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Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
43608 45979 2007 8 PDF Available
Title
Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol
Abstract

AlMCM-41 mesoporous molecular sieve modified by impregnation with sulphuric acid in toluene possesses only Brönsted acid sites. The catalyst exhibits a high catalytic activity for tert-butylation of phenol with high selectivity to 2,4-di-tert-butylphenol in liquid phase. 27Al MAS NMR study indicates that the modification of AlMCM-41 with sulphuric acid in toluene leaves only octahedrally coordinated Al species. The tetrahedrally coordinated Al species which exist before modification with sulphuric acid in toluene being dealuminated to form extraframework octahedrally coordinated Al species. The mesoporous structure of AlMCM-41 is retained after modification, but pore size decreases by ca. 3 Å by the modification. The active sites are postulated on the basis of XRD, FTIR, 27Al MAS NMR, TGA, BET analysis and FTIR-pyridine adsorption studies that –OSO3H bonded to octahedrally coordinated Al species.

Graphical abstractGeneration of Brönsted acidity in AlMCM-41 has been demonstrated by sulphation method. It was demonstrated that the sulphated AlMCM-41 was catalytically active towards liquid phase tert-butylation of phenol.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Sulphation; AlMCM-41; Brönsted acid; tert-Butylation; Phenol
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Generation of Brönsted acidity in AlMCM-41 by sulphation for enhanced liquid phase tert-butylation of phenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 58–65
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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