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Comparative study of zeolite catalyzed alkylation of benzene with alcohols of different chain length: H-ZSM-5 versus mordenite

Paper ID Volume ID Publish Year Pages File Format Full-Text
54893 47030 2013 12 PDF Available
Title
Comparative study of zeolite catalyzed alkylation of benzene with alcohols of different chain length: H-ZSM-5 versus mordenite
Abstract

Alkylation of benzene with light alcohols offers opportunities for a more environmental friendly gasoline by removing considerable portions of benzene. The performances of ZSM-5 and mordenite zeolites as catalysts were tested in the alkylation reaction of benzene with different light alcohols (methanol, ethanol and isopropanol). The experiments were carried out in a fluidized-bed reactor with a 1/1 mol ratio of benzene/alcohol at 200, 250, 300, 350 and 400 °C for 3, 5, 7, 10, 13, 15 and 20 s. The reaction temperature, nature of the alcohol molecule and the BrǾnsted to Lewis acid ratio of the catalysts, play an important role in the alkylation reactions. For benzene alkylation with methanol to toluene and xylene (XY), both mordenite and ZSM-5 are active and selective catalysts, while for benzene ethylation to ethylbenzene (EB), ZSM-5 exhibits higher EB selectivity than mordenite. Isopropanol presents higher difficulty to be activated as compared with other alcohols at the higher temperature, while the lower temperature favors benzene isopropylation to cumene over both catalysts. By studying the alkylation of benzene with alcohols of different chain length, it has been found that as the alkyl size (i.e. methyl, ethyl, and propyl) increases, the optimum temperature for alkylation reaction decreases.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (125 K)Download as PowerPoint slideHighlights► The effect of alkylating agent in benzene alkylation is reported. ► Nature of alcohol molecule plays a crucial role in alkylation. ► High reaction temperature favors methanol activation.

Keywords
B, benzene; T, toluene; XY, xylene; M, methanol; TMB, trimethylbenzeneBenzene; Alcohols; Alkylation; Zeolites; Kinetic modeling
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Comparative study of zeolite catalyzed alkylation of benzene with alcohols of different chain length: H-ZSM-5 versus mordenite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 204, 15 April 2013, Pages 73–84
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