Comparison of catalysts derived from oxidation of Ru sub 3 Th sub 7 with impregnated Ru/ThO sub 2 catalysts
Journal Article
·
· Journal of Physical Chemistry; (USA)
- Univ. of Pittsburgh, PA (USA)
Ruthenium-thoria catalysts, prepared either by oxidation of Ru{sub 3}Th{sub 7} intermetallic or impregnation of high surface area ThO{sub 2} with Ru(NO)(NO{sub 3}){sub 3}, were characterized by ESCA, ISS, X-ray diffraction (XRD), chemisorption, and gravimetric measurements. XRD and gravimetric analysis indicated that the intermetallic was extensively decomposed by oxidation at 350{degree}C. ESCA and ISS Ru/Th intensity ratios for the intermetallic-derived catalyst were significantly lower than those obtained for the supported catalyst. This suggests a relative surface enrichment of Th in the alloy-derived catalyst. The catalysts were tested for CO hydrogenation. The turnover frequency of the catalyst derived from Ru{sub 3}Th{sub 7} was 2 orders of magnitude higher than that of the catalyst prepared by impregnation. Exceptionally high methane selectivity was observed for the intermetallic-derived catalyst. The activity and selectivity data are discussed in terms of the reported structure sensitivity of the CO hydrogenation reaction and the differences in surface structures between the two types of catalysts.
- OSTI ID:
- 6735935
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:11; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Thesis/Dissertation
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Sat Dec 31 23:00:00 EST 1988
·
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·
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Related Subjects
36 MATERIALS SCIENCE
360100 -- Metals & Alloys
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
CATALYSTS
CHALCOGENIDES
CHEMISTRY
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL CHEMISTRY
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
360100 -- Metals & Alloys
360102 -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
CATALYSTS
CHALCOGENIDES
CHEMISTRY
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL CHEMISTRY
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS