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学科主题: 物理化学
题名: NanoCatalysis: A New Chemistry of the Confined Nano-Systems
作者: Bao XH(包信和)
会议名称: BASF Conference on Nanomaterials
会议日期: 2007-10-21
出版日期: 2007-10-21
会议地点: 新加坡
通讯作者: 包信和
部门归属: 五室
主办者: 巴斯夫公司
摘要: This talk will be focused mainly on the application of nano-related science and technology in the fields of catalysis, with an emphasis on the synergetic confinement effects between the encapsulated metallic nanoparticle and the carbon nanotubes. 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 behaviour different from the bulk. In the present talk, two unique properties concerning the redox and catalysis of the CNT-encapsulated metals and metal oxides will be addressed. The autoreduction of the encapsulated Fe2O3 is significantly facilitated inside CNTs with respect to the outside nanoparticles, and it becomes more facile with decreasing CNT channel diameter as evidences by temperature programmed reaction, in situ XRD and Raman spectroscopy. The oxidation of encapsulated metallic Fe nanoparticles on the other hand is retarded in comparison to that of the outside Fe particle as shown by in situ XRD and gravimetrical measurements with and online microbalance. 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. The overall formation rate of ethanol( 84 mol pre mol Rh and pre hour) 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 behaviors'' of transition metal nanoparticles inside CNTs to a particular electronic interaction of the 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/321008/112728
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. NanoCatalysis: A New Chemistry of the Confined Nano-Systems[C]. 见:BASF Conference on Nanomaterials. 新加坡. 2007-10-21.
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