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

研究成果: Article査読

36 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)237-246
ページ数10
ジャーナルJournal of Molecular Catalysis A: Chemical
201
1-2
DOI
出版ステータスPublished - 2003 7月 1
外部発表はい

ASJC Scopus subject areas

  • 触媒
  • プロセス化学およびプロセス工学
  • 物理化学および理論化学

フィンガープリント

「Interaction of N2O with Ag+ ion-exchanged zeolites: An FT-IR spectroscopy and quantum chemical ab initio and DFT studies」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル