Hydrogenation of CO and CO/sub 2/ over rhodium catalysts supported on various metal oxides

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · J. Catal.; (United States)

OSTI ID:6826575

Iizuka, T; Tanaka, Y; Tanabe, K

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), Journal Name: J. Catal.; (United States) Vol. 76:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BUTANE
BUTENES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
DATA
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY
ETHANE
EXPERIMENTAL DATA
FLUIDS
GASES
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE EFFECTS
ISOTOPES
KINETICS
LIGHT NUCLEI
LOW PRESSURE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MEDIUM TEMPERATURE
METALS
METHANATION
METHANE
MINERALS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PRESSURE DEPENDENCE
PROPANE
PROPYLENE
REACTION KINETICS
RHODIUM
SILICA
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
SYNTHESIS
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES