic parameters and the heats of adsorption were successfully estimated.

Keywords
Methanol; Dimethyl ether; Kinetics; Mechanism; Parameter estimation
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New reaction pathways and kinetic parameter estimation for methanol dehydration over modified ZSM-5 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 395, Issues 1–2, 15 March 2011, Pages 95–106
Authors
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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