Comparison of States of Substituted Iron in MCM-41 and MFI Molecular Sieves under Reaction Conditions

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Redox properties of substituted iron in low-iron content Fe-MFI (Si/Fe≈200) and Fe-MCM-41 (Si/Fe=137) samples were compared by in situ Mössbauer spectroscopy (in vacuum, H2, CO, N2O, at 300 K <T< 600 K). The Fe3+ ↔ Fe2+ conversion may proceed reversibly in both hosts. In MFI the rigid structure of the framework is manifested: framework-substituted ferric ions are not reduced, the Fe3+ to Fe2+ reduction proceeding only on extraframework ions. The MCM-41 host is more flexible, allowing various Fe2+ coordinations to occur in the pore wall.

Original languageEnglish
Pages (from-to)387-390
Number of pages4
JournalHyperfine Interactions
Issue number1-4
Publication statusPublished - Jun 28 2002


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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