Microreactor and electron spectroscopy studies of Fischer-Tropsch synthesis on magnetite

Journal Article · Tue Dec 01 00:00:00 EST 1981 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(81)90002-6· OSTI ID:5724465

Krebs, H J ^[1]; Bonzel, H P; Schwarting, W; Gafner, G

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1. Kernforschungsanlage Juelich GmbH, Germany

The Fischer-Tropsch synthesis from CO and H/sub 2/ (1:3 mixture) at 1 bar total pressure and 570 K has been studied in a differential microreactor system on reduced and unreduced Fe/sub 3/O/sub 4/ (magnetite). The catalytic reactivity data were complemented by surface analytical measurements using Auger electron and x-ray photoelectron spectroscopy (XPS, ESCA). XPS measurements showed evidence of carbon deposition, mostly in the form of graphite on all samples. The rate of methanation on reduced magnetite was characterized by a maximum and subsequent decrease. Both features were dependent on the reduction history of the sample. All samples gave rise to the production of higher-molecular-weight species. The selectivity of reduced magnetite tended towards the formation of saturated hydrocarbons while that of the unreduced magnetite favoured the formation of alkenes. It was concluded that the reduction of magnetite led to a considerable increase in surface area and porosity and that secondary reactions of the alkenes caused the primary product spectrum to shift from alkenes to alkanes. Accordingly the polymerisation probability increased from 0.3 for unreduced magnetite (also for clean foil) to greater than or equal to 0.42 for reduced magnetite.

• OSTI ID: 5724465
• Journal Information: J. Catal.; (United States), Vol. 72:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
10 SYNTHETIC FUELS
CARBON MONOXIDE
METHANATION
FISCHER-TROPSCH SYNTHESIS
CATALYSIS
MAGNETITE
CATALYTIC EFFECTS
METHANE
CHEMICAL REACTIONS
EXPERIMENTAL DATA
HYDROGEN
PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DATA
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROCARBONS
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
MINERALS
NONMETALS
NUMERICAL DATA
ORES
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
010404* - Coal
Lignite
& Peat- Gasification
090121 - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)