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  • 1 Higher School of Chemical Technology Department of Physical Chemistry Bourgas (Bulgaria)
  • 2 Mendeleev Institute of Chemical Technology Moscow (USSR)
  • 3 L. Eötvös University Laboratory of Nuclear Chemistry Budapest (Hungary)
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Phase composition of Co-promoted ammonia synthesis catalysts has been studied by means of Mössbauer spectroscopy and X-ray diffractometry. Co-promoted catalysts have maximum activity at 5–7% CoO concentration. This result is associated with the substitution of 1–2 Fe atoms by Co-atoms per unit cell of the bcc -Fe lattice being the active phase for catalysis.