Author/Authors :
Kriventsov، نويسنده , , V.V. and Simakova، نويسنده , , I.L. and Simakov، نويسنده , , A. and Smolentseva، نويسنده , , E. and Castillon، نويسنده , , F. and Estrada، نويسنده , , M. and Vargas، نويسنده , , E. and Yakimchuk، نويسنده , , E.P. and Ivanov، نويسنده , , D.P. and Aksenov، نويسنده , , D.G. and Andreev، نويسنده , , D.V. and Novgorodov، نويسنده , , B.N. and Kochubey، نويسنده , , D.I. and Fuentes، نويسنده , , S.، نويسنده ,
Abstract :
This work is devoted to a structural study of the finely dispersed nanosized gold species supported on nanosized mixed oxides prepared by the sol–gel method. An analysis of the XANES (Au-L3) spectra has revealed mainly Au3+ cations located on the oxide matrix surface in distorted octahedral coordination for the catalysts reduced at 150 °C. For the catalysts reduced at 300 °C, a highly distorted metallic gold species has been mainly found, within the method limitation. The synthesized catalysts have also been characterized by transmission electron microscopy (TEM), BET, X-ray diffraction (XRD) and XPS.
Keywords :
EXAFS , Nanoparticle , Gold catalytic system , Local structure , XANES , XPS , XRD
