Fractal dimension of zirconia nanopowders and their activity in the CO oxidation

被引：15
|
作者：
Trypolskyi, A. I. [1 ]
Gurnyk, T. M. [1 ]
Strizhak, P. E. [1 ]
机构：
[1] Natl Acad Sci Ukraine, LV Pysarzhevsky Inst Phys Chem, UA-03028 Kiev, Ukraine
来源：
CATALYSIS COMMUNICATIONS | 2011年 / 12卷 / 08期
关键词：
Zirconia; Fractal dimension; Catalysis; CO oxidation; Rate constant; HETEROGENEOUS CATALYSIS; ADSORPTION; GASES;
D O I：
10.1016/j.catcom.2011.01.003
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We present a study of the CO oxidation on zirconia nanopowders consisted of nanoparticles with a size in a range of 3-7 nm. The fractal characteristics of zirconia nanopowders were studied both by nitrogen adsorption and small-angle X-ray scattering. The surface fractal dimension of zirconia is approximately constant and equals to 2 indicating that zirconia nanoparticles have a smooth surface in all solids. The mass fractal dimension is in the range between 2.1 and 2.5 showing a difference in nanoparticle aggregation depending on their size. Catalytic tests indicate that the activation energy of the CO oxidation on zirconia nanopowders (E-a) is constant. We associate this observation with constancy of the surface fractal dimension. The pre-exponential factor of the rate constant (k(o)) varies significantly decreasing with increasing the mass fractal dimension of solids. This finding is in a good agreement with theoretical approach developed in this communication. (c) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：766 / 771
页数：6
相关论文
共 50 条
  • [1] Effect of fractal dimension of porous catalysts on the macrokinetics of CO oxidation
    Tripol'skii A.I.
    Kosmambetova G.R.
    Strizhak P.E.
    Gritsenko V.I.
    Theoretical and Experimental Chemistry, 2006, 42 (4) : 245 - 249
  • [2] Fractal dimension of zirconia grain in alumina/zirconia ceramic composites
    Meng, X
    Shang, C
    Zhi, R
    GRAIN GROWTH IN POLYCRYSTALLINE MATERIALS II, PTS 1 AND 2, 1996, 204- : 709 - 712
  • [3] The effect of fractal dimension of porous catalysts on the activation energy of CO oxidation
    Tripol'skii A.I.
    Strizhak P.E.
    Theoretical and Experimental Chemistry, 2007, 43 (1) : 50 - 53
  • [4] Effect of fractal dimension of zirconium dioxide on its catalytic properties in the oxidation of CO
    Tripol'skii, A. I.
    Gurnik, T. N.
    Strizhak, P. E.
    Ivashchenko, T. S.
    THEORETICAL AND EXPERIMENTAL CHEMISTRY, 2009, 45 (04) : 258 - 262
  • [5] Effect of fractal dimension of zirconium dioxide on its catalytic properties in the oxidation of CO
    A. I. Tripol’skii
    T. N. Gurnik
    P. E. Strizhak
    T. S. Ivashchenko
    Theoretical and Experimental Chemistry, 2009, 45 : 258 - 262
  • [6] Monte Carlo simulations of catalytic CO oxidation on fractal surfaces of dimension between two and three
    Park, H
    Kim, H
    Lee, S
    SURFACE SCIENCE, 1997, 380 (2-3) : 514 - 521
  • [7] Activity dependence of solar supergranular fractal dimension
    Paniveni, U.
    Krishan, V.
    Singh, Jagdev
    Srikanth, R.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 402 (01) : 424 - 428
  • [8] In vitro evaluation of zirconia nanopowders
    Braccini, S
    Leonelli, C
    Lusvardi, G
    Malavasi, G
    Menabue, L
    BIOCERAMICS 16, 2004, 254-2 : 899 - 902
  • [9] Fractal structure of ceria nanopowders
    V. K. Ivanov
    O. S. Polezhaeva
    G. P. Kopitsa
    A. E. Baranchikov
    Yu. D. Tret’yakov
    Inorganic Materials, 2008, 44
  • [10] Fractal structure of ceria nanopowders
    Ivanov, V. K.
    Polezhaeva, O. S.
    Kopitsa, G. P.
    Baranchikov, A. E.
    Tret'yakov, Yu. D.
    INORGANIC MATERIALS, 2008, 44 (03) : 272 - 277
12345