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Acidity and catalytic properties for the alkylation of aromatics of PILCs with mixed oxide pillars prepared from two different bentonites

Paper ID Volume ID Publish Year Pages File Format Full-Text
44264 46011 2006 6 PDF Available
Title
Acidity and catalytic properties for the alkylation of aromatics of PILCs with mixed oxide pillars prepared from two different bentonites
Abstract

A purified natural clay and the material obtained by acid treatment with sulphuric acid have been pillared with mixed solutions containing Al and Fe, Ti or Cr. The intercalation gives solids of high surface area, stable up to 773 K. The acid properties have been determined by calorimetric adsorption of ammonia. Several parameters determine the acidity of the pillared samples: the temperature of calcinations, the nature of the pillars and the type of clay. The distribution of acid strengths measured on these clays is comparable to that of zeolites, the AlTi clays showing the highest acidity. The catalytic properties have been determined for the alkylation of aromatics by benzylchloride. In spite of their lower acidity, the most active clays are those containing Fe. The same phenomenon is observed with benzene, chlorobenzene, or anisole as substrate. This lack of correlation of activity for alkylation and acidity is attributed to the initiation of the reaction by the oxidation of benzylchloride by Fe3+.

Keywords
Pillared clays; Acidity; Calorimetry; Alkylation of aromatics; Benzylchloride; Mixed pillars; AlFe-PILC; AlTi-PILC; AlCr-PILC
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Acidity and catalytic properties for the alkylation of aromatics of PILCs with mixed oxide pillars prepared from two different bentonites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 298, 10 January 2006, Pages 188–193
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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