Structural peculiarities of nanocrystalline Ce-Sm-O catalysts with Ruthenium modified surface

Elena Frolova 1Maria I. Ivanovskaya 1Vladislav A. Sadykov 2

1. Research Institute of physical-chemical problems (FHP), Leningradskaja 14, Minsk 220050, Belarus
2. Boreskov Institute of Catalysis (BIC), pr. akad. Lavrentieva, 5, Novosibirsk 630090, Russian Federation


In the present work, we report on successful preparation of the Ce-Sm-O/Ru catalysts based on an organic-free modification of the sol-gel technique, since the ceria-based materials are essential as components of promoters in the many catalyst systems. A series of samples with Sm 5-15 % mol content were characterized by TEM, XRD, BET, FTIR, XPS, and ESR. Also, the catalytic properties of some Ce-Sm-O and Ce-Sm-O/Ru samples were studied. We examined powdered Ce-Sm-O samples derived from thermally treated sol-gel products - xerogels (X) and precipitates (P) of Ce-Sm hydroxides after the ammonia-promoted hydrolysis of aqueous Ce-Sm nitrates. The crystallization of amorphous materials obtained started at 600 oC resulting in cubic Ce1-xSmxO2-y (x = 0.05-0.15) solid solution. According ESR data after samples Ru-treatment, the concentration of Ce3+ centers became 100 times higher for the samples prepared by thermal treatment of xerogels. In contrast, for the samples prepared from precipitates this concentration increased only 50 times. According to XRD analysis, the sudden change of unit cell parameter for Ce1-0.1Sm0.1O2 were observed. This very sample with maximum paramagnetic centers concentration after Ru-containing solution impregnation possesses the highest catalytic activity in methane conversion reaction.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: must be provided.


Related papers
  1. Doping and structural features of the apatite-type lanthanum silicate in the La2O3–SiO2–Al2O3 and La2O3–SiO2–Fe2O3 systems
  2. Structure and functional properties of ceramic oxygen-conducting membranes
  3. Synthesis and structural peculiarities of Ce–Zr–La–O catalysts
  4. Genesis of Al-doped apatite-type nanocrystalline lanthanum silicates prepared by mechanochemical synthesis: Phase, structural and microstructural study
  5. Nanocrystalline Ce0.45Zr0.45La0.10O2-y for CH4 oxidation: characterization and the origin of improved catalytic performance
  6. Ceria-zirconia nanoparticles doped with La or Gd: effect of the doping cation on the real structure
  7. Pt-supported nanocrystalline ceria-zirconia doped with La, Pr or Gd: factors controlling syngas generation in partial oxidation/autothermal reforming of methane or oxygenates
  8. Semiconductor thin film sensor based on γ-Fe2O3 for CH4 detection

Presentation: Poster at E-MRS Fall Meeting 2006, Symposium B, by Elena Frolova
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 10:45
Revised:   2009-06-07 00:44
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine