Characterization of supported cobalt catalysts for CO hydrogenation

Miscellaneous · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7035180

Polansky, C A

Temperature-programmed reduction, X-ray photoelectron spectroscopy, and X-ray diffraction have been used as characterization techniques to investigate the effects caused by the support and metal precursor on the catalytic and reduction behaviors of dispersed cobalt CO hydrogenation catalysts. Silica, cerium oxide, and lanthanum oxide have been employed as supports. The nitrate, chloride, and acetate salts were used as the cobalt precursors. Both calcined and uncalcined catalysts have been studied. Under almost all of the conditions studied, the cobalt nitrate-derived catalysts had the highest activity for CO hydrogenation. The cobalt chloride-derived catalysts were generally poor catalysts with very low activity, unless the catalysts were calcined prior to the reduction process. The support appears to be the dominant factor in reaction selectivity with the average chain length of the hydrocarbon products having the following order: Co/La{sub 2}O{sub 3} > Co/CeO{sub 2} > Co/SiO{sub 2}. The cobalt precursor did not have any measurable effect on the reaction selectivity, but it had a strong influence on overall catalyst activity. It has been shown that both the support and the precursor affect the calcination process. Complete conversion of the precursor to Co{sub 3}O{sub 4} occurs only for the CeO{sub 2}-supported catalysts. Co{sub 3}O{sub 4} was not detected for cobalt acetate supported on silica. The La{sub 2}O{sub 3}-supported catalysts formed LaCoO{sub 3} as a result of the calcination process. These species had different reduction behaviors from the uncalcined catalysts as shown by changes in CO hydrogenation activity, temperature-programmed reduction profiles, and X-ray photoelectron spectra.

• Research Organization: Texas A and M Univ., College Station, TX (USA)
• OSTI ID: 7035180
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON MONOXIDE
HYDROGENATION
METHANATION
CATALYSTS
CHEMICAL PREPARATION
COBALT
CATALYTIC EFFECTS
ACETATES
CALCINATION
CATALYST SUPPORTS
CERIUM OXIDES
COBALT CHLORIDES
COBALT COMPOUNDS
COBALT NITRATES
COBALT OXIDES
COMPARATIVE EVALUATIONS
LANTHANUM OXIDES
PHOTOELECTRON SPECTROSCOPY
REDUCTION
SILICA
TEMPERATURE CONTROL
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
CARBON COMPOUNDS
CARBON OXIDES
CARBOXYLIC ACID SALTS
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
CONTROL
DECOMPOSITION
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
LANTHANUM COMPOUNDS
METALS
MINERALS
NITRATES
NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RARE EARTH COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)