Influence of acidity in friedel-crafts acylation catalyzed by zeolites

The activity of various cation-exchanged Y-type zeolites is investigated in the acylation of toluene with octanoic acid for which the yield in acylated product is 75% and the selectivity in para isomer 94%. The most efficient catalysts are the rare earth-exchanged zeolites (70% exchange). The follow...

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Bibliographic Details
Published in:Journal of molecular catalysis 1989-03, Vol.50 (2), p.219-229
Main Authors: Gauthier, Catherine, Chiche, Bich, Finiels, Annine, Geneste, Patrick
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The activity of various cation-exchanged Y-type zeolites is investigated in the acylation of toluene with octanoic acid for which the yield in acylated product is 75% and the selectivity in para isomer 94%. The most efficient catalysts are the rare earth-exchanged zeolites (70% exchange). The following order of activity is observed: Cr 3+, Zr 4+ < Mg 2+, Cu 2+, Co 2+ ⪡ H + ⪡ Pr 3+, La 3+, Gd 3+, Yb 3+, Ce 3+. A parallel drawn between the acylation reaction and the cyclohexanol dehydration suggests that the active centers are Brönsted sites. This result is confirmed by the study of the influence of the pretreatment temperature on the catalytic activity.
ISSN:0304-5102
DOI:10.1016/0304-5102(89)85065-5