DICP OpenIR
学科主题物理化学
Catalysis Chemistry of the Confined Nano-Systems
Bao XH(包信和)
会议名称XXIInd International Winterschool on Elextronic Properties of Novel Materials
会议日期2008-3-1
2008-03-01
会议地点奥地利
页码111/1
部门归属五室
主办者柏林自由大学
英文摘要This talk will be focused on the application of nano-related science and technololgy in the fields of catalysis, with an emphasis on the electron properties of the confined systems ans the synergetic confinement effects between the wmcapsulated metallic nanoparticle and carbon nanotubes.(1) The effect of electron quantum confinement on the catalytic activities of 2D ultra-thin metal films if explored by comparing the work function change and initial reaction rate of atuomically flat films of different thickness on silicon surfaces, using complementary microscoppy and spectroscopy techniques. The obvious oscillations of the oxidation rate of lead films are observed, which are attributed to be a manifestation of the FabryPerot interference modes of electron de Broglie waves(quamtum will states) in the films. The modulation fo 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 have will defined hollow interiors and wxhibit unusual mechanical and thermal stability as well as electron condubtivity. This opens tintriguing possiblities to introduce other matter into the cavities, which may lead to nanocomposite materials with interesting properties or behaviour different from the buld. In the present talk, two unique properties concerning the redox and catalysis of the CNT-encapsulated metals and metal oxides will addressed. The autoreduction fo 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 evidencd by temperature programmed reaction, in situ XRD and Raman spectroscopy. The oxidation of encapsulated metallic Fe nanoparicles on the other hand is retarded in comparison to that of the outside Fe particles as shown by in situ XRD and gravimetrical measurements with an online microbalance. A striking enhancement of the catalystic activity of Rh particles confined inside nanotubes for the conversion of CO and H2 to ethanol has been found. The overall formation rate of ethanol inside nanotubes exceeds that on the outside of the nanotubes by more than an order of magnitude, although the latter is much better accessible. We attribute these unique behaviours of transition metal nanoparticles inside CNTs to a particular electronic interaction of the encapsulates with the interior CNT surface.
语种中文
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/113038
专题中国科学院大连化学物理研究所
通讯作者Bao XH(包信和)
推荐引用方式
GB/T 7714
Bao XH. Catalysis Chemistry of the Confined Nano-Systems[C],2008:111/1.
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