Friedel–Crafts acylation of anisole over Cr-doped Hβ zeolite

Friedel–Crafts acylation of anisole over Cr-doped Hβ zeolite Cr-doped Hβ zeolite is found to have better catalytic performance than Hβ zeolite in the Friedel–Crafts acylation of anisole, with acetic anhydride conversion of over 99% and nearly 100% selectivity to furnish para-methoxyacetophenone under the optimized reaction conditions. This is attributed to the increase of weak and moderately strong acid sites, caused by the Cr addition. The formation of carbonaceous materials and their coating of the acid sites are believed to be the reasons for the deactivation of the reused Cr-doped Hβ zeolite, as indicated by the Brunauer−Emmett−Teller (BET) method, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and NH3 temperature-programmed desorption (NH3-TPD) measurement results. The catalyst activity can be recovered by a subsequent calcination. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Friedel–Crafts acylation of anisole over Cr-doped Hβ zeolite

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Publisher
Springer Netherlands
Copyright
Copyright © 2010 by Springer Science+Business Media B.V.
Subject
Chemistry; Inorganic Chemistry ; Physical Chemistry ; Catalysis
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-010-0158-x
Publisher site
See Article on Publisher Site

Abstract

Cr-doped Hβ zeolite is found to have better catalytic performance than Hβ zeolite in the Friedel–Crafts acylation of anisole, with acetic anhydride conversion of over 99% and nearly 100% selectivity to furnish para-methoxyacetophenone under the optimized reaction conditions. This is attributed to the increase of weak and moderately strong acid sites, caused by the Cr addition. The formation of carbonaceous materials and their coating of the acid sites are believed to be the reasons for the deactivation of the reused Cr-doped Hβ zeolite, as indicated by the Brunauer−Emmett−Teller (BET) method, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and NH3 temperature-programmed desorption (NH3-TPD) measurement results. The catalyst activity can be recovered by a subsequent calcination.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Aug 17, 2010

References

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