Microcalorimetric study of the acid-base properties of bulk and silica or γ-alumina-supported vanadium oxides |
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| Authors: | J Le Bars A Auroux |
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| Institution: | (1) Institut de Recherches sur la catalyse, 2 avenue albert einstein, F-69626 Villeurbane, Cédex, France |
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| Abstract: | The acid-base character of vanadium pentoxide, V2O5/SiO2 and V2O5/γ-Al2O3 catalysts has been investigated by adsorption of ammonia and sulphur dioxide using microcalorimetry. By depositing vanadium oxide on silica; new surface sites are formed which present more acid strength than bulk vanadium pentoxide and pure silica. Alumina-supported vanadium catalysts can be regarded as acidic monolayers VOx. Sulphur dioxide was found to be selective for uncovered alumina. |
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| Keywords: | adsorption microcalorimetry catalyst surface vanadium oxides |
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