Chain length dependence of {alpha}-olefin readsorption in Fischer-Tropsch synthesis

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1995.1068· OSTI ID:525936

Kuipers, E W; Vinkenburg, I H; Oosterbeek, H ^[1]

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1. Koninklijke/Shell Laboratorium Amsterdam (Netherlands)

The total product concentration and the paraffin/olefin ratio have been measured up to C{sub 14} for Fischer-Tropsch synthesis on polycrystalline Co foils. The influences due to surface area, a wax coating, the H{sub 2}/CO ratio and flow velocity on concentration and selectivity have been determined. The paraffin/olefin ratio increases exponentially with chain length which is attributed to a chain-length-dependent olefin readsorption mechanism. The probability of readsorption depends on the heat of physisorption of the olefins on the catalyst as well as on their heat of dissolution in and their diffusivity through the product wax. All three factors predict an increase of the paraffin/olefin ratio with carbon number. Physisorption and dissolution are shown to cause a much stronger chain-length dependence than diffusion and will usually dominate. 36 refs., 9 figs.

• OSTI ID: 525936
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 152; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
40 CHEMISTRY
ADSORPTION
ALKANES
ALKENES
CATALYTIC EFFECTS
COBALT
FISCHER-TROPSCH SYNTHESIS
FOILS
HETEROGENEOUS CATALYSIS
SORPTIVE PROPERTIES
SURFACE AREA