UV-Raman characterization of iron peroxo adsorbates on Fe/MFI catalyst with high activity for NOx reduction

Zhi Xian Gao, Hack Sung Kim, Qi Sun, Peter C Stair, Wolfgang M H Sachtler

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The interaction of O2 with Fe supported on zeolite MFI has been investigated by the in situ UV Raman technique. Previously, the formation of adsorbed superoxide ions, O2 - on the Fe/MFI prepared by sublimation of FeCl3 vapor onto HMFI, was identified by ESR at 77 K. In situ Raman data indicate that adsorbed peroxideions, O2 2-, are formed on the same catalysts with Fe/Al = 1 even at 300 K. A band at 730 cm-1, which was found to be sensitive to the partial pressure of O2, is tentatively assigned to the stretching vibration of peroxide ions. With the 18O2 isotope, a red shift of 32 cm-1 was observed for the 730 cm-1 band. Raman features of other catalyst samples show that the binuclear iron sites in the Fe/MFI are essential for the formation of peroxide ions. As proposed before, the same bridging sites between two Fe ions, that are occupied by O2- in the calcined catalyst, are also able to adsorb di-oxygen complexes.

Original languageEnglish
Pages (from-to)6186-6190
Number of pages5
JournalJournal of Physical Chemistry B
Volume105
Issue number26
DOIs
Publication statusPublished - Jul 5 2001

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Adsorbates
Iron
Ions
iron
catalysts
Catalysts
Peroxides
peroxides
ions
Zeolites
inorganic peroxides
Sublimation
sublimation
Superoxides
Isotopes
red shift
Partial pressure
Stretching
partial pressure
Paramagnetic resonance

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

UV-Raman characterization of iron peroxo adsorbates on Fe/MFI catalyst with high activity for NOx reduction. / Gao, Zhi Xian; Kim, Hack Sung; Sun, Qi; Stair, Peter C; Sachtler, Wolfgang M H.

In: Journal of Physical Chemistry B, Vol. 105, No. 26, 05.07.2001, p. 6186-6190.

Research output: Contribution to journalArticle

Gao, Zhi Xian ; Kim, Hack Sung ; Sun, Qi ; Stair, Peter C ; Sachtler, Wolfgang M H. / UV-Raman characterization of iron peroxo adsorbates on Fe/MFI catalyst with high activity for NOx reduction. In: Journal of Physical Chemistry B. 2001 ; Vol. 105, No. 26. pp. 6186-6190.
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