Synthesis of High-Quality, Double-Walled Carbon Nanotubes in a Fluidized Bed Reactor

被引：36

作者：

Liu, Yi ^{[1
]}

Qian, Weizhong ^{[1
]}

Zhang, Qiang ^{[1
]}

Ning, Guoqing ^{[1
]}

Luo, Guohua ^{[1
]}

Wang, Yao ^{[1
]}

Wang, Dezheng ^{[1
]}

Wei, Fei ^{[1
]}

机构：

[1] Tsinghua Univ, Beijing Key Lab Green Chem React Engn & Technol, Dept Chem Engn, Beijing 100084, Peoples R China

来源：

CHEMICAL ENGINEERING & TECHNOLOGY | 2009年 / 32卷 / 01期

关键词：

Carbon nanotubes; Catalysts; Chemical vapor deposition; Fluidized beds; Hydrogen effect; CHEMICAL-VAPOR-DEPOSITION; FORMATION MECHANISM; POROUS CATALYSTS; METAL PARTICLES; GROWTH; CVD; METHANE; MGO;

D O I：

10.1002/ceat.200800298

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Double-walled carbon nanotubes (DWCNTs) were synthesized in a packed bed reactor (PBR) and a fluidized bed reactor (FBR) by cracking CH4 oil a Fe/MgO catalyst. It is observed that the dominant carbon product changes drastically from DWCNTs to multi-walled CNTs along the axial direction of PBR. The studies indicated that the high concentration of H-2 from the high conversion of CH4 causes the quick reduction and sintering of the iron catalyst and inhibits the nucleation of DWCNTs. Based on these results, the batch or continuous feeding mode of small amounts of catalyst was adopted in a FBR to maintain a high space velocity of CH4 and to inhibit the negative effect of excess H-2. Finally, a DWCNT product with a specific surface area of 950 m(2)/g and a purity of 98 %, was obtained.

引用

页码：73 / 79

页数：7

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