Stabilization of catalytically active gold species in Fe-modified zeolites

N. Bogdanchikova, A. Simakov, E. Smolentseva, A. Pestryakov, M. H. Farias, J. A. Diaz, A. Tompos, M. Avalos

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The influence of iron additive on redox, electronic and catalytic properties of gold incorporated into zeolite catalysts has been studied by means of TEM, XPS, XRD, TPR, ICP and AES. The interaction of gold with iron modifier was observed in Y-zeolites and mordenites with different cations and method of Fe incorporation (impregnation or ion exchange). This interaction leads to mutual influence on redox properties of Fe and Au ionic species and facilitates their reduction. Limited diffusion of Au precursor after Fe species deposition in narrow mordenite channels does not permit to incorporate Au in adequate concentration, while in large super-cage of Y-zeolites this limitation is absent. The structure of Y-zeolites favors formation of active gold species. Catalytic tests in CO oxidation show that Fe additive stabilizes the gold active species active at low-temperature (partly charged clusters) and makes them insensitive to redox treatments.

Original languageEnglish
Pages (from-to)4075-4083
Number of pages9
JournalApplied Surface Science
Volume254
Issue number13
DOIs
Publication statusPublished - 30 Apr 2008

Keywords

  • Gold
  • Impregnation
  • Ion exchange
  • Iron additive
  • Nanoparticles
  • Zeolite

ASJC Scopus subject areas

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

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    Bogdanchikova, N., Simakov, A., Smolentseva, E., Pestryakov, A., Farias, M. H., Diaz, J. A., Tompos, A., & Avalos, M. (2008). Stabilization of catalytically active gold species in Fe-modified zeolites. Applied Surface Science, 254(13), 4075-4083. https://doi.org/10.1016/j.apsusc.2007.12.060