ISSN:
1572-879X
Keywords:
Vanadium oxide overlayers
;
thin films
;
support effects
;
dehydrogenation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract EXAFS study clarified the structure of vanadium oxide overlayers on MgO, Al2O3 and SiO2. On MgO, vanadium oxides were present as mixed oxides such as Mg3V2O8. Vanadium oxides were in the form of thin films on Al2O3 regardless of the preparation method. On the other hand, three different structures were present on SiO2; isolated species and crystallites by an impregnation method and thin films by chemical vapor deposition (CVD). The thin films on SiO2 were stable even at 773 K in air. Temperature programmed decomposition of ethanol adsorbed revealed that the dehydrogenation activities were strongly affected by the structure of the overlayers; thin films 〉 crystallites ≫ isolated species.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00772598
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