The effect of supports on the activity and selectivity of Co - Ni alloy catalysts for CO hydrogenation

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90104-C· OSTI ID:5532122

Ishihara, Tatsumi; Horiuchi, Nobuhiko; Eguchi, Koichi; Arai, Hiromichi ^[1]

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1. Kyushu Univ., Fukuoka (Japan)

The CO hydrogenation activity of 50Co50Ni alloy catalysts strongly depended on the oxide support. Electron-donating oxides such as MgO, PbO, and ZnO lowered the overall activity of the 50Co50Ni metal. The CO conversion as well as the chain growth probability was high over 50Co50Ni/TiO{sub 2} and 50Co50Ni/MnO{sub 2}. The infrared spectra of adsorbed NO indicated that the electron density of the 50Co50Ni metal was low when it was supported on electron-accepting oxide. The results of desorption measurements suggest that metal-support interaction has a great influence on the surface concentration of hydrogen and carbon monoxide, and adsorption of carbon monoxide and hydrogen is weakened by increasing the electronegativity of the oxide support. Since the rate of H{sub 2}-D{sub 2} exchange correlated well with the CO hydrogenation rate, activation of hydrogen is of primary importance in this catalyst system. The low electron density of the alloy supported on the electron-accepting oxides such as TiO{sub 2} and SiO{sub 2} weakens CO adsorption, resulting in an increase in surface coverage of hydrogen. Thus sufficient coverage of hydrogen leads to a high CO hydrogenation rate.

• OSTI ID: 5532122
• Journal Information: Journal of Catalysis; (United States), Vol. 130:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON MONOXIDE
METHANATION
CATALYST SUPPORTS
PERFORMANCE
COBALT ALLOYS
CATALYTIC EFFECTS
NICKEL ALLOYS
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
CONFIGURATION INTERACTION
CORRELATIONS
DESORPTION
DEUTERIUM
ELECTRON DENSITY
ELECTRON TRANSFER
ELECTRONEGATIVITY
HYDROGEN
HYDROGENATION
ISOTOPIC EXCHANGE
LEAD OXIDES
MAGNESIUM OXIDES
MANGANESE OXIDES
SILICON OXIDES
SURFACE PROPERTIES
TITANIUM OXIDES
ZINC OXIDES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LEAD COMPOUNDS
LIGHT NUCLEI
MAGNESIUM COMPOUNDS
MANGANESE COMPOUNDS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SILICON COMPOUNDS
STABLE ISOTOPES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)