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Friedel–Crafts acylation of anisole over hybrid zeolitic-mesostructured materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
42521 45929 2009 10 PDF Available
Title
Friedel–Crafts acylation of anisole over hybrid zeolitic-mesostructured materials
Abstract

The application of hybrid zeolitic-mesostructured materials (HZM) as catalysts in Friedel–Crafts acylation has been investigated and compared with the behaviour of standard ordered mesoporous Al-MCM-41 and nanocrystalline ZSM-5 samples. Hybrid zeolitic-mesoporous samples were prepared from zeolite seeds obtained in different stages of ZSM-5 crystallization by assembling around cetyltrimethyl ammonium bromide (CTAB) micelles to obtain materials having a combination of both zeolitic and mesostructured properties. Acylation of anisole with acetyl chloride and acetic anhydride has been investigated over this type of catalysts, the highest conversions being obtained in all cases with the former acylating agent. The activity of the hybrid materials (HZM) was found to be remarkably higher than those exhibited by Al-MCM-41 and ZSM-5 materials, which has been interpreted as a convenient combination of accessibility and zeolitic features in the former. Deactivation, re-use and regenerability of the HZM material were also investigated. With all catalysts, a decline of activity was observed along the reaction time denoted by the fact that the conversion reaches a plateau. This deactivation is caused mainly by product inhibition associated to the strong adsorption of p-MAP on the acid sites. Nevertheless, the hybrid catalysts could be regenerated by calcination and further re-used efficiently for the anisole acylation.

Graphical abstractWith this study we want to deep on the application of hybrid zeolitic-mesostructured materials (HZM) as catalysts in Friedel–Crafts acylation and compared with the behaviour of standard ordered mesoporous Al-MCM-41 and nanocrystalline ZSM-5 samples. The activity of the hybrid materials (HZM) was found to be remarkably higher than those exhibited by Al-MCM-41 and ZSM-5 materials, which has been interpreted as a convenient combination of accessibility and acid strength, as consequence of the likely incorporation of zeolitic entities within the mesopore walls of these hybrid materials.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Anisole acylation; Mesostructured zeolitic materials; Al-MCM-41; ZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 359, Issues 1–2, 15 May 2009, Pages 69–78
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