B.M. Devassy, S.B. Halligudi / Journal of Molecular Catalysis A: Chemical 253 (2006) 8–15
15
zoylation of veratrole and acylation of anisole could be due to the
presence of higher amount of strong Brønsted acid sites. Simi-
larly, the higher activity of 15 SZ-750 catalyst in diphenylether
alkylationincomparisonwith15PZ-750alsocouldbeexplained
based on its higher Brønsted acidity.
[10] F. Marme, G. Coudurier, J.C. V e´ drine, Micropor. Mesopor. Mater. 22
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(
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[
[
[
13] B.M. Devassy, F. Lefebvre, S.B. Halligudi, J. Catal. 231 (2005) 1.
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4
. Conclusions
Zirconia-supported silicotungstic acid (15% STA) catalyst
◦
calcined at 600–850 C were used in benzoylation of veratrole
with benzoic anhydride and the catalyst calcined at 750 C (15
SZ-750) showed the highest activity. For catalysts with support
calcined at different temperatures, catalytic activity decreases
with increase in support calcination temperature. Comparison
of the catalytic activity of 15 SZ-750 with 15% phosphotungstic
[
[
[
[
[
◦
19] S. Loridant, C. Feche, N. Essayem, F. Figueras, J. Phys. Chem. B 109
(2005) 5631.
◦
acid supported on zirconia calcined at 750 C (15 PZ-750) in
20] M. Scheithauer, R.K. Grasselli, H. Kn o¨ zinger, Langmuir 14 (1998)
acylation and alkylation of aromatics showed that 15 SZ-750
catalyst is more active and resistant to deactivation by product
inhibition in acylation reactions. The higher activity and higher
deactivation resistance of 15 SZ-750 catalyst compared to 15
PZ-750 catalyst is due to its higher Brønsted acidity.
3019.
[
[
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3
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Acknowledgements
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This work was carried under DST-SERC project. BMD
acknowledges CSIR New Delhi (India) for the award of
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