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Hyperfine Interactions

, Volume 57, Issue 1–4, pp 1741–1746 | Cite as

NGR study of iron molybdates and iron-cobalt molybdates catalysts

  • B. Benaichouba
  • P. Bussiere
  • H. Ponceblanc
Surface Phenomena, Catalysis, Corrosion

Abstract

Iron molybdates FM and cobalt-iron molybdates CF x M (which means Co1−yFe y MoO4 withy=x/100 6≤x≤67), used as matrix of catalysts for propene mild oxidation, were studied by Mössbauer spectroscopy at 295 K and 4 K. All the spectra exhibit three Fe2+ doublets, two of them correspond to β-FeMoO4 and the third one to α-FeMoO4. Enhancement of quadrupole splittings of Fe2+ in the spectra of the CF x M catalysts is ascribed to the occurrence of a solid solution of either iron in CoMoO4 or cobalt in FeMoO4. In each spectrum at 295 K one or several Fe3+ doublets were present, which low temperature spectra allow to be assigned to Fe2(MoO4)3, small particles of Fe2O3, solid solution of Fe3+ in ferrous molybdates and even Fe2MoO4 in some cases. The behaviour of all the iron species of these solids during reduction by hydrogen is described.

Keywords

Iron Cobalt Solid Solution Propene Fe2O3 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1990

Authors and Affiliations

  • B. Benaichouba
    • 1
  • P. Bussiere
    • 1
  • H. Ponceblanc
    • 1
  1. 1.Institut de Recherches sur la CatalyseC.N.R.S., conventionné avec l'Université Claude BernardVilleurbanne CédexFrance

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