Effect of niobium on the surface properties of Nb2O5-SiO2-supported Mo catalysts

被引：37
作者：
Damyanova, S [1 ]
Dimitrov, L
Petrov, L
Grange, P
机构：
[1] Bulgarian Acad Sci, Inst Catalysis, BU-1113 Sofia, Bulgaria
[2] Catholic Univ Louvain, Unite Catalyse & Chim Mat Divises, B-1348 Louvain, Belgium
来源：
APPLIED SURFACE SCIENCE | 2003年 / 214卷 / 1-4期
关键词：
Nb2O5-SiO2; oxides; molybdenum; acidity; dispersion; XPS;
D O I：
10.1016/S0169-4332(03)00347-7
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：
Nb2O5-SiO2 oxides with different Nb content (0.8-4.4 wt.%) were prepared by impregnation of silica with ethanol solution of niobium ethoxide, Nb(OC2H5)(5). Mo catalysts supported on the Nb2O5-SiO2 carriers were prepared by wetness impregnation method of the supports with an aqueous solution of ammonium heptamolybdate, (NH4)(6)MO7O24. The samples were characterized by X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS). The chemical state and dispersion of metal components (Nb and Mo) were studied in the oxides and Mo-containing catalysts. It was shown a good correlation between the amount of Nb and XPS intensity Nb/Si ratios in oxide supports. Generation of new acid sites (Lewis and Bronsted) in Nb2O5-SiO2 samples was easily understood when considering the change in the binding energies of Nb 3d and 0 Is photoelectrons, due to a strong interaction between Nb atoms and silica. It was found that addition of niobium improves the dispersion of molybdenum on silica. (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：68 / 74
页数：7
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共 28 条
  • [1] On the metastability of 'monolayer coverage' in the MoO3/ZrO2 dispersions
    Afanasiev, P
    [J]. MATERIALS CHEMISTRY AND PHYSICS, 1997, 47 (2-3) : 231 - 238
  • [2] Catalytic properties of pure and Ni doped niobium sulfide catalysts for hydrodesulfurization
    Allali, N
    Leblanc, A
    Danot, M
    Geantet, C
    Vrinat, M
    Breysse, M
    [J]. CATALYSIS TODAY, 1996, 27 (1-2) : 137 - 144
  • [3] SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF SIO2-ATTACHED ONE-ATOMIC-LAYER NIOBIUM OXIDE CATALYSTS
    ASAKURA, K
    IWASAWA, Y
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (04) : 1711 - 1716
  • [4] ESCA STUDIES OF THE SURFACE-CHEMISTRY OF ZEOLITES
    BARR, TL
    LISHKA, MA
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1986, 108 (12) : 3178 - 3186
  • [5] FROM BULK CEO2 TO SUPPORTED CERIUM OXYGEN CLUSTERS - A DIFFUSE REFLECTANCE APPROACH
    BENSALEM, A
    MULLER, JC
    BOZONVERDURAZ, F
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1992, 88 (01): : 153 - 154
  • [6] An X-ray photoelectron spectroscopy study of the acidity of SiO2-ZrO2 mixed oxides
    Bosman, HJM
    Pijpers, AP
    Jaspers, AWMA
    [J]. JOURNAL OF CATALYSIS, 1996, 161 (02) : 551 - 559
  • [7] INFLUENCE OF PREPARATION METHODS ON THE TEXTURE AND STRUCTURE OF TITANIA-SUPPORTED ON SILICA
    CASTILLO, R
    KOCH, B
    RUIZ, P
    DELMON, B
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 1994, 4 (06) : 903 - 906
  • [8] Characterization of molybdenum hydrodesulfurization catalysts supported on ZrO2-Al2O3 and ZrO2-SiO2 carriers
    Damyanova, S
    Petrov, L
    Centeno, MA
    Grange, P
    [J]. APPLIED CATALYSIS A-GENERAL, 2002, 224 (1-2) : 271 - 284
  • [9] Surface characterization of zirconia-coated alumina and silica carriers
    Damyanova, S
    Grange, P
    Delmon, B
    [J]. JOURNAL OF CATALYSIS, 1997, 168 (02) : 421 - 430
  • [10] EFFECT OF MIXED TITANIA-ALUMINA SUPPORTS ON THE PHASE-COMPOSITION OF NIMO/TIO2-AL2O3 CATALYSTS
    DAMYANOVA, S
    SPOJAKINA, A
    JIRATOVA, K
    [J]. APPLIED CATALYSIS A-GENERAL, 1995, 125 (02) : 257 - 269
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