Abstract
A methanation study over a well-characterized series of silica-supported Pt-Ru bimetallic clusters has been completed. Surface compositions, determined by O 2-CO titration using a pulse technique, show considerable surface enrichment in Pt. Turnover numbers and activation energies for CH 4 formation were determined for Pt-Ru bimetallic cluster catalysts having the following Pt surface compositions: 17.9, 50, 73, and 99%. The results suggest that Ru ensembles are necessary to catalyze the methanation reaction as Pt-Ru dual sites show a catalytic behavior characteristic of Pt. When the surface composition of Ru is high, the observed turnover number for CH 4 formation is in good agreement with the sum total of the corresponding turnover numbers for methanation on the separate metals. For low surface concentrations of Ru, the reverse is true. A temperature-programmed pulse technique was used to study carbon formation by pulsing CO over each catalyst as the temperature was increased in flowing He. The temperature of incipient carbon formation, as determined by measuring CO 2 formation gas chromatographically, increased as the surface concentration of Pt was increased.
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