TEM, EXAFS, FTIR, temporal anal. of products, stopped-flow desorption, and catalytic measurements of (VO)2P2O7 are reported. The reduced interaction between (020) planes of (VO)2P2O7 in samples prepd. in an org. medium induces a charge localization on the V atoms of the coupled trans-vanadyl present in this plane, enhancing their catalytic reactivity in butane oxidn. Contiguous surface Broensted sites (P-OH) also participate in the mechanism of selective oxidn. C-contg. residues are present in relevant amt. on the surface during catalytic expts. and give rise to a specific fouling of the active sites, but their possible role as co-catalysts in the transfer mechanisms of single activated species is also discussed. [on SciFinder(R)]
Nature of active species of vanadyl pyrophosphate for selective oxidation of butane to maleic anhydride
CENTI, Gabriele;
1989-01-01
Abstract
TEM, EXAFS, FTIR, temporal anal. of products, stopped-flow desorption, and catalytic measurements of (VO)2P2O7 are reported. The reduced interaction between (020) planes of (VO)2P2O7 in samples prepd. in an org. medium induces a charge localization on the V atoms of the coupled trans-vanadyl present in this plane, enhancing their catalytic reactivity in butane oxidn. Contiguous surface Broensted sites (P-OH) also participate in the mechanism of selective oxidn. C-contg. residues are present in relevant amt. on the surface during catalytic expts. and give rise to a specific fouling of the active sites, but their possible role as co-catalysts in the transfer mechanisms of single activated species is also discussed. [on SciFinder(R)]Pubblicazioni consigliate
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