Abstract
The supported Pt/SiO2 (EuroPt-1) catalyst has been studied by the radial distribution of electron density (RDED) and EXAFS techniques. The starting sample of the catalyst was stored in air, not subjected to any further treatment, and contained metal platinum Pt0 and platinum oxide PtO in a ∼1:2 ratio. An analysis of the EXAFS data was based on three possible structural models of platinum particles. Model 1 suggested that there was one Pt-Pt short contact, which was the same in the bulk of the particles and on the surface. Model 2 considered two different Pt-Pt distances for the particle volume and surface. For model 3, we additionally assumed that the corresponding Debye-Waller factors differed. For the oxidized sample, model 2 was most reliable, and the Pt-Pt distance between the surface atoms was shortened by ∼0.14 Å. For the reduced samples, the structural data obtained are consistent with model 3.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
I. E. Beck, I. V. Pakharukov, V. V. Kriventsov, et al., Abstracts of Int. Symp. on Relations between Homogeneous and Heterogeneous Catalysis, USA, California, 16–20 July, 2007, G. A. Somorjai (ed.), Univ. California, USA, p. 91.
B. Moraweck and A. J. Renouprez, Surf. Sci., 106, 35 (1981).
B. Moraweck, G. Clugnet, and A. J. Renouprez, ibid., 81, L631 (1979).
Yu. I. Petrov, Physics of Small Particles [in Russian], Nauka, Moscow (1982).
H. B. Lyon and G. A. Somorjai, J. Chem. Phys., 44, 3707 (1996).
G. A. Somorjaj, Catal. Lett., 7, 169 (1990).
D. Radivojevic, M. Ruitenbeek, K. Seshan, and L. Lefferts, J. Catal., 257, 255 (2008).
A. Kraynov and R. Richards, Appl. Catal. A, 314, 1 (2006).
Z. Paal, A. Wootsch, R. Schlogl, and U. Wild, ibid., 282, 135 (2005).
G. C. Bond and Z. Paal, Appl. Catal., 86, 11 (1992).
V. Gnutzman and W. Vogel, J. Phys. Chem., 94, 4991 (1990).
E. Fulop, Z. Paal, and W. Fogel, Appl. Catal., 66, 319 (1990).
G. C. Bond and P. B. Wells, ibid., 18, 225 (1985).
R. W. Joyner, J. Chem. Soc. Faraday Trans., I, 76, 357 (1980).
R. W. Joyner and P. Meehan, Vacuum, 33, 691 (1983).
Y. Yang, J. Pan, N. Zheng, et al., Appl.Catal., 61, 75 (1990).
S. D. Jackson, M. B. T. Keegan, G. D. McLellan, et al. in: Preparation of Catalysts, G. Poncelet, P. A. Jacobs, P. Grande, and B. Delmon (eds.), Elsevier, Amsterdam (1991), p. 135.
È. M. Moroz, Usp. Khim., 61, 356 (1992).
È. M. Moroz, D. A. Zyuzin, and K. I. Sheffer, J. Struct. Chem., 48, No. 2, 262–266 (2007).
A. Yu. Stakheev, O. P. Tkachenko, K. V. Klementiev, et al., Kinet. Katal., 46, No. 1, 114 (2005).
T. Fokushima, J. R. Katzer, D. E. Sayers, and J. Cook, New Horizonts in Catalysis, Elsevier, Amsterdam (1981), p. 79.
D. I. Kochubei, EXAFS Spectroscopy of Catalysts [in Russian], Nauka, Novosibirsk (1992).
K. V. Klementiev, Code VIPER for Windows, freeware: www.desy.de/~klmn/viper.html; K. V. Klementev, J. Phys. D: Appl. Phys., 34, 209 (2001).
N. Binsted, J. V. Campbell, S. J. Gurman, and P. C. Stephenson, EXCURV92 code, UK, SERC Daresbury Laboratory (1991).
D. R. Sandstrom, E. C. Marques, V. A. Biebesheimer, et al., Phys. Rev. B, 32, 3541 (1985).
R. E. Benfield, J. Chem. Soc., Faraday Trans., 88, 1107 (1992).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text Copyright © 2009 by È. M. Moroz, V. V. Kriventsov, and D. I. Kochubei
__________
Translated from Zhurnal Strukturnoi Khimii, Vol. 50, No. 6, pp. 1132–1138, November–December, 2009.
Rights and permissions
About this article
Cite this article
Moroz, È.M., Kriventsov, V.V. & Kochubei, D.I. EuroPt-1 catalyst: Radial distribution of electron density X-ray diffraction and EXAFS studies. J Struct Chem 50, 1082–1087 (2009). https://doi.org/10.1007/s10947-009-0159-z
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10947-009-0159-z