A drastic synergistic effect has been found for the liquid-phase hydrogenation of aromatic hydrocarbons by the combination of Pt and Ru. The surface composition of Pt–Ru/SiO2 was estimated using O2–CO titration, and it was found that Pt was enriched on the surface of the bimetallic particles. The surface composition of the most active catalyst was nearly 50% Pt, suggesting that the Pt–Ru ensemble of a 1-to-1 ratio was active for the hydrogenation reaction.
The influence of trace oxygen on the catalytic activity of alumina supported Ru in the liquid phase hydrogenation of aromatic hydrocarbons was studied. The catalytic activity of Ru increased remarkably and the reproducibility was improved by removing dissolved oxygen from the reactant mixture and carefully refining the catalyst transfer procedure into the reactor to avoid exposure to air. Trace oxygen affected Ru very severely, but did not affect Rh, Pd, and Pt much. The activity of Ru was lower than those of Rh, Pd, and Pt in the presence of oxygen as reported in the literature; however, it was the highest when oxygen was removed carefully. Measurements of the adsorbed oxygen suggested that the activity seriously decreased when only the part of Ru surface was covered by oxygen. Bimetallic Pt-Ru catalysts demonstrated high activity even in the presence of oxygen.
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