Abstract
The conversion of methylcyclopentane was investigated over PtSn Al 2O 3 catalysts containing 1% Pt and 0.06–4% Sn. Addition of tin increases the stability of catalytic activity and induces distinct selectivity changes. When the tin content is increased, hydrogenolysis of methylcyclopentane to hexanes and aromatization to benzene go through a maximum, while dehydrogenation to methylcyclopentenes remains roughly constant. Coke or sulfur deposition give an effect similar to tin addition for hydrogenolysis; the results for this reaction are therefore interpreted by the division of the platinum surface into small ensembles of platinum atoms which cannot hydrogenolyze. At high tin contents, the main reaction is dehydrogenation. Sulfur or coke do not reproduce the results obtained with tin on aromatization. Since this reaction has been proposed to proceed, like dehydrogenation, at a single platinum atom, the inhibition of aromatization by high tin contents is interpreted in terms of an electronic modification of platinum by tin.
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