Abstract
The properties of the catalyst (Pt + Pr)/SiO2 prepared by decomposition of anchored complexes of Pr and Pt differ from those of Pt/SiO 2 by (1) an increase in the dispersion and thermal stability of platinum, (2) a positive shift of the binding energy of the Pt 4f level by 0.6 eV, (3) a decrease in the specific chemisorption of H 2 and a decrease in activity in benzene hydrogenation and ethane hydrogenolysis, but an increase in activity in the synthesis of methanol from CO and H 2. The possible reasons for these effects are discussed on the basis of the concept of the direct interaction of Pt particles less than 10Åin size with surface Pr ions.
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