Vapour phase oxidation of 4-methylanisole to anisaldehyde over V2O5 /MgO-Al2O3 catalysts

Vapour phase oxidation of 4-methylanisole to anisaldehyde over V2O5 /MgO-Al2O3 catalysts The vapour phase selective oxidation of 4-methylanisole to anisaldehyde was investigated over different V2O5 /MgO-Al2O3 catalysts at 673 K and normal atmospheric pressure. Among various catalysts investigated the 16 wt% V2O5 /MgO-Al2O3 catalyst provided good conversion and product selectivity. The MgO-Al2O3 mixed oxide was obtained by a co-precipitation method and V2O5 was impregnated from ammonium metavanadate. The MgO-Al2O3 support and various V2O5 /MgO-Al2O3 catalysts were characterized by means of X-ray diffraction, FT-infrared, electron spin resonance, scanning electron microscopy, ammonia and carbon dioxide chemisorption methods. The characterization results suggest that vanadia does not form layer structures on the support surface, instead interacts very strongly with the support, in particular with MgO, and forms amorphous compounds. The NH3 and CO2 uptake results provide an interesting information on the acid-base characteristics of these catalysts and correlate with their catalytic properties. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Vapour phase oxidation of 4-methylanisole to anisaldehyde over V2O5 /MgO-Al2O3 catalysts

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Publisher
Springer Journals
Copyright
Copyright © 2001 by VSP 2001
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856701300356446
Publisher site
See Article on Publisher Site

Abstract

The vapour phase selective oxidation of 4-methylanisole to anisaldehyde was investigated over different V2O5 /MgO-Al2O3 catalysts at 673 K and normal atmospheric pressure. Among various catalysts investigated the 16 wt% V2O5 /MgO-Al2O3 catalyst provided good conversion and product selectivity. The MgO-Al2O3 mixed oxide was obtained by a co-precipitation method and V2O5 was impregnated from ammonium metavanadate. The MgO-Al2O3 support and various V2O5 /MgO-Al2O3 catalysts were characterized by means of X-ray diffraction, FT-infrared, electron spin resonance, scanning electron microscopy, ammonia and carbon dioxide chemisorption methods. The characterization results suggest that vanadia does not form layer structures on the support surface, instead interacts very strongly with the support, in particular with MgO, and forms amorphous compounds. The NH3 and CO2 uptake results provide an interesting information on the acid-base characteristics of these catalysts and correlate with their catalytic properties.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Oct 13, 2004

References

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