Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3

A. A. Battiston, J. H. Bitter, F. M.F. De Groot, A. R. Overweg, O. Stephan, J. A. Van Bokhoven, P. J. Kooyman, C. Van Der Spek, G. Vankó, D. C. Koningsberger

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Abstract

The evolution of iron in over-exchanged Fe/ZSM5 prepared via chemical vapor deposition of FeCl3 was studied at each stage of the synthesis. Different characterization techniques (EXAFS, HR-XANES, 57Fe Mössbauer spectroscopy, 27Al NMR, EELS, HR-TEM, XRD, N 2 physisorption, and FTIR spectroscopy) were applied in order to correlate the changes occurring in the local environment of the Fe atoms with migration and aggregation phenomena of iron at micro- and macroscopic scale. Mononuclear isolated Fe-species are formed upon FeCl3 sublimation, which are transformed into binuclear Fe-complexes during washing. During calcination, iron detached from the Brønsted sites migrates to the external surface of the zeolite, finally leading to significant agglomeration. Nevertheless, agglomeration of Fe can be strongly suppressed by adequately tuning the conditions of the calcination.

Original languageEnglish
Pages (from-to)251-271
Number of pages21
JournalJournal of Catalysis
Volume213
Issue number2
DOIs
Publication statusPublished - Jan 25 2003

Keywords

  • Binuclear
  • Calcination
  • Evolution
  • Fe/ZSM5
  • Iron
  • Synthesis

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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    Battiston, A. A., Bitter, J. H., De Groot, F. M. F., Overweg, A. R., Stephan, O., Van Bokhoven, J. A., Kooyman, P. J., Van Der Spek, C., Vankó, G., & Koningsberger, D. C. (2003). Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3. Journal of Catalysis, 213(2), 251-271. https://doi.org/10.1016/S0021-9517(02)00051-9