Effect of pretreatment on the activity of a Ru-promoted Co/Al{sub 2}O{sub 3} Fischer-Tropsch catalyst

Journal Article · Sat Feb 01 00:00:00 EST 1997 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1997.1483· OSTI ID:518336

Belambe, A R; Oukaci, R; Goodwin, Jr, J G ^[1]

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1. Univ. of Pittsburgh, PA (United States)

The effect of calcination and reduction temperatures on the activity of a Ru-promoted Co/Al{sub 2}O{sub 3} catalyst for the CO hydrogenation reaction has been studied. The catalyst was prepared by the incipient wetness impregnation method and calcined and reduced at various temperatures. Along with overall steady-state rate analysis, steady-state isotopic transient kinetic analysis was used to investigate the effect of the pretreatment conditions on the intrinsic activity and coverages of surface intermediates. Catalyst characterization techniques such as XRD, TPR, and hydrogen chemisorption were also used. The calcination temperature was found to have a pronounced effect on the overall activity of the catalyst but not on the intrinsic activity of the catalyst sites. On the other hand, the reduction temperature had only a negligible effect on the overall and intrinsic activities. The decrease in rate at high calcination temperatures was caused by a decrease in the number of surface active sites due to a decrease in the reducibility of the catalyst. Neither the reduction nor the calcination conditions had any effect on chain growth probability. Calcination temperature did have, however, a small effect on CH{sub 4} selectivity. 38 refs., 5 figs., 5 tabs.

• OSTI ID: 518336
• Journal Information: Journal of Catalysis, Vol. 166, Issue 1; Other Information: PBD: Feb 1997
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
01 COAL, LIGNITE, AND PEAT
10 SYNTHETIC FUELS
COBALT
CATALYTIC EFFECTS
ALUMINIUM OXIDES
RUTHENIUM
CARBON MONOXIDE
HYDROGENATION
CATALYSTS
REDUCTION
REACTION INTERMEDIATES
X-RAY DIFFRACTION
TEMPERATURE DEPENDENCE
FISCHER-TROPSCH SYNTHESIS
CALCINATION
CHEMICAL REACTION KINETICS
CHEMISORPTION