Local environment of isolated iron in mesoporous silicate catalyst FeTUD-1

Nataša Novak Tušar, Alenka Ristić, Saša Cecowski, Iztok Arčon, Károly Lázár, Heinz Amenitsch, Venčeslav Kaučič

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Abstract

Mesoporous silicate catalyst FeTUD-1 containing only isolated iron was synthesized. Local environment of iron was investigated by X-ray Absorption and Mössbauer spectroscopies. XANES (X-ray Absorption Near Edge Structure) studies show that iron in the as-synthesized and template-free FeTUD-1 is present in the form of Fe3+ ions in coordination geometries posses an inversion center. EXAFS (X-ray Absorption Fine Structure) analyses reveal that iron cations in the as-synthesized sample are coordinated to four oxygens at the distance of 1.87 Å and in the template-free sample to one oxygen at 1.86 Å and five oxygens at 2.0 Å distances. Mössbauer spectroscopy proves the presence of iron in Fe3+ form in template-free sample. Moreover, it determines Fe3+ in two types of distorted octahedral coordinations.

Original languageEnglish
Pages (from-to)289-295
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume104
Issue number1-3
DOIs
Publication statusPublished - Aug 23 2007

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Keywords

  • EXAFS
  • FeTUD-1
  • Isolated iron
  • Mössbauer
  • SAXS
  • XANES

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

Tušar, N. N., Ristić, A., Cecowski, S., Arčon, I., Lázár, K., Amenitsch, H., & Kaučič, V. (2007). Local environment of isolated iron in mesoporous silicate catalyst FeTUD-1. Microporous and Mesoporous Materials, 104(1-3), 289-295. https://doi.org/10.1016/j.micromeso.2007.03.002