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When high-area oxidic systems carry surface anionic species (in the present case: stable sulfate groups at the surface of sulfated zirconia catalysts), pyridine adsorption leads to an overestimated and thus partly artefact evaluation of the surface Lewis acidity. IR spectroscopic evidence is presented for the existence of a ligand competition at surface cationic centres (Lewis acid sites) between...
IR spectra of surface species and of CO adsorption at ∼77 and ∼300 K on pure ZrO 2 , sulfated ZrO 2 , sulfated/calcined ZrO 2 have been obtained and related to the catalytic activity of these systems in the isomerization of n-butane. Spectral data indicated that: (i) the catalytic activity, when present, requires the presence of both Brønsted and Lewis surface acidity; (ii)...
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