Comparison of Lewis Acidity between Al-MCM-41 Pure Chemicals and Al-MCM-41 Synthesized from Bentonite
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Published:2019-08-01
Issue:2
Volume:14
Page:358
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ISSN:1978-2993
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Container-title:Bulletin of Chemical Reaction Engineering & Catalysis
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language:
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Short-container-title:Bull. Chem. React. Eng. Catal.
Author:
Ali-Dahmane Tewfik,Brahmi Lamia,Hamacha Rachida,Hacini Salih,Bengueddach Abdelkader
Abstract
This study focused on the Lewis acidity of Al-MCM-41 prepared from bentonite (Al-MCM-bentonite) as silica and aluminum source simultaneously. This acidity was compared with Al-MCM-41 synthesized from pure chemicals reagents (Al-MCM-standard). Structural analysis showed that the substitution of the silicon atom by the aluminum atom decreases the structural order of Al-MCM-standard, whereas Al-MCM-bentonite has a better structural organization. The Lewis acidity of the Al-MCM-bentonite was evaluated in allylation reaction of benzaldehyde with allyltrimethylsilane and pyridine adsorption experiments. The results showed that the difference in acidity between Al-MCM-standard and Al-MCM-bentonite is due to the amount of aluminum incorporated into the framework of our mesoporous materials. According to the EDX analysis, the incorporation of aluminum in Al-MCM-standard (Si/Al = 13.47) is more important than in Al-MCM-bentonite (Si/Al = 43.64). This explains the low acidity of Al-MCM-bentonite, and the moderate yields in the allylation reactions of benzaldehyde with allyltrimethylsilane. Copyright © 2019 BCREC Group. All rights reserved
Publisher
Bulletin of Chemical Reaction Engineering and Catalysis
Subject
Process Chemistry and Technology,Catalysis
Cited by
3 articles.
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