Interaction of N2O with Ag+ ion-exchanged zeolites: An FT-IR spectroscopy and quantum chemical ab initio and DFT studies

N. U. Zhanpeisov, G. Martra, W. S. Ju, M. Matsuoka, S. Coluccia, M. Anpo

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

FT-IR spectroscopy and theoretical ab initio as well as density functional (DFT) methods have been applied to the investigation of the interaction of N2O with Ag+ counter-cations in a ZSM-5 zeolite. As a preliminary part of the study, the adsorption of N2O on the parent H-Na-ZSM-5 zeolite (from which the Ag-ZSM-5 system was obtained by ion exchange) and the adsorption of CO at low temperature on Ag-ZSM-5, in order to monitor the dispersion of the Ag+ ions, were also performed. It was observed that N2O could be adsorbed on Ag+ counter-cations both N-end and O-end down. The two forms produce distinct bands due to the νNN mode, clearly observable in the 2300-2200 cm-1 range. Conversely, only the νNO band due to the N-end down adduct was observed at 1325 cm-1, the component corresponding to the O-end down form falling below the low frequency limit of IR transparency of the system. Interestingly, the band due to the νNN mode of N2O molecules O-end down adsorbed on Ag+ ions appeared coincident with that of N2O in interaction with Al-OH and ≡Si-OH-Al≡ groups left in the zeolite after exchange with Ag+. However, the former N2O adducts on silver cations appeared to be slightly more stable (less reversible) than the latter adducts.

Original languageEnglish
Pages (from-to)237-246
Number of pages10
JournalJournal of Molecular Catalysis A: Chemical
Volume201
Issue number1-2
DOIs
Publication statusPublished - 2003 Jul 1
Externally publishedYes

Keywords

  • Ab initio
  • Ag ion-exchanged zeolite
  • DFT
  • FT-IR
  • NO adsorption

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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