Analysis of the oxidation state of platinum particles in supported catalysts by double differentiation of XPS lines
M.Yu. Smirnov1, A.V. Kalinkin1, E.I. Vovk1,2, V.I. Bukhtiyarov1
1Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2Bilkent University, Bilkent, Ankara, 06800 Turkey
Keywords: модельные катализаторы, платина, диоксид кремния, рентгеновская фотоэлектронная спектроскопия, дифференцирование спектров, modelе catalysts, platinum, silicon dioxide, X-ray photoelectron spectroscopy, differentiation of the spectra
Abstract
In the work the double differentiation of functions describing the Pt4 f 7/2 band in the XPS spectra of model supported Pt/SiO2 catalysts is performed in order to determine the number of different chemical states of platinum particles. The functions for the differentiation are obtained by the deconvolution of the experimental spectral contour into two spin-orbit components. As a result of the performed analysis of the number and position of the minima of the second derivative of the function of Pt4 f 7/2 the conditions of the oxidation of platinum particles in the Pt/SiO2 sample on treating in a NO + O2 mixture and the reduction of platinum oxide particles on interacting of the PtO x /SiO2 sample with hydrogen are determined.
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