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Catalytic transformation of methyl benzenes over zeolite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41478 45890 2011 15 PDF Available
Title
Catalytic transformation of methyl benzenes over zeolite catalysts
Abstract

Catalytic transformation of three methyl benzenes (toluene, m-xylene, and 1,2,4-trimethyl benzene) has been investigated over ZSM-5, TNU-9, mordenite and SSZ-33 catalysts in a novel riser simulator at different operating conditions. Catalytic experiments were carried out in the temperature range of 300–400 °C to understand the transformation of these alkyl benzenes over large pore (mordenite and SSZ-33) in contrast to medium-pore (ZSM-5 and TNU-9) zeolite-based catalysts. The effect of reaction conditions on the isomerization to disproportionation product ratio, distribution of trimethylbenzene (TMB) isomers, and p-xylene/o-xylene ratios are reported. The sequence of reactivity of the three alkyl benzenes depends upon the pore structure of zeolites. The zeolite structure controls primarily the diffusion of reactants and products while the acidity of these zeolites is of a secondary importance. In the case of medium pore zeolites, the order of conversion was m-xylene > 1,2,4-TMB > toluene. Over large pore zeolites the order of reactivity was 1,2,4-TMB > m-xylene > toluene for SSZ-33 catalyst, and m-xylene ∼ 1,2,4-TMB > toluene over mordenite. Significant effect of pore size between ZSM-5 and TNU-9 was observed; although TNU-9 is also 3D 10-ring channel system, its slightly larger pores compared with ZSM-5 provide sufficient reaction space to behave like large-pore zeolites in transformation of aromatic hydrocarbons. We have also carried out kinetic studies for these reactions and activation energies for all three reactants over all zeolite catalysts under study have been calculated.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (76 K)Download as PowerPoint slideResearch highlights▶ The effect of structure architecture of novel zeolites SSZ-33 and TNU-9 is reported for toluene, m-xylene and 1,2,3-trimethylbenzene reactions. ▶ We report on the kinetic data of a riser simulator. ▶ The experimental data of catalytic studies are contrasted to the kinetic model for all reactants and catalysts tested.

Keywords
ZSM-5; TNU-9; Mordenite; SSZ-33; Toluene; m-Xylene; 1,2,4-Trimethylbenzene; Disproportionation; Isomerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 176–190
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
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Any Questions? feel free to contact us