Formation of Surface Platinum Oxides in the Interaction of the Pt/Sibunit Catalysts with NO2: Estimates of the Width of Oxide Shell from XPS Data

M. Yu Smirnov, E. I. Vovk, A. V. Kalinkin, P. A. Simonov, E. Yu Gerasimov, V. I. Bukhtiyarov

Результат исследования: Научные публикации в периодических изданияхстатья

1 Цитирования (Scopus)

Аннотация

The method of X-ray photoelectron spectroscopy (XPS) using two types of radiation, nonmonochromatic AlKα (hν = 1486.6 eV) and monochromatic AgLα (hν = 2984.3 eV), was used to study the interaction of the Pt/C (C = Sibunit) catalysts with NO2, which occurs in the preparation chamber of an XPS spectrometer at room temperature and NO2 pressure, equal to 3 × 10–6 mbar. It was found that, under these conditions, platinum was partially oxidized and metallic core becomes covered with a shell formed by a mixture of PtO and PtO2 oxides. The ratio of intensities Pt4f and Pt3d5/2 belonging to platinum oxides to the corresponding intensities of metallic platinum was used to estimate the width of oxide shell. For two of the three studied Pt/C samples, the width of the shell was 0.15–0.3 nm, which approximately corresponds to one monolayer of platinum oxide with a stoichiometry of PtO or PtO2.

Язык оригиналаанглийский
Страницы (с-по)663-671
Число страниц9
ЖурналKinetics and Catalysis
Том59
Номер выпуска5
DOI
СостояниеОпубликовано - 1 сен 2018

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