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Role of transalkylation reactions in the conversion of anisole over HZSM-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
42183 45913 2010 10 PDF Available
Title
Role of transalkylation reactions in the conversion of anisole over HZSM-5
Abstract

Conversion of anisole, a typical component of bio-oil, was studied over an HZSM-5 zeolite at varying space times (W/F), reaction temperatures, type of carrier gas, and concentration of water in the feed. Several bimolecular and unimolecular reactions are proposed to explain the evolution of products observed. The bimolecular reactions include the following transalkylation reactions: (a) anisoles to phenol and methylanisole; (b) phenol and methylanisole to cresols; (c) phenol and anisole to cresol and phenol; (d) methylanisole and cresol to phenol and xylenol. A pseudo first-order kinetic model based on these bimolecular reactions was found to describe well the observed product distribution as a function of W/F. It is observed that shape selectivity effects prevail over electrophilic substitution and thermodynamic equilibrium effects in the formation of methylanisole isomers. However, the opposite is true for the distribution of cresol isomers. The kinetic analysis indicates that the contribution of unimolecular reactions such as isomerization is much lower than that of bimolecular reactions. The carrier gas composition was found to have a moderate effect on catalyst activity. When H2 was used as a carrier, catalyst stability showed a moderate improvement in comparison to the runs under He. However, a remarkable increase in catalytic activity was observed upon the addition of water in the feed.

Graphical abstractAnisole (methoxybenzene), a model compound of methoxy group containing phenolics in bio-oil, has been studied with varying space time, reaction temperature, type of carrier gas, water addition, and coke analysis over HZSM-5. Kinetic study reveals that bimolecular transalkylation reactions are the major reactions over HZSM-5, while unimolecular isomerization reactions are the minor ones.Figure optionsDownload full-size imageDownload high-quality image (121 K)Download as PowerPoint slide

Keywords
Anisole; Phenolic compounds; HZSM-5; Methoxy group; Biomass conversion; Bio-oil upgrading
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Role of transalkylation reactions in the conversion of anisole over HZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 379, Issues 1–2, 15 May 2010, Pages 172–181
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
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Full-text PDF Download
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