Abstract
(Pt, Ru)/SiO 2 catalysts [the n( Pt + Ru) atoms were equivalent to 10wt% Pt] were prepared by impregnation, and subsequent hydrogen reduction. Interaction with hydrogen and oxygen were studied as a function of the ruthenium content and of the temperature. The hydrogen coverage ( at 25° C, p( H 2) = 1070 Pa) was first found to decrease with increasing Ru content, then it remained relatively constant. The oxygen chemisorption of O 2 near room temperature was characteristic of one O atom per Pt s and two O atoms per Ru s stoichiometries. As temperature was increased an enrichment of the surface alloy in Ru was observed. Oxidizing treatment at 500°C led to the segregation of the sample.
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