Catalysis Letters

, Volume 31, Issue 2–3, pp 197–207 | Cite as

Catalytic dehydrogenation of iminodibenzyl to iminostilbene. A comparison of potassium-promoted manganese, iron and cobalt oxide catalysts

  • A. Knell
  • D. Monti
  • A. Baiker


The dehydrogenation of iminodibenzyl (10,11-dihydro-5-dibenz[b.f]azepine) to iminostilbene (5H-dibenz[b.f]azepine) was investigated over potassium-promoted oxides of manganese, iron and cobalt. Both unsupported oxides as well as corresponding oxides supported on magnesium oxide were examined. Catalytic tests were carried out in a continuous fixed-bed reactor in the presence of steam in the temperature range of 400–550°C and at atmospheric pressure. Unsupported, potassium-promoted iron oxide proved to be the most suitable catalyst for the dehydrogenation of iminodibenzyl, yielding iminostilbene with 80% selectivity at nearly 100% conversion.


dehydrogenation of 10,11-dihydro-5-dibenz[b.f]azepine 5H-dibenz[b.f]azepine iminodibenzyl iminostilbene catalytic behaviour manganese oxide iron oxide cobalt oxide promotion potassium 


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Copyright information

© J.C. Baltzer AG, Science Publishers 1995

Authors and Affiliations

  • A. Knell
    • 1
  • D. Monti
    • 2
  • A. Baiker
    • 1
  1. 1.Department of Chemical Engineering and Industrial ChemistrySwiss Federal Institute of TechnologyZurichSwitzerland
  2. 2.Ciba, Pharmaceutical DivisionBaselSwitzerland

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