mong the various catalysts proposed for the oxidative dehydrogenation (ODH) of propane, mixed oxide catalysts containing vanadium are the most frequently studied. A study on the optimization of the hydrolytic sol-gel preparation method to achieve the highest possible control of the molecular scale interdispersion of the mixed-oxide phases was carried out. A Nb-V synergistic effect in the ODH of propane characterized the 4.5:1 Nb/V sample, which showed both higher activity and selectivity to propylene than the 1:1 Nb/V samples. The 9:1 Nb/V sample containing the lowest amount of V behaved similarly to pure Nb2O5, showing rather poor activity and high selectivity to propylene, about 50%. Both activity and selectivity increased only slightly with the 1:1 Nb/V (citric acid) system, containing V mainly as Nb-V mixed oxide. The presence of small amount of V-O-V bonds as crystalline V2O5 increased significantly the catalyst activity of precipitated 1:1 Nb/V samples. This is an abstract of a paper presented at the International Workshop on Oxide Based Materials: New sources, novel phases, new applications.

Vanadium and niobium mixed-oxide catalysts obtained via sol-gel: preparation and catalytic behaviour in oxidative dehydrogenation of propane

Lucarelli, C.;
2005-01-01

Abstract

mong the various catalysts proposed for the oxidative dehydrogenation (ODH) of propane, mixed oxide catalysts containing vanadium are the most frequently studied. A study on the optimization of the hydrolytic sol-gel preparation method to achieve the highest possible control of the molecular scale interdispersion of the mixed-oxide phases was carried out. A Nb-V synergistic effect in the ODH of propane characterized the 4.5:1 Nb/V sample, which showed both higher activity and selectivity to propylene than the 1:1 Nb/V samples. The 9:1 Nb/V sample containing the lowest amount of V behaved similarly to pure Nb2O5, showing rather poor activity and high selectivity to propylene, about 50%. Both activity and selectivity increased only slightly with the 1:1 Nb/V (citric acid) system, containing V mainly as Nb-V mixed oxide. The presence of small amount of V-O-V bonds as crystalline V2O5 increased significantly the catalyst activity of precipitated 1:1 Nb/V samples. This is an abstract of a paper presented at the International Workshop on Oxide Based Materials: New sources, novel phases, new applications.
2005
International Workshop on Oxide Based Materials: New sources, novel phases, new applications
978-044451975-7
International Workshop on Oxide Based Materials: New sources, novel phases, new applications
Como; Italy;
13 September 2004 through 16 September 2004
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1938520
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