Catalysis Letters

, Volume 142, Issue 6, pp 698–713

Fischer–Tropsch Synthesis: Preconditioning Effects Upon Co-Containing Promoted and Unpromoted Catalysts

  • Donald C. Cronauer
  • Jeffrey W. Elam
  • A. Jeremy Kropf
  • Christopher L. Marshall
  • Pei Gao
  • Shelley Hopps
  • Gary Jacobs
  • Burtron H. Davis
Article

DOI: 10.1007/s10562-012-0818-0

Cite this article as:
Cronauer, D.C., Elam, J.W., Kropf, A.J. et al. Catal Lett (2012) 142: 698. doi:10.1007/s10562-012-0818-0

Abstract

In the preparation and evaluation of Fischer–Tropsch (FT) catalysts, active catalysts formed by both incipient wetness impregnation (IWI) and atomic layer deposition (ALD) of major components were demonstrated. ALD-deposited Co on a silica support was more effective than a similar catalyst deposited upon a support of ALD-deposited Al2O3 on silica. The addition of Co reduction promoters including Pt, Ir and Ru using either ALD or IWI has been shown to strongly affect the catalyst pre-conditioning step. CO conversion results were consistent with previously reported Temperature Programmed Reduction X-ray Absorption Near-edge Structure/Extended X-ray Absorption Fine Structure Spectroscopy (TPR-XANES/EXAFS) experiments observing the nature of chemical transformations occurring during the activation of cobalt-based FT catalysts in hydrogen. Specifically, there exists a 2-step reduction process involving Co3O4 to CoO and CoO to Co0 transformations. The extent of catalyst preconditioning was strongly affected by the reduction temperature (with 400 °C preferred) and the loading of the promoter. This was demonstrated using a continuous-flow catalytic-bed unit with a 2:1 molar blend of H2:CO, at temperatures ranging from about 260 to 300 °C, pressures averaging 1.3 MPa (190 psia), and gas space velocities about 24 NL/h-g.

Graphical Abstract

https://static-content.springer.com/image/art%3A10.1007%2Fs10562-012-0818-0/MediaObjects/10562_2012_818_Figa_HTML.gif

Keywords

Fischer–TropschCatalyst pretreatmentPromotersCobaltAluminaIncipient wetness impregnationAtomic layer depositionTPREXAFSXANES

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Donald C. Cronauer
    • 1
  • Jeffrey W. Elam
    • 1
  • A. Jeremy Kropf
    • 1
  • Christopher L. Marshall
    • 1
  • Pei Gao
    • 2
  • Shelley Hopps
    • 2
  • Gary Jacobs
    • 2
  • Burtron H. Davis
    • 2
  1. 1.Argonne National LaboratoryArgonneUSA
  2. 2.Center for Applied Energy ResearchLexingtonUSA