Properties of nitrogen-oxygen surface compounds on ZrO2 samples with different phase compositions according to in situ IR spectroscopy data

V. A. Matyshak, A. N. Il'ichev, V. A. Sadykov, O. N. Sil'chenkova, V. N. Korchak

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The zirconium dioxide surface has a wide variety of adsorption sites differing in their nature. The proportions of these sites can be changed by varying the oxide preparation and pretreatment conditions. This fact shows itself as a wide diversity of surface structures resulting from NO and O2 adsorption. Under conditions of the selective catalytic reduction of NOx, the most stable nitrogen oxide species are nitrates that result from the interaction between NOx and the ZrO2 surface. The concentrations of the other nitrogen-oxygen surface compounds are two orders of magnitude lower. The routes of NO3- formation and decomposition on the ZrO2 surface are discussed. In these routes, monodentate nitrates (which show themselves at 1550-1555 cm-1) are considered as intermediates in the formation and decomposition of bidentate NO3-.

Original languageEnglish
Pages (from-to)226-236
Number of pages11
JournalKinetics and Catalysis
Volume56
Issue number2
DOIs
Publication statusPublished - 1 Mar 2015
Externally publishedYes

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