Oxidative Dehydrogenation of Ethylbenzene over Sm2O3–V2O5 System

Sm2O3/V2O5 catalysts were synthesized by wet impregnation of samaria with an aqueous solution of ammonium trioxovanadate(V). The characterization of the prepared samples was carried out using EDX, XRD, FTIR and TG-DTA as well as a measurement of the surface area and pore volume. The catalysts were f...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2002-03, Vol.75 (3), p.463-471
Main Authors: Sugunan, Sankaran, Renuka, Neeroli Kizhakayil
Format: Article
Language:English
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Summary:Sm2O3/V2O5 catalysts were synthesized by wet impregnation of samaria with an aqueous solution of ammonium trioxovanadate(V). The characterization of the prepared samples was carried out using EDX, XRD, FTIR and TG-DTA as well as a measurement of the surface area and pore volume. The catalysts were found to be stable up to 800 °C. Both amorphous and crystalline vanadate species were detected in the supported system. Vanadia species became anchored to the surface through an interaction with basic hydroxy groups and Lewis acid sites of the surface. Lewis acid and base sites decreased upon vanadia addition along with a concomitant enhancement of Brønsted acid sites. The oxidative dehydrogenation of ethylbenzene was carried out over Sm/V catalysts, which exhibited a styrene selectivity > 80%. The active species present in the supported system was concluded to be amorphous vanadia in tetrahedral coordination. The higher vanadia-loaded systems exhibited constant styrene selectivity, where crystalline tetraoxovanadates were predominantly formed.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.75.463