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Comparative study of the structure of protective oxide layers on the surface of macrocrystalline iron and a promoted catalyst of synthesis of ammonia by absorption and conversion Mössbauer spectroscopy

  • Physical Chemistry
  • Published:
Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Conclusions

  1. 1.

    The protective layer of microcrystalline iron consists of crystallites of hematite magnetically ordered at 20‡C and ∿0.1 Μm in size, and the phase composition of the surface and bulk of the sample is qualitatively the same in all conditions of oxidation.

  2. 2.

    The passivating film of the promoted catalyst of synthesis of ammonia is formed from small clusters of iron oxide with an effective size of 0.005–0.01 Μm; the composition of the surface and bulk of the stabilized catalyst is qualitatively different.

  3. 3.

    The role of the defects in the promoted catalyst in the mechanism of formation of oxide clusters was discussed.

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Literature cited

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Authors and Affiliations

  1. N. N. Semenov Institute of Chemical Physics, Academy of Sciences of the USSR, Moscow

    Yu. V. Maksimov, P. Ya. Kolotyrkin, Yu. V. Baldokhin & A. V. Krylova

Authors
  1. Yu. V. Maksimov
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  2. P. Ya. Kolotyrkin
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  3. Yu. V. Baldokhin
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  4. A. V. Krylova
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Additional information

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1470–1476, July, 1989.

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Maksimov, Y.V., Kolotyrkin, P.Y., Baldokhin, Y.V. et al. Comparative study of the structure of protective oxide layers on the surface of macrocrystalline iron and a promoted catalyst of synthesis of ammonia by absorption and conversion Mössbauer spectroscopy. Russ Chem Bull 38, 1344–1349 (1989). https://doi.org/10.1007/BF00978414

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  • DOI: https://doi.org/10.1007/BF00978414

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