Redistribution of iron ions in porous ferrisilicates during redox treatments

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Abstract

Relocation of iron ions in microporous Fe-FER, (Al+Fe)-FER, Fe-MFI (FER: ferrierite, MFI: silicalite) and in mesoporous Fe-MCM-41 ferrisilicate (MCM: Mobile Crystalline Material) samples was followed during redox treatments primarily by tool of the in situ Mössbauer spectroscopy. Coexistence of various Fe3+ and Fe2+ species is demonstrated. In microporous Fe-FER and Fe-MFI existence of combined μ-oxo iron dimers, Fe3+FW-O-Fe2+EFW can be proposed. The presence of these dimers can easily be correlated with catalytic effect shown in certain oxidation processes. Structural rearrangement can also be revealed in mesoporous Fe-MCM-41 which result in improvement of catalytic performance in CO oxidation.

Original languageEnglish
Pages (from-to)471-479
Number of pages9
JournalPure and Applied Chemistry
Volume89
Issue number4
DOIs
Publication statusPublished - Apr 1 2017

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Keywords

  • Dinuclear μ-oxo iron
  • Framework and extra-framework iron
  • In situ Mössbauer spectroscopy
  • Porous ferrisilicates
  • SSC-2016
  • μ-oxo iron dimers

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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