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Shape-selective alkylation and related reactions of mononuclear aromatic hydrocarbons over H-ZSM-5 zeolites modified with lanthanum and cerium oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
44191 46007 2006 10 PDF Available
Title
Shape-selective alkylation and related reactions of mononuclear aromatic hydrocarbons over H-ZSM-5 zeolites modified with lanthanum and cerium oxides
Abstract

The La2O3 and CeO2 modifications of H-ZSM-5 zeolites were examined to improve the shape-selectivity in the alkylation of mononuclear aromatic hydrocarbons and related reactions. The selectivities of p-diethylbenzene (p-DEB) among diethylbenzene isomers were improved without significant loss of catalytic activity by the modification with these oxides in the ethylation of ethylbenzene (EB). The La2O3 modification enhanced the selectivities of p-DEB more effectively than the CeO2 modification. The improvement of the selectivities over these oxides is due to the prevention of the isomerization of p-DEB at external acid sites. The para-selectivity for La2O3-modified H-ZSM-5 zeolites is improved due to “product selectivity” resulting from the preferential diffusion of p-DEB by the adjustment of pore entrance as well as by the deactivation of external acid sites.The enhancement of the formation of less bulky xylene isomer was also observed in the disproportionation of toluene and the isomerization of xylene isomers over La2O3- and CeO2-modified H-ZSM-5 zeolites.

Keywords
H-ZSM-5; La2O3 and CeO2 modification; Deactivation of external acid sites; Para-selectivity; Alkylation
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Shape-selective alkylation and related reactions of mononuclear aromatic hydrocarbons over H-ZSM-5 zeolites modified with lanthanum and cerium oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 299, 17 January 2006, Pages 157–166
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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