In situ infrared study of CO hydrogenation over silica and alumina-supported ruthenium and silica-supported iron
The synthesis of hydrocarbons from carbon monoxide and hydrogen over Ru/SiO/sub 2/, Ru/Al/sub 2/O/sub 3/, and Fe/SiO/sub 2/ catalysts has been studied under reaction conditions by infrared spectroscopy. Other than CO, the surface species which are observed during reaction contain only carbon and hydrogen. Strong CH/sub 2/ bands arising from long chain saturated hydrocarbons are observed at low reaction temperatures (T< 473 K) with ruthenium but not with iron. With increasing temperatures, these CH/sub 2/ bands on Ru decrease and are replaced by a single broad band. This may be a composite of CH/sub 2/ and CH/sub 3/ groups having one or at most a few carbon units attached to the metal surface. At these higher temperatures the spectra from Ru/SiO/sub 2/ and Fe/SiO/sub 2/ catalysts become similar, suggesting common surface intermediates. Additionally, at these temperatures bands corresponding to gas phase products (methane, ethane, propane) are also observed. Differences in the temperature dependence of the hydrocarbon bands from Ru/SiO/sub 2/ and Fe/SiO/sub 2/ are shown to be consistent with other published results. No evidence is found for the existence of hydroxy carbene or formyl species during reaction, adding to growing evidence that hydrocarbon synthesis over ruthenium and iron proceeds via initial formation of surface carbides. 22 references, 6 figures.
- Research Organization:
- Amoco Oil Co., Naperville, IL
- OSTI ID:
- 5448249
- Journal Information:
- J. Catal.; (United States), Vol. 61:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
METHANATION
ETHANE
CHEMICAL REACTION YIELD
IRON
CATALYTIC EFFECTS
METHANE
PROPANE
RUTHENIUM
ALUMINIUM OXIDES
CARBIDES
CATALYST SUPPORTS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN
IN-SITU PROCESSING
INFRARED SPECTRA
ISOLATED VALUES
REACTION INTERMEDIATES
SILICA
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
ALKANES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CRYOGENIC FLUIDS
DATA
DATA FORMS
ELEMENTS
FLUIDS
GASES
HYDROCARBONS
INFORMATION
KINETICS
MECHANICAL STRUCTURES
METALS
MINERALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PROCESSING
REACTION KINETICS
REFRACTORY METALS
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SUPPORTS
TRANSITION ELEMENTS
YIELDS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)
400201 - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400104 - Spectral Procedures- (-1987)