Comparison of Lewis Acidity between Al-MCM-41 Pure Chemicals and Al-MCM-41 Synthesized from Bentonite

• Published in: Bulletin of chemical reaction engineering & catalysis 2019-08, Vol.14 (2), p.358-368
• Main Authors: Ali-Dahmane, Tewfik, Brahmi, Lamia, Hamacha, Rachida, Hacini, Salih, Bengueddach, Abdelkader
• Format: Article
• Language: English
• Subjects: al-mcm-41; algerian bentonite; allylation of benzaldehyde; lewis acid; mesoporous materials
• ISSN: 1978-2993; 1978-2993
• DOI: 10.9767/bcrec.14.2.3367.358-368

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.