Hydrogenation of CO and CO/sub 2/ over rhodium catalysts supported on various metal oxides
The formation of hydrocarbons in the reaction of CO + H/sub 2/ and CO/sub 2/ + H/sub 2/ was studied over rhodium catalysts supported on ZrO/sub 2/, Al/sub 2/O/sub 3/, SiO/sub 2/, and MgO. Among those catalysts, Rh on ZrO/sub 2/ was most active and Rh-MgO was least active for the above reactions. Over Rh-ZrO/sub 2/, the CO/sub 2/ + H/sub 2/ reaction took place even at 50/sup 0/C, whereas the CO + H/sub 2/ reaction occurred only at temperature higher than 130/sup 0/C. The reaction of CO/sub 2/ + H/sub 2/ produced only methane at temperatures up to 200/sup 0/C, but a small amount of CO formed along with methane in the reverse water gas shift reaction above 200/sup 0/C. In the case of the CO + H/sub 2/ reaction, the higher molecular weight hydrocarbons (C/sub 2/ approx. C/sub 4/) as well as CH/sub 4/ formed. The inverse kinetic isotope effect was observed in both reactions of CO + H/sub 2/(D/sub 2/) and CO/sub 2/ + H/sub 2/(D/sub 2/) over Rh-ZrO/sub 2/. However, the isotope effect was not observed in the CO/sub 2/ + H/sub 2/(D/sub 2/) reaction over Rh-Al/sub 2/O/sub 3/ whose effect in the CO + H/sub 2/ reaction was still inverse. The activity for the CO + H/sub 2/ reaction over the oxidized Rh-ZrO/sub 2/ and Rh-Al/sub 2/O/sub 3/ was almost 2 to 10 times higher than that on the reduced catalyst. The reaction mechanisms of the above reactions are discussed. 2 figures, 4 tables.
- Research Organization:
- Hokkaido Univ., Sapporo, Japan
- OSTI ID:
- 6826575
- Journal Information:
- J. Catal.; (United States), Vol. 76:1
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
CATALYTIC EFFECTS
BUTANE
SYNTHESIS
BUTENES
CARBON DIOXIDE
CHEMICAL REACTION YIELD
METHANATION
CARBON MONOXIDE
DEUTERIUM
ISOTOPE EFFECTS
ETHANE
MAGNESIUM OXIDES
METHANE
PROPANE
PROPYLENE
RHODIUM
SILICA
ZIRCONIUM OXIDES
ACTIVATION ENERGY
CATALYST SUPPORTS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
DEUTERIUM COMPOUNDS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN
LOW PRESSURE
MEDIUM TEMPERATURE
PRESSURE DEPENDENCE
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DATA
ELEMENTS
ENERGY
FLUIDS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNESIUM COMPOUNDS
METALS
MINERALS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
ZIRCONIUM COMPOUNDS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)
400201 - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400302 - Organic Chemistry- Isotope Effects- (-1987)