Kebin Zhou

Technical Institute of Physics and Chemistry, Peping, Beijing, China

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Publications (14)58.78 Total impact

  • Kebin Zhou, Yadong Li
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    ABSTRACT: Using bottom-up chemistry techniques, the composition, size, and shape in particular can now be controlled uniformly for each and every nanocrystal (NC). Research into shape-controlled NCs have shown that the catalytic properties of a material are sensitive not only to the size but also to the shape of the NCs as a consequence of well-defined facets. These findings are of great importance for modern heterogeneous catalysis research. First, a rational synthesis of catalysts might be achieved, since desired activity and selectivity would be acquired by simply tuning the shape, that is, the exposed crystal facets, of a NC catalyst. Second, shape-controlled NCs are relatively simple systems, in contrast to traditional complex solids, suggesting that they may serve as novel model catalysts to bridge the gap between model surfaces and real catalysts.
    Angewandte Chemie International Edition 12/2011; 51(3):602-13. · 13.73 Impact Factor
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    ABSTRACT: CeO(2) is a catalytic material of exceptional technological importance, and the precise role of oxygen vacancies is crucial to the greater understanding of these oxide materials. In this work, two ceria nanorod samples with different types and distributions of oxygen vacancies were synthesized. A direct relationship between the concentration of the larger size oxygen vacancy clusters and the reducibility/reactivity of nanosized ceria was revealed. These results may be an important step in understanding and designing active sites at the surface of metal oxide catalytic materials.
    Journal of the American Chemical Society 03/2009; 131(9):3140-1. · 10.68 Impact Factor
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    ABSTRACT: The size of the gold particles is a very important parameter to get active catalysts. This paper reports a novel colloidal deposition method to prepare Au/LaVO4 nanocomposite catalyst with monodispersed Au colloids and uniform LaVO4 nanoplates in nonpolar solvent. Monodispersed Au colloids with tunable size (such as 2, 5, 7, 11, 13, and 16 nm) and LaVO4 nanocrystals with well-defi ned shapes were pre-synthesized assisted with oleic acid/amine. During the following immobilization process, the particle size and shape of Au and LaVO4 were nearly preserved. As-prepared Au/LaVO4 nanocomposite showed high catalytic activity for CO oxidation at room temperature. Since sizes of gold particles were well-defi ned before the immobilization process, size effect of gold particles was easy to be investigated and the results show that 5-nm Au/LaVO4 nanocomposite has the highest activity for CO oxidation. This synthetic method can be extended further for the preparation of other composite nanomaterials.
    Nano Research 06/2008; 1(1):46-55. · 7.39 Impact Factor
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    ABSTRACT: Single-crystalline CeO2 nanocubes were synthesized through a hydrothermal treatment. By varying reaction temperature and the NaOH concentration, the size control of CeO2 nanocubes has been achieved, which produces the nanocubes with a controllable edge length in the regime of 20–360 nm. HRTEM studies reveal that the CeO2 nanocubes expose their high energy {001} planes. Consequently, it is demonstrated that the CeO2 nanocubes exhibit excellent reducibility and high oxygen storage capacity, indicating they are potential novel catalytic materials.
    Nanotechnology 04/2007; 18(18):185606. · 3.84 Impact Factor
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    Kebin Zhou, Zhiqiang Yang, Sen Yang
    Cheminform. 02/2007; 38(24).
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    ABSTRACT: CuO nanocrystals with different shapes, i.e. irregular nanoparticles, nanobelts and nanoplatelets, have been synthesized by controlling a few critical synthesis parameters to explore their catalytic properties. It was found that the rate of CO oxidation on the nanoplatelets is over six times higher than that on the nanoparticles and about three times higher than that on the nanobelts at 110 °C. Based on combined characterizations, such as BET, XRD, TEM, HRTEM and CO temperature-programmed reduction, the relationship between the catalytic reactivity and the shape as well as the predominantly exposed crystal planes of the CuO nanocrystals has been discussed.
    Nanotechnology 07/2006; 17(15):3939. · 3.84 Impact Factor
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    ABSTRACT: Pure-phase α-MnO2 and β-MnO2 nanowires/nanorods were synthesized through an easy solution-based hydrothermal method, and the effect of the manganese dioxide phase on the activity of MnO2 and Ag/MnO2 for the oxidation of CO was investigated. MnO2 is an effective catalyst in CO oxidation, and its activity depends on the crystal phase of MnO2. α-MnO2 exhibits a higher activity than β-MnO2, because the α-MnO2 nanowires can be reduced more easily than the β-MnO2 nanorods. Moreover, when Ag was introduced to MnO2, a strong interaction occurred between Ag and MnO2. The catalytic activity clearly correlates with this interaction, which is determined by crystal phase and surface structure.
    Journal of Catalysis. 01/2006; 237(2):426–430.
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    ABSTRACT: High-energy, more reactive {001} and {110} planes of CeO2 nanorods were found to generate favorable synergetic effects between CuO and ceria, resulting in significant enhancement of the copper catalyst performance for CO oxidation.
    Catalysis Letters 05/2005; 101(3):169-173. · 2.24 Impact Factor
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    ABSTRACT: The crystal plane of ceria plays an essential role in determining its catalytic oxidation properties. In this study, single-crystalline CeO2 nanorods with well-defined crystal planes have been synthesized by a facile solution-based hydrothermal method. HRTEM studies reveal that the predominantly exposed planes are the unusually reactive {001} and {110} in the CeO2 nanorods rather than the stable {111} in the irregular nanoparticles. Consequently, it is demonstrated that the CeO2 nanorods are more reactive for CO oxidation than their counterparts, irregular nanoparticles. The present results indicate that catalysts with well-defined reactive sites may be “designed” because of the recent development of morphology-controlled synthesis of nanostructured materials.
    Journal of Catalysis. 01/2005;
  • Angewandte Chemie International Edition 05/2004; 43(15):2017-20. · 13.73 Impact Factor
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    ABSTRACT: A modified citrate precursor technique is proposed for the preparation of porous ZnAl2O4. In this technique, ZnAl2O4 was obtained by calcination of a citrate precursor in N2 (0.5% O2) at 800°C, followed by annealing in air at 400°C. The ZnAl2O4 sample was characterized by X-ray diffraction, transition electron microscopy and surface area analyses (BET method), and the results showed that the ZnAl2O4 had a high surface area of 230m2/g and controllable particle size from 5nm to 20nm. A Pd/ZnAl2O4 catalyst prepared based on the porous ZnAl2O4 shows good catalytic activity, indicating that ZnAl2O4 as prepared is a promising catalyst support material.
    Journal of Alloys and Compounds 01/2004; 376(1):257-261. · 2.39 Impact Factor
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    ABSTRACT: A modified citrate precursor technique is proposed for the preparation of porous ZnAl2O4. In this technique, ZnAl2O4 was obtained by calcination of a citrate precursor in N2 (0.5% O2) at 800 °C, followed by annealing in air at 400 °C. The ZnAl2O4 sample was characterized by X-ray diffraction, transition electron microscopy and surface area analyses (BET method), and the results showed that the ZnAl2O4 had a high surface area of 230 m2/g and controllable particle size from 5 nm to 20 nm. A Pd/ZnAl2O4 catalyst prepared based on the porous ZnAl2O4 shows good catalytic activity, indicating that ZnAl2O4 as prepared is a promising catalyst support material.
    ChemInform 01/2004; 35(41).
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    ABSTRACT: Two types of catalysts with the same palladium loading, palladium-substituted perovskite (LaFe0.77Co0.17Pd0.06O3) and perovskite-supported palladium catalyst (Pd/LaFe0.8Co0.2O3) were prepared, and the effects of the preparation methods and reactant gas composition on the catalytic behaviors were investigated in detail. The catalyst structure was characterized by X-ray diffraction (XRD), transmission electron micrograph (TEM), temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) techniques. It was found that the excellent three-way catalytic activities could be obtained under slight rich conditions due to hydrocarbon steam reforming. The activity performance of Pd/LaFe0.8Co0.2O3 was higher than that of LaFe0.77Co0.17Pd0.06O3 and this was owing to the ease of reduction of palladium in the former.
    Journal of Molecular Catalysis A-chemical - J MOL CATAL A-CHEM. 01/2002; 189(2):225-232.
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    ABSTRACT: Pd/LaFe0.8Co0.2O3 was found to be more active than the Pd/Al2O3 catalyst in propane oxidation. Activity and the oxidation state of palladium were strongly affected by the redox ratio (S) of reactants. Higher propane conversion could be obtained under rich conditions at higher temperatures, contributing to steam reforming. The presence of excess steam would bring about inhibition and oscillation.
    Reaction Kinetics and Catalysis Letters 01/2002; 77(1). · 0.93 Impact Factor

Publication Stats

222 Citations
11 Downloads
656 Views
58.78 Total Impact Points

Institutions

  • 2008–2011
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China
  • 2004–2006
    • Tsinghua University
      • Department of Chemistry
      Beijing, Beijing Shi, China
  • 2002
    • Northeast Institute of Geography and Agroecology
      • Research Center for Eco-Environmental Sciences
      Peping, Beijing, China