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The Effect of Water on the Activity and Selectivity for γ-Alumina Supported Cobalt Fischer–Tropsch Catalysts with Different Pore Sizes

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The effect of water on the activity and selectivity for a series of γ-Al2O3 supported cobalt Fischer–Tropsch catalysts has been studied in an isothermal fixed-bed reactor at T = 483 K, P = 20 bar, and H2/CO = 2.1. The catalysts were produced applying incipient wetness impregnation and consisted of 20 wt.% cobalt and 0.5 wt.% rhenium deposited on γ-Al2O3 supports with different pore characteristics. For the narrow-pore catalysts, addition of water corresponding to an inlet partial pressure ratio of PH2O/PH2 = 0.4 reduced the reaction rates. In contrast, for a catalyst with larger pores the same water pressure increased the reaction rates. For all catalysts, water amounts equal to PH2O/PH2 = 0.7 at the reactor inlet suppressed the reaction rates and led to permanent deactivation. The addition of water increased the C5+ selectivity and decreased the CH4 selectivity for all catalysts. The pore characteristics seem to determine the effect of water on the rates.

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Authors and Affiliations

  1. Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), NO-7491, Trondheim, Norway

    Øyvind Borg, Sølvi Storsæter & Anders Holmen

  2. Statoil R&D, Research Centre, Postuttak, NO-7005, Trondheim, Norway

    Sølvi Storsæter, Sigrid Eri, Hanne Wigum & Erling Rytter

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  1. Øyvind Borg
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  2. Sølvi Storsæter
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  3. Sigrid Eri
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  5. Erling Rytter
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  6. Anders Holmen
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Correspondence to Anders Holmen.

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Borg, Ø., Storsæter, S., Eri, S. et al. The Effect of Water on the Activity and Selectivity for γ-Alumina Supported Cobalt Fischer–Tropsch Catalysts with Different Pore Sizes. Catal Lett 107, 95–102 (2006). https://doi.org/10.1007/s10562-005-9736-8

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