(570v) Structure of Flame-Made Vanadia/Silica and Catalytic Behavior in the Oxidative Dehydrogenation of Propane
AIChE Annual Meeting
2010
2010 Annual Meeting
Catalysis and Reaction Engineering Division
Poster Session of CRE Division
Wednesday, November 10, 2010 - 6:00pm to 8:00pm
Catalyst based on supported vanadia showed
promising results for the ODH reaction. Here vanadia/silica particles with a specific
surface area up to 330 m2g-1 and a V2O5
content up to 50 wt.% or V surface density up to 27.6 V nm-2
were prepared by flame-spray-pyrolysis. Selected samples were tested for the
ODH of propane. The as-prepared flame-made catalysts showed dominantly isolated
monomeric VOx surface species for V-loadings exceeding even the
typical ?monolayer coverage? (2 V nm-2) of classic
wet-impregnated materials as confirmed by Raman and NMR analysis. The turnoverfrequency
of flame-made catalysts decreased with increasing vanadia loading while the
presence of small V2O5 crystallites seemed to be less critical.
The conversion (global activity), however, showed a maximum for the 20 wt.%
V2O5/SiO2 (4.6 V nm-2)
catalyst. Catalysts consisting dominantly of isolated monomeric VOx-species
exhibited higher selectivity to propylene than those where crystalline V2O5
prevailed. Nevertheless, the highest propylene yield was measured for catalysts
with high V surface density containing both monomeric VOx and
crystalline V2O5. Flame-spray-pyrolysis proved to be a
very versatile method for synthesis of V2O5/SiO2
catalysts with high dispersion and well defined structure of the active sites.
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