V-Ti oxide catalysts prepd. by different methods (flash drying, copptn., wet impregnation, grafting) were investigated. Three V species are present in addn. to cryst. V2O5 (found at coverages higher than the theor. monolayer): VIV and VV strongly interacting with the Ti surface and a weakly interacting VV species. The prepn. procedure strongly influences the relative ratio of these 3 V species. Prepns. in which an oxo-hydrated Ti gel is involved instead of preformed TiO2 give rise to the formation of a greater amt. of strongly interacting V species. A comparison of catalytic properties in ortho-xylene selective oxidn. suggests that all these species are involved in the mechanism of oxidn.; in particular, VIV in the activation stage and VV in the selective step. [on SciFinder(R)]

Preparation chemistry of vanadium-titanium-oxygen mixed oxides. Comparison of coprecipitation, grafting and impregnation methods

CENTI, Gabriele;
1987-01-01

Abstract

V-Ti oxide catalysts prepd. by different methods (flash drying, copptn., wet impregnation, grafting) were investigated. Three V species are present in addn. to cryst. V2O5 (found at coverages higher than the theor. monolayer): VIV and VV strongly interacting with the Ti surface and a weakly interacting VV species. The prepn. procedure strongly influences the relative ratio of these 3 V species. Prepns. in which an oxo-hydrated Ti gel is involved instead of preformed TiO2 give rise to the formation of a greater amt. of strongly interacting V species. A comparison of catalytic properties in ortho-xylene selective oxidn. suggests that all these species are involved in the mechanism of oxidn.; in particular, VIV in the activation stage and VV in the selective step. [on SciFinder(R)]
1987
978-0-444-42796-0
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/1907362
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 22
  • ???jsp.display-item.citation.isi??? ND
social impact