Propane ammoxidation catalyst prepared by thermally induced spreading of Sb2O3 on V/Al/O-mixed oxide

Authors: J. Bilde, P. Delichere, L. Burel, S. Loridant, J.M.M. Millet

Abstract:
Mechanical mixtures of Sb₂O₃ and V/Al/O mixed oxide have been tested as catalysts in the ammoxidation of propane. The results obtained showed that upon addition of Sb₂O₃ the propane conversion rate and the selectivity to acrylonitrile were decreased but to a limited extent whereas a strong decrease in selectivity to COx was observed to the advantage of selectivity to propene. Sb₂O₃ completely reacts with the V/Al/O mixed oxide to form a rutile-type V1−xAlxSbO₄ phase that spreads over the mixed oxide. If the structure modifications have to be taken into account to explain the difference in catalytic properties, the characterization of the catalysts allowed proposing that they primarily result from the contamination of the surface of the active V/Al/O mixed oxide by Sb species. If the changes in catalytic properties evidenced in the study appear rather unproductive in terms of yield in acrylonitrile, they can be of interest if a process integrated a recycling of the reaction feeds was designed for an industrial application. 

Keywords:
Propane ammoxidation
Vanadium–aluminum oxynitride
Antimony oxide
Synergetic effects
Mechanical mixtures

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Propane ammoxidation catalyst prepared by thermally induced spreading of Sb2O3 on V/Al/O-mixed oxide

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