Abstract
The adsorption of pyridine, formic acid, and acetic acid on MgO, MoO 3 and MoO 3/MgO (Mo:Mg=1:15) samples calcined at 773 K (where no extensive reaction between the two oxides seems to take place) or 1100 K (where the MgMoO 4 species is formed) has been monitored by FT-IR spectroscopy. The adsorption of pyridine indicates the formation of Lewis sites on MgO upon incorporation of molybdena. However, this change in the surface acidity does not modify the adsorption of the two carboxylic acids, which takes place dissociatively, probably because the formation of surface MgMoO 4 still leaves exposed Mg 2+, where adsorption of the carboxylate ions takes place.
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