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Nonaqueous synthesis, characterization and catalytic activity of ceria nanorods

机译：二氧化铈纳米棒的非水合成，表征和催化活性

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摘要

Large-scale ceria nanorods with high surface area and good crystallization were prepared via a facile nonaqueous process without any surfactants. The results of N_2 adsorption/desorption showed that CeO_2 nanorods possessed large pore volume, which was about 7-fold of that in conventionally synthesized CeO_2 nanoparticles. TEM images revealed the exposure of more reactive {200} and {220} planes, consistent with the favorable formation of more oxygen vacancies on the surface, as confirmed by XPS and O_2-TPD. TPR results demonstrated that low temperature reducibility (max. at 334 ℃) maintained after reduction-oxidation cycles and even after heat treatment at 900 ℃, indicating the strong stability of surface active oxygen species. Based on time-dependent morphology evolution of as-prepared precursor, the formation mechanism of nanorod structure was proposed. Furthermore, catalytic performance of CeO_2 nanorods in methane combustion was investigated and compared with that of CeO_2 nanoparticles.
机译：通过简便的非水工艺，无需任何表面活性剂即可制备出具有高表面积和良好结晶度的大型二氧化铈纳米棒。 N_2吸附/解吸的结果表明，CeO_2纳米棒具有较大的孔体积，约为常规合成的CeO_2纳米颗粒的7倍。 TEM图像揭示了更多的反应性{200}和{220}平面的暴露，这与XPS和O_2-TPD证实在表面上有利地形成更多的氧空位相一致。 TPR结果表明，还原氧化循环后甚至在900℃热处理后，仍保持低温还原性（最高334℃），表明表面活性氧具有很强的稳定性。基于制备的前驱物随时间的形态演化，提出了纳米棒结构的形成机理。此外，研究了CeO_2纳米棒在甲烷燃烧中的催化性能，并与CeO_2纳米颗粒进行了比较。

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  • 来源
    《Materials Chemistry and Physics》 |2012年第3期|912-920|共9页
  • 作者

    Mingjuan Sun; Guojun Zou; Shan Xu; Xiaolai Wang;

  • 作者单位

    State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China,Graduate University of the Chinese Academy of Sciences, Beijing 10039, PR China;

    State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;

    State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;

    State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    oxides; chemical synthesis; electron microscopy; oxidation;

    机译：氧化物化学合成电子显微镜;氧化;

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