Analysis of the oxidation state of platinum particles in supported catalysts by double differentiation of XPS lines
Date
2016
Authors
Smirnov, M. Y.
Kalinkin, A. V.
Vovk, E. I.
Bukhtiyarov, V. I.
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Journal of Structural Chemistry
Print ISSN
0022-4766
Electronic ISSN
Publisher
M A I K Nauka - Interperiodica
Volume
57
Issue
6
Pages
1127 - 1133
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Series
Abstract
In the work the double differentiation of functions describing the Pt4f7/2 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 Pt437/2 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 PtOx/SiO2 sample with hydrogen are determined.