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NOxadsorption study over Pt–Ba/alumina catalysts: FT-IR and pulse experiments

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
222
Issue
2
Identifiers
DOI: 10.1016/j.jcat.2003.11.013
Keywords
  • Lean Denox
  • Noxstorage
  • Lean Noxtrap
  • Pt–Ba/γ-Al2O3
  • Transient Response Method
  • Fourier Transform Infrared

Abstract

Abstract Adsorption of NO, NO/O 2, and NO 2 on Pt–Ba–Al–O system is investigated at 350 °C by the transient response method (TRM) and FT-IR spectroscopy. The data suggest that in the presence of oxygen, NO is effectively adsorbed (at a Ba site in proximity of a Pt site) through stepwise oxidation to form at first nitrites that are progressively transformed into nitrates. NO is also oxidized to NO 2 over Pt in the presence of oxygen. NO 2 is directly adsorbed to form Ba nitrates according to a disproportionation reaction, which occurs with the evolution of NO. The stepwise oxidation route seems to play a major role in NO x storage from NO/O 2 mixtures.

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