Resumo

MURGIA, V.; SHAM, E.; GOTTIFREDI, J. C.  e  FARFAN TORRES, E. M.. Oxidative dehydrogenation of propane and n-butane over aluminia supported vanadium catalysts. Lat. Am. appl. res. [online]. 2004, vol.34, n.2, pp.75-82. ISSN 0327-0793.

Structural properties of vanadium dispersed species on g-A1203 are investigated with the scope to detect changes related with V loading in the oxidative dehydrogenation (ODH) of propane and nbutane. XPS, FTIR, and FTIR of absorbed pyridine were used to study the nature of vanadium supported species. Tetrahedral V5+ and probably V4+ species were detected. For vanadium loadings higher than 4.3 % wt octahedral species were also observed. In the n-butane ODH reaction, the selectivity to ODH products decreases when vanadium content increases. However, for propane ODH, the selectivity seems to be independent of vanadium loadings. Low oxygen/alkane feeding ratios favor selectivity to olefins. It is also shown that low V loading catalysts reach selectivities as good as best reported V-Mg-O catalyst.

Palavras-chave : Oxidative Dehydrogenation; Vanadium Catalysts; propane; n-butane.

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