Abstract
The conversion of methylcyclopentane, n-hexane and n-heptane was investigated under normal pressure with unsulfided and presulfided samples of a commercial Pt—Re/Al 2O 3 catalyst. Comparisons of the yields of key products over a wide conversion range enable us to make conclusions about the favoured reaction pathways. In sulfided samples hydrogenation/dehydrogenation sites and platinum sites catalysing the 1,6 ring closure of n-heptane (or its dehydrogenation products) are protected from self-poisoning. The poisoning effect of sulfur itself prevails on metal sites for structure-sensitive reactions (hydrogenolysis, toluene de-methylation). As to the 1,6 ring closure of n-hexane or its dehydrogenation products there is an intermediate situation: sulfidation effects higher benzene yields but lower benzene selectivities.
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