Methanation studies over well-characterized silica-supported Pt-Ru bimetallic clusters

Journal Article · Wed Mar 31 23:00:00 EST 1982 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(82)90028-8· OSTI ID:5322004

Miura, H; Gonzalez, R D

A methanation study over a well-characterized series of silica-supported Pt-Ru bimetallic clusters has been completed. Surface compositions, determined by O/sub 2/-CO titration using a pulse technique, show considerable surface enrichment in Pt. Turnover numbers and activation energies for CH/sub 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/sub 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/sub 2/ formation gas chromatographically, increased as the surface concentration of Pt was increased. 4 figures, 2 tables.

• Research Organization: Univ. of Rhode Island, Kingston
• OSTI ID: 5322004
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 74:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ACTIVATION ENERGY
ALKANES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISORPTION
CHROMATOGRAPHY
DATA
DEPOSITION
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FLUIDS
GAS CHROMATOGRAPHY
GASES
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
INFORMATION
KINETICS
METALS
METHANE
MINERALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PULSE TECHNIQUES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
REACTION KINETICS
RUTHENIUM
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TITRATION
TRANSITION ELEMENTS
YIELDS