The structural features of the supported platinum species were
determined by analyzing radial distribution functions of electron
density 4?r 2 ?(r), where ?(r) is the electron density at distance r.
These functions were obtained by the Fourier transformation of
normalized scattering intensity in the X-ray diffraction [25–28].
The procedure used for calculating RDF (see elsewhere for details
[16,26,29]) allows interatomic distances (r) and coordination num-
bers (CN) to be determined from position and area of peaks in the
RDF curve. Accuracy of the r and CN values determination is 0.5%
and 5%, respectively. Analysis of RDF provides information about
the local atomic structure and makes it possible to identify phases
with a crystallite size smaller than 3 nm. A comparison between
the experimental RDF and RDF calculated from structural models is
usually performed [16,29]. Data required for the model RDFs, such
as interatomic distances and coordination numbers of compounds
investigated here, were calculated from structural data of the ICSD
database