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Global and Local Structure of Supported Pd Catalysts

Authors: V. Rednic, N. Aldea, P. Marginean, D. Macovei, C. M. Teodorescu, E. Dorolti, F. Matei


The supported Pd catalysts were analyzed by X-ray diffraction and X-ray absorption spectroscopy in order to determine their global and local structure. The average particle size of the supported Pd catalysts was determined by X-ray diffraction method. One of the main purposes of the present contribution is to focus on understanding the specific role of the Pd particle size determined by X-ray diffraction and that of the support oxide. Based on X-ray absorption fine structure spectroscopy analysis we consider that the whole local structure of the investigated samples are distorted concerning the atomic number but the distances between atoms are almost the same as for standard Pd sample. Due to the strong modifications of the Pd cluster local structure, the metal-support interface may influence the electronic properties of metal clusters and thus their reactivity for absorption of the reactant molecules.

Keywords: Synchrotron Radiation, X-Ray Absorption Spectroscopy, metal-support interaction, supported metal catalysts, X-raydiffraction

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[1] C. Sachs, A. Pundt, R. Kirchheim, M. Winter, M. T. Reetz, and D. Fritsch, "Solubility of hydrogen in single-sized palladium clusters", Phys. Rev. B, vol. 64, 075408, 2001.
[2] M. Suleiman, N. M. Jisrawi, O. Dankert, M. T. Reetz, C. Bähtz, R. Kirchheim and A. Pundt, "Phase transition and lattice expansion during hydrogen loading of nanometer sized palladium clusters" J. Alloys and Compounds, vol. 356-357, pp. 644-648, 2003.
[3] V. Ferrer, D. Finol, D. Rodriguez, F. Dominguez, R. Solano, J. Zarraga and J. Sanchez, "Chemical Characterization and Catalytic Activity of Pd-Supported Catalysts on Ce0.39Zr0.61Ox/SiO2", Catal Lett, vol. 132, pp. 292-298, 2009.
[4] Q. Zhu, B. Shen, H. Ling, R. Gu, "Effect of Various Supports on the Catalytic Activity of Pd for Cumene Hydroperoxide Hydrogenation", Catal Lett, vol. 132, pp. 464-471, 2009.
[5] Y. Li, Y. Xie and C. Liu, "Enhanced Activity of Bimetallic Pd-Based Catalysts for Methane Combustion", Catal Lett, vol. 125, pp. 130-133, 2008.
[6] R. Gopinath, N. S. Babu, J. V. Kumar, N. Lingaiah and P. S. Sai Prasad, "Influence of Pd Precursor and Method of Preparation on Hydrodechlorination Activity of Alumina Supported Palladium Catalysts", Catal Lett, vol. 120, pp. 312-319, 2008.
[7] S. Guerrero, P. Araya and Eduardo E. Wolf , "Methane oxidation on Pd supported on high area zirconia catalysts", Applied Catalysis A: General, vol. 298, pp. 243-253, 2006.
[8] C. Amorim, G. Yuan, P. M. Patterson and M. A. Keane, "Catalytic hydrodechlorination over Pd supported on amorphous and structured carbon", Journal of Catalysis, vol. 234, pp. 268-281, 2005.
[9] N. Aldea, R. Turcu, A. Nan, I. Craciunescu, O. Pana, X. Yaning, Zhonghua Wu, D. Bica, L. Vekas and F. Matei, "Investigation of nanostructured Fe3O4 polypyrrole core-shell composites by X-ray absorption spectroscopy and X-ray diffraction using synchrotron radiation", J.Nanopart. Res., vol. 11, pp. 1429-1439, 2009.
[10] E. A. Stern, "Theory of EXAFS" in X-ray absorption: principles, applications, techniques of EXAFS, SEXAFS and XANES, D.C. Koningsberger, R. Prins, Ed. New York: Weley, 1988.
[11] A. San-Miguel, "A program for fast classic or dispersive XAS data analysis in a PC", Physica B., vol. 208&209, pp. 177-179, 1995.
[12] J. J. Rehr, J. Mustre de Leon, S. I. Zabinsky, R. C. Albers, "Theoretical x-ray absorption fine structure standards", J. Am. Chem. Soc., vol. 113, no. 14, pp. 5135-5140, 1991.
[13] B. E. Warren, "Diffraction by imperfect crystals" in X-Ray Diffraction, Ed. New York: Dover Publication, pp. 251-254, 1990.
[14] H.P. Klug and L.E. Alexander, "X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials", 2nd ed., Ed. New York: John Wiley and Sons, 1974, pp. 618-708.
[15] D. Balzar, "X Ray Diffraction Line Broadening: Modelling and Applications to High -Tc Superconductors", J. Res. Nat. Inst. Stand. Technol., vol. 98, pp. 321-353, 1993.
[16] N. Aldea, A. Gluhoi, P. Marginean, C. Cosma and X. Yaning, "Extended X-ray absorption fine structure and X-ray diffraction studies on supported nickel catalysts", Spectrochim. Acta B, vol. 55, pp. 997-1008, 2000.
[17] D. C. Koningsberger and B. C. Gates, "Nature of the metal-support interface in supported metal catalysts: results from X-ray absorption spectroscopy", Catal. Lett., vol. 14, pp. 271-277, 1992.
[18] C. H. Lin, S. H. Hsu, M.Y. Lee and S. D. Lin, "Active morphology of Au/╬│-Al2O3-a model by EXAFS", J. Catal., vol. 209, pp. 62-68, 2002.
[19] R. Zanella, S. Giorgio, C. H. Shin, C. R. Henry, and C. Louis, "Characterization and reactivity in CO oxidation of gold nanoparticles supported on TiO2 prepared by deposition-precipitation with NaOH and urea", J. Catal., vol. 222, pp. 357-367, 2004.