Hydrogenation of Carbon Dioxide over K‐Promoted FeCo Bimetallic Catalysts Prepared from Mixed Metal Oxalates

  • Muthu Kumaran Gnanamani
    Center for Applied Energy Research University of Kentucky 2540 Research Park Drive Lexington Kentucky 40511 USA
  • Hussein H. Hamdeh
    Department of Physics Wichita State University Wichita Kansas 67260 USA
  • Gary Jacobs
    Center for Applied Energy Research University of Kentucky 2540 Research Park Drive Lexington Kentucky 40511 USA
  • Wilson D. Shafer
    Center for Applied Energy Research University of Kentucky 2540 Research Park Drive Lexington Kentucky 40511 USA
  • Shelley D. Hopps
    Center for Applied Energy Research University of Kentucky 2540 Research Park Drive Lexington Kentucky 40511 USA
  • Gerald A. Thomas
    Center for Applied Energy Research University of Kentucky 2540 Research Park Drive Lexington Kentucky 40511 USA
  • Burtron H. Davis
    Center for Applied Energy Research University of Kentucky 2540 Research Park Drive Lexington Kentucky 40511 USA

Abstract

<jats:title>Abstract</jats:title><jats:p>The hydrogenation of carbon dioxide over K‐promoted FeCo bimetallic catalysts prepared by sequential oxalate decomposition and carburization of FeCo with CO was studied in a fixed‐bed reactor at 240 °C and 1.2 MPa. The initial CO<jats:sub>2</jats:sub> conversion was found to be dependent on K loading, whereas both unpromoted and K‐promoted FeCo catalysts (except 90Fe10Co3.0K) exhibited similar levels of CO<jats:sub>2</jats:sub> conversion after a few hours of time on stream. A decarburization study on freshly activated and used FeCo suggests that potassium increases the stability of iron carbides and graphitic carbon under a reducing atmosphere. Also, K addition tends to decrease the hydrogenation function of FeCo bimetallic catalysts and, thus, controls product selectivity. Under similar CO<jats:sub>2</jats:sub> conversions, potassium enhanced acetic acid formation while suppressing ethanol production, which indicates that a common intermediate might be responsible for the changes observed with C<jats:sub>2</jats:sub> oxygenates.</jats:p>

Journal

  • ChemCatChem

    ChemCatChem 9 (7), 1303-1312, 2017-03-24

    Wiley

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