Abstract
Bimetallic supported Pt-W catalysts are studied for 3-methylhexane reforming. An increase in the activity and selectivity in aromatization is found for Pt-low W/Al2O3 catalysts compared to the classical monometallic Pt/Al2O3 catalyst. Changes in activity and selectivity, for bimetallic catalysts, are attributed to “tungsten moderator interaction” effects between platinum and support which modify the metallic particle sizes. These changes are observed on Pt-high W/Al2O3 and Pt-W/SiO2 catalysts. Superficial carbide formation and modification of the hydrogen chemisorption may be proposed to explain the reactivity of Pt-W catalysts under low hydrogen pressure.
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