Abstract
The IR spectra of surface compounds observed in the course of the temperature-programmed desorption (TPD) of NO x and the TPD spectra are compared. The high-temperature peaks of desorption are related to the decomposition of surface nitrites and nitrates. The low-temperature peaks of NO x desorption with maximums below 140°C are caused by the decomposition of surface nitrosyls. On the heating of surface nitrosyls, the following two reaction paths are possible: desorption at low temperatures and conversion into nitrates. The shape of the TPD spectra of NO depends on the phase composition of test samples. The transition of a tetragonal phase into a monoclinic one occurred upon the surface dehydroxylation of polycrystalline particles with the formation of particles with a tetragonal nucleus and a monoclinic crust. This transition is reversible. The cooling of a sample in a moist atmosphere leads to the transition of the monoclinic crust to the tetragonal phase.
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Original Russian Text © V.A. Matyshak, O.N. Sil’chenkova, V.A. Sadykov, V.N. Korchak, 2016, published in Kinetika i Kataliz, 2016, Vol. 57, No. 2, pp. 228–236.
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Matyshak, V.A., Sil’chenkova, O.N., Sadykov, V.A. et al. Thermal stability of surface nitrogen–oxygen complexes and phase transitions in ZrO2 . Kinet Catal 57, 234–242 (2016). https://doi.org/10.1134/S002315841602004X
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DOI: https://doi.org/10.1134/S002315841602004X