Abstract
Temperature-programmed reduction (TPR) and oxidation (TPO) have been used to study a series of bimetallic Ru-Au catalysts supported on MgO and SiO 2. Metal-metal and metal-support interactions have been found which modify the nature of the species formed after impregnation and drying, and the oxidizability after reduction. The presence of gold in the MgO-supported catalysts lowers the reducibility of Ru, so that metallic gold can form before Ru is reduced to a significant extent. On silica, however, the reduction of both metals occurs in the same temperature range. These findings support the previous hypotheses concerning the genesis of the Ru-Au bimetallic particles/aggregates and the resulting surface composition.
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