Selectivity change in CO hydrogenation by oxidation-reduction treatment of Ru/Al/sub 2/O/sub 3/: selectivity versus morphology of Ru
Journal Article
·
· J. Phys. Chem.; (United States)
Effects of oxidation-reduction treatment on the microstructure of Ru particles and catalytic activity and selectivity of Ru/Al/sub 2/O/sub 3/ for CO hydrogenation were investigated. The Ru/Al/sub 2/O/sub 3/ catalysts were prepared from Ru/sub 3/(CO)/sub 12/ and RuCl/sub 3/. H/sub 2/ absorption, TEM, XRD, and EXAFS studies showed that, after reduction, Ru prepared from Ru/sub 3/(CO)/sub 12/ consisted of small particles (10 A), but when prepared from RuCl/sub 3/, they consisted of aggregates of small particles. Oxidation with O/sub 2/ at 500/sup 0/C and subsequent reduction changed the Ru particles to large single crystallites. In CO hydrogenation, the main product after only reduction was higher hydrocarbons, but the catalysts pretreated with O/sub 2/ produced mainly methane. Therefore, the significant change in the selectivity is presumably caused by the changes in the microstructure of Ru particles from aggregates of smaller crystallites to larger crystallites.
- Research Organization:
- Univ. of Tokyo (Japan)
- OSTI ID:
- 5277709
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:3; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHLORIDES
CHLORINE COMPOUNDS
DATA
ELEMENTS
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
INFORMATION
METALS
METHANATION
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PLATINUM METALS
REDUCTION
REFRACTORY METAL COMPOUNDS
RUTHENIUM
RUTHENIUM CHLORIDES
RUTHENIUM COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONYLS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHLORIDES
CHLORINE COMPOUNDS
DATA
ELEMENTS
EXPERIMENTAL DATA
HALIDES
HALOGEN COMPOUNDS
INFORMATION
METALS
METHANATION
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PLATINUM METALS
REDUCTION
REFRACTORY METAL COMPOUNDS
RUTHENIUM
RUTHENIUM CHLORIDES
RUTHENIUM COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS