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Sulfur as a Selectivity Modifier in a Highly Active Rh/Fe2O3/ZrO2 Catalyst for Water–Gas Shift

Authors

  • Abrar A. Hakeem,

    1. Catalysis Engineering, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft (The Netherlands), Fax: (+31) 152785006
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  • Jaikishen Rajendran,

    1. Catalysis Engineering, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft (The Netherlands), Fax: (+31) 152785006
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  • Prof. Dr. Freek Kapteijn,

    1. Catalysis Engineering, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft (The Netherlands), Fax: (+31) 152785006
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  • Prof. Dr. Ir. Michiel Makkee

    Corresponding author
    1. Catalysis Engineering, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft (The Netherlands), Fax: (+31) 152785006
    • Catalysis Engineering, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft (The Netherlands), Fax: (+31) 152785006===

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Abstract

The presence of small amounts of sulfur (<500 ppm) on a Rh/Fe2O3/ZrO2 catalyst improves its water–gas shift (WGS) selectivity and stability under typical industrial conditions. Rh/Fe2O3/ZrO2 is a highly active WGS catalyst, but it produces small amounts of methane as a side product. The formation of methane is due to the presence of rhodium in the catalyst. Sulfur selectively poisons the site(s) responsible for methane formation. The improved selectivity and prolonged stability of the catalyst is maintained as long as sulfur is present.

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