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学科主题: 物理化学
题名: Reactions over catalysts confined in carbon nanotubes
作者: Pan XL(潘秀莲) ;  Bao XH(包信和)
会议名称: 10th International Conference on the Science & Application Nanotubes
会议日期: 2009-6-21
出版日期: 2009-06-21
会议地点: 中国
通讯作者: 包信和
部门归属: 五室
主办者: 清华大学
摘要: In the present presentation, the unique characters of catalysis with the nano-confined system will be demonstrated, and the emphasis will be laid on the electron properties derived from the quatum will states in the nano-systems and the synergetic confinement effects between the encapsulated metallic nanoparticle and 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 nanocompoiste materials with interesting properties or behavior different from the bulk. In the present talk, two unique properties concerning the redox and catalysis of the CNT0encapsulated metals and metal oxides will be addressed. The autoreduction of the encapsulated Fe2O3 is significantly facilitaded inside CNTs with respect to the outside nanoparticles, and it becomes more facile with decreasing CNT channel diameter as evidenced 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 particles as shown by in situ XRD and gravimetrical measurements with an 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 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 encapsulates with the interior CNT surface. In the same way, a distinct enhancement of the CNT encapsulated Fe species to the F-T process has also been revealed, which is attributed the favourable formation of the reduced iron species, e.g. iron carbides, inside the channel of CNTs. The results have been highlighted by C&E News and Nature China, respectively.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/113506
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:
Pan XL,Bao XH. Reactions over catalysts confined in carbon nanotubes[C]. 见:10th International Conference on the Science & Application Nanotubes. 中国. 2009-6-21.
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