Characterization of catalysts derived from oxidation of Ru sub x Th sub y intermetallics

Journal Article · Thu Aug 23 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100380a041· OSTI ID:6348395

Huang, Chenshi; Houalla, M; Hercules, D M ^[1]; Kibby, C L; Petrakis, L ^[2]

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1. Univ. of Pittsburgh, PA (USA)
2. Gulf Research and Development Company, Pittsburgh, PA (USA)

Ru methanation catalysts derived from oxidation of Ru{sub x}Th{sub y} intermetallics were characterized by X-ray photoelectron spectroscopy (ESCA), ion scattering spectroscopy (ISS), X-ray diffraction (XRD), BET surface area measurements, chemisorption, and gravimetric analysis. XRD measurements and gravimetric analysis indicated that all intermetallics were extensively decomposed by oxidation in air at 350{degree}C. ESCA and ISS Ru/Th intensity ratio measurements showed that surface segregation of ThO{sub 2} occurred for all catalysts. The structure of the intermetallic-derived (IM) catalysts can best be described as Ru particles embedded in a ThO{sub 2}-rich overlayer. Comparison of hydrogen and CO uptake with N{sub 2} BET surface area suggests that CO more accurately titrates surface Ru than does hydrogen. Extensive spillover of hydrogen from Ru to ThO{sub 2} was also observed for all IM catalysts. On the basis of CO chemisorption, the CO hydrogenation turnover frequency was comparable for all the IM catalysts.

• OSTI ID: 6348395
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:17; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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CATALYSTS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
GRAVIMETRIC ANALYSIS
ION SCATTERING ANALYSIS
METALS
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NONDESTRUCTIVE ANALYSIS
PHOTOELECTRON SPECTROSCOPY
PLATINUM METALS
QUANTITATIVE CHEMICAL ANALYSIS
RUTHENIUM
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
X-RAY DIFFRACTION