Transient response study of CO insertion into CH sub x surface intermediates on a vanadium-promoted rhodium catalyst

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90205-V· OSTI ID:7169770

Koerts, T; Santen, R.A. van ^[1]

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1. Eindhoven Univ. of Technology (Netherlands)

The rate of CO insertion into surface CH{sub x} species was investigated on silica-supported rhodium and rhodium-vanadium catalysts. Isotopically labelled {sup 13}CO was used in a transient kinetic experiment under steady-state conditions. A main conclusion is that vanadium promotion does not affect the rate of CO insertion. From temperature-programmed surface reaction measurements the surface concentration of CH{sub x} species during steady-state reaction was determined. It is increased by vanadium coadsorption. Combining these data with the selectivity and activity in synthesis gas to oxygenate conversion, a model is derived from which reaction rates of elementary steps and surface concentrations are calculated. Ethanal formation appears to occur at two distinguishable sites. Vanadium promotion decreases the desorption rate of ethanal, enhances the hydrogenation rate to ethanol, and increases the surface concentration of oxygenated intermediates.

• OSTI ID: 7169770
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 134:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ACETALDEHYDE
ADSORPTION
ALCOHOLS
ALDEHYDES
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
ELEMENTS
ETHANOL
EVEN-ODD NUCLEI
FLUIDS
GASES
HYDROGENATION
HYDROXY COMPOUNDS
ISOTOPES
KINETICS
LIGHT NUCLEI
MATHEMATICAL MODELS
METALS
METHANATION
NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION INTERMEDIATES
REACTION KINETICS
RHODIUM
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
STABLE ISOTOPES
SURFACE PROPERTIES
SYNTHESIS
SYNTHESIS GAS
TEMPERATURE CONTROL
TRANSIENTS
TRANSITION ELEMENTS
VANADIUM