Coordination and oxidation states of iron incorporated in mesoporous MCM41

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3 Citations (Scopus)

Abstract

Mesoporous Fe-MCM41 samples (Si/Fe = 25) were synthesized and characterized under evacuation and reducing/oxidizing treatments by in situ FTIR and Mössbauer spectroscopies. Both Fe(II) and Fe(III) located in low coordination states in top layers of pore walls exhibit Lewis acidity and may participate in Fe(III) ↔ Fe(II) processes at low temperatures (570 K). Furthermore, Fe(III) ↔ Fe(II) cycles can be achieved and repeated with participation of the full amount of iron at higher temperatures (670 K). The accompanying formation of oxygen vacancies and restoration of the structure in the reverse process does not result in extended damages; the MCM41 structure retains its stability under the conditions applied.

Original languageEnglish
Pages (from-to)19-31
Number of pages13
JournalHyperfine Interactions
Volume139-140
Issue number1-4
DOIs
Publication statusPublished - Dec 1 2002

Keywords

  • Fe-MCM41
  • Mesoporous ferrisilicate
  • Reversible Fe(III) ↔ Fe(II) processes

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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