Catalysis Letters

, Volume 14, Issue 2, pp 233–239 | Cite as

On the influence of oxygen on iron catalysts during ammonia synthesis and catalyst characterization

  • B. Fastrup
  • H. Nygård Nielsen


Once again attention is brought to the sensitivity of iron catalysts to poisoning by sub ppm levels of oxygen and a procedure is suggested to evaluate the purity of the gas supply to a steady state flow reactor setup. It is demonstrated that extremely high gas purities are essential, in particular for studies of alkali promoted samples.


Iron catalysts ammonia synthesis oxygen poisoning potassium promoter 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    P.E. Højlund Nielsen, in:Catalytic Ammonia Synthesis, Fundamentals and Practice, ed. J.R. Jennings (Plenum Press, New York, 1991).Google Scholar
  2. [2]
    J.A. Almquist and C.A. Black, J. Am. Chem. Soc. 48 (1926) 2814.Google Scholar
  3. [3]
    P. Stoltze, Phys. Scripta 36 (1987) 824.Google Scholar
  4. [4]
    A. Nielsen,An Investigation on Promoted Iron Catalysts for Ammonia Synthesis, 3rd Ed. (Gjellerup, Copenhagen, 1968).Google Scholar

Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1992

Authors and Affiliations

  • B. Fastrup
    • 1
  • H. Nygård Nielsen
    • 1
  1. 1.Haldor Topsøe Research LaboratoriesLyngbyDenmark

Personalised recommendations