Nature of active sites in the Fe-TON Zeolites: Mössbauer and IR studies

Mirosław Derewiński, Kinga Góra-Marek, Karoly Lázár, Jerzy Datka

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

Results on the stability of framework Fe atoms obtained for the ZSM-22 zeolites of different iron contents - members of the TON family - are presented. They show how the formation of extraframework iron species can modify the parent acidity of the Fe-TON zeolites. Mössbauer spectroscopy revealed that iron atoms were partially extracted from the framework during both high-temperature template elimination and activation of the NH4 form prior to the reaction. The extent of the Fe removal depended on the iron content and was higher for samples of low Si/Fe ratios. Unexpectedly, strength of the Brensted sites was found to be higher also for iron rich samples. It was postulated that an interaction between the extraframework iron species of a cationic character and the neighbouring bridging Si-OH-Fe groups enhanced the acidity of the existing Brensted sites.

Original languageEnglish
Title of host publicationZeolites and related materials
Subtitle of host publicationTrends, targets and challenges
Pages865-868
Number of pages4
EditionB
DOIs
Publication statusPublished - Nov 6 2008

Publication series

NameStudies in Surface Science and Catalysis
NumberB
Volume174
ISSN (Print)0167-2991

    Fingerprint

Keywords

  • FTIR
  • Fe-TON
  • Mössbauer
  • acidity
  • extraframework iron

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Derewiński, M., Góra-Marek, K., Lázár, K., & Datka, J. (2008). Nature of active sites in the Fe-TON Zeolites: Mössbauer and IR studies. In Zeolites and related materials: Trends, targets and challenges (B ed., pp. 865-868). (Studies in Surface Science and Catalysis; Vol. 174, No. B). https://doi.org/10.1016/S0167-2991(08)80025-0