Author/Authors :
Beck، نويسنده , , I.E. and Kriventsov، نويسنده , , V.V. and Novgorodov، نويسنده , , B.N. and Yakimchuk، نويسنده , , E.P. and Kochubey، نويسنده , , D.I. and Zaikovsky، نويسنده , , V.I. and Pakharukov، نويسنده , , I.Yu. and Kozitsyna، نويسنده , , N.Yu. and Vargaftik، نويسنده , , M.N. and Bukhtiyarov، نويسنده , , V.I.، نويسنده ,
Abstract :
Recently great efforts are being devoted to develop new methods of preparation of high-disperse Pd–CeO2 containing nanosystems stabilized on an oxide matrix. A new approach of synthesis consists in using the heterometallic PdII2CeIV2(μ-OOCMe)12(H2O)2 complex as a precursor to anchor Pd nanoparticles on the surface of γ-alumina in direct contact with CeO2. The present work is devoted to a structural study of this disperse Pd–CeO2 containing nanosystem after oxidative or reductive pretreatments in comparison with monometallic alumina-supported samples by XAFS and TEM. A strong interaction between Pd and ceria in the catalyst produced in the studied system affects reducibility of both PdO and CeO2, which in turn results in an increased low-temperature activity in CO oxidation along with a dramatic change of the ignition–extinction curve.
Keywords :
TPR , EXAFS , Nanoparticles , CO oxidation , XANES , Catalysts
