Thermal stability of surface nitrogen–oxygen complexes and phase transitions in ZrO2

V. A. Matyshak, O. N. Sil’chenkova, V. A. Sadykov, V. N. Korchak

Результат исследования: Научные публикации в периодических изданияхстатья

1 Цитирования (Scopus)

Аннотация

The IR spectra of surface compounds observed in the course of the temperature-programmed desorption (TPD) of NOx 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 NOx 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.

Язык оригиналаанглийский
Страницы (с-по)234-242
Число страниц9
ЖурналKinetics and Catalysis
Том57
Номер выпуска2
DOI
СостояниеОпубликовано - 1 мар 2016

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