DICP OpenIR
Subject Area物理化学
Reactions over catalysts confined in carbon nanotubes
Pan XL(潘秀莲); Bao XH(包信和)
Conference Name10th International Conference on the Science & Application Nanotubes
Conference Date2009-6-21
2009-06-21
Conference Place中国
Pages56/1
Department五室
Funding Organization清华大学
AbstractIn 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.
Language中文
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/113506
Collection中国科学院大连化学物理研究所
Corresponding AuthorBao XH(包信和)
Recommended Citation
GB/T 7714
Pan XL,Bao XH. Reactions over catalysts confined in carbon nanotubes[C],2009:56/1.
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