Identification of Neutral and Charged N_xO_y Surface Species by IR Spectroscopy

Abstract

The infrared spectral performance of the N _x O _y species observed on oxide surfaces [N₂O, NO⁻, NO, (NO)₂, N₂O₃, NO⁺, NO₂ ⁻ (different nitro and nitrito anions), NO₂, N₂O₄, N₂O₅, NO₂, and NO₃ ⁻ (bridged, bidentate, and monodentate nitrates)] is considered. The spectra of related compounds (N₂, H-, and C-containing nitrogen oxo species, C─N species, NH _x species) are also briefly discussed. Some guidelines for spectral identification of N _x O _y adspecies are proposed and the transformation of the nitrogen oxo species on catalyst surfaces are regarded.

Keywords:

• Adsorption
• Environmental catalysis
• IR spectroscopy
• Nitrates
• Nitrites
• Nitrogen oxides
• NO decomposition
• Selective catalytic reduction

ACKNOWLEDGMENTS

This work was supported by the Bulgarian National Research Foundation (Project X-534). The author is also indebted to the Alexander von Humboldt Foundation.