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Valency Changes of Iron and Tin in Framework-Substituted Molecular Sieves Investigated by in Situ Mössbauer Spectroscopy

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Abstract

Valency changes of iron and tin in framework-substituted microporous and mesoporous molecular sieves (Fe-ETS-10, Fe-ZSM-5, Fe-AlPO-11, Sn-ZSM-12 and Sn-MCM-41) have been studied under reducing and oxidizing conditions by in situ Mössbauer spectroscopy. It is demonstrated that the structure of the host matrices strongly influences the stabilization and the oxidation state of the ions. Debye temperature, ΘD, data also are estimated, they support the suggested structural assignment of various species.

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Authors and Affiliations

  1. Institute of Isotopes and Surface Chemistry, CRC, HAS, Budapest, P.O.B. 77, H-1525, Hungary

    K. Lázár

  2. National Chemical Laboratory, Pune, 411 008, India

    A. J. Chandwadkar & A. V. Ramaswamy

  3. Department of Environmental and Applied Chemistry, University of Szeged, H-6720, Szeged, Hungary

    P. Fejes

  4. J. Heyrovsky Institute of Physical Chemistry, 182 23, Prague 8, Czech Republic

    J. Čejka

Authors
  1. K. Lázár
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  2. A. J. Chandwadkar
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  3. P. Fejes
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  4. J. Čejka
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  5. A. V. Ramaswamy
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Lázár, K., Chandwadkar, A.J., Fejes, P. et al. Valency Changes of Iron and Tin in Framework-Substituted Molecular Sieves Investigated by in Situ Mössbauer Spectroscopy. Journal of Radioanalytical and Nuclear Chemistry 246, 143–148 (2000). https://doi.org/10.1023/A:1006718106583

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