Promoter effects on precipitated iron catalysts for Fischer-Tropsch synthesis

The effects of potassium and copper promotion on the activity and selectivity of precipitated iron catalysts for Fischer--Tropsch synthesis (FTS) were studied in a fixed bed reactor at 1.48 MPa and 235--265{degrees} C using synthesis gas with a H{sub 2}/CO = 1 molar feed ratio. It was found that bot...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 1990-02, Vol.29 (2), p.194-204
Main Authors: Bukur, Dragomir B, Mukesh, Doble, Patel, Snehal A
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
010408 - Coal, Lignite, & Peat- C1 Processes- (1987-)
08 HYDROGEN
080108 - Hydrogen- Production- Steam-Iron Process
400201 - Chemical & Physicochemical Properties
ALKALI METALS
Applied sciences
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPPER
ELEMENTS
Energy
Exact sciences and technology
FISCHER-TROPSCH SYNTHESIS
FLUIDS
Fuel processing. Carbochemistry and petrochemistry
Fuels
Gas processing
GASES
HYDROGEN
HYDROGEN COMPOUNDS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IRON
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PACKED BED
POTASSIUM
SHIFT PROCESSES
SYNTHESIS GAS
TRANSITION ELEMENTS
WATER
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Summary:The effects of potassium and copper promotion on the activity and selectivity of precipitated iron catalysts for Fischer--Tropsch synthesis (FTS) were studied in a fixed bed reactor at 1.48 MPa and 235--265{degrees} C using synthesis gas with a H{sub 2}/CO = 1 molar feed ratio. It was found that both potassium and copper increase the catalyst activity for FTS and the water gas shift reaction. Potassium promotion ({approximately} 0.2--1 wt %) results in an increase in the average molecular weight of hydrocarbon products and suppression of secondary reactions (olefin hydrogenation and isomerization of 1-alkenes to 2-alkenes). Copper promotion ({approximately} 3 wt %) has a similar effect on the hydrocarbon distribution, but it enhances slightly the secondary reactions. The activity of doubly promoted (100 Fe/3 Cu/{ital x}K, {ital x} = 0.2 or 0.5) catalysts was higher than that of singly promoted catalysts and was independent of potassium loading, whereas their selectivity behavior was strongly influenced by their potassium loading. Product selectivities on the 100 Fe/3 Cu/0.2 K catalyst were similar to those of the 100 Fe/3 Cu catalyst, whereas selectivities of the 100 Fe/3 Cu/0.5 K catalyst were similar to those obtained in tests with the 100 Fe/0.5 K catalyst.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie00098a008