Abstract
Hydrogenation of 1,3-butadiene has been performed on Pt(100) and Pt(100). The kinetics results may be explained by a consecutive scheme where the butenes are the primary products as has been generally proposed on more conventional supported metal catalysts. The Pt(110) is the most active and the most selective of the low-index faces of platinum. On Pt(100), the influence of K and Na additives on the activity and the selectivity for 1,3-butadiene hydrogenation has been determined. About the same effect has been observed for potassium and sodium. Up to a coverage of less than 0.4 monolayer, alkali additives improve both the activity and the selectivity. This may be understood in terms of changes in electron donation or backdonation induced by the alkali adsorbate on the chemisorbed species leading to a lowering of the bond strength of the unsaturated hydrocarbons with the metal surface atoms. For higher coverages, the geometrical blocking effect dominates.
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