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学科主题: 物理化学
题名: Concept and Practices of Catalysis with Nano-Confined Systems
作者: Bao XH(包信和)
会议名称: International Symposium on Concerto Catalysis
会议日期: 2008-4-17
出版日期: 2008-04-17
会议地点: 日本
通讯作者: Xinhe Bao
部门归属: 五室
主办者: 东京大学
摘要: The presentation will be focused on the fundament and application of nano-related science and technology in the fields of catalysis, with an emphasis on the electron properties of the confined systems and the synergetic confinement effects between the encapsulated metallic nanoparticles inside carbon nanotubes as well as the effect of quantum well states at 2D nano-film. (1) The effect of electron quantum confinement on the catalytic activities of 2D ultra-thin metal films is explored by comparing the work function change and the initial reaction rate of atomically flat films of different thickness on silicon surfaces, using complementary microscopy and spectroscopy techniques. The obvious oscillations of the oxidation rate of lead films are observed, which are attributed to be a manifestation of the Fabry-Pe´rot interference modes of electron de Broglie waves (quantum well states) in the films. The modulation of the electron density of states near the Fermi level opens a new demission for tuning the catalytic performance of metal systems via size- and thickness-dependent quantum size effects, which will be illustrated through two examples.(2) Carbon nanotubes (CNTs) have well defined hollow interiors and exhibit unusual mechanical and thermal stability as well as electron conductivity. This opens intriguing possibilities to introduce other matter into the cavities, which may lead to nanocomposite materials with interesting properties or behavior different from the bulk. Two unique properties concerning the redox and catalysis of the CNT-encapsulated metals and metal oxides have been recognized. The auto-reduction of the encapsulated Fe2O3 is significantly facilitated inside CNTs with respect to the outside nanoparticle, and it becomes more facile with decreasing CNT channel diameter as evidenced by temperature programmed reaction. A striking enhancement of the catalytic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol has been found. These unique behaviors of transition metal nanoparticles inside CNTs have been attributed to a particular electronic interaction of encapsulates with the interior CNT surface.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/112902
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Bao XH. Concept and Practices of Catalysis with Nano-Confined Systems[C]. 见:International Symposium on Concerto Catalysis. 日本. 2008-4-17.
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