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Abstract
Bifunctional platinum over tungsten oxide promoted zirconia (Pt/WZ) and platinum over sulfate promoted zirconia (Pt/SZ) were characterized by XRD, Sg, ICP-OES, DRIFTS and test reactions: cyclohexane dehydrogenation (metallic function) and n-pentane isomerization (acid function). Both reactions were carried out at 300 °C, atmospheric pressure and in the presence of hydrogen. Benzene and methylcyclopentane were obtained in the cyclohexane reaction and iso-pentane was the main product during n-pentane reaction. The poisoning with carbon disulfide (CS 2) and n-butylamine (BA) of the two reactions, were measured. Pt/WZ and Pt/SZ were sensitive to both poisons used. CS 2 affects directly the activity of the metal function and indirectly the one of the acid function because decreases the hydrogen dissociation capacity of Pt. BA only affects the acid function.
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