Highly selective synthesis of single-walled carbon nanotubes from methane in a coupled Downer-turbulent fluidized-bed reactor

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (4): 567-572.

Highly selective synthesis of single-walled carbon nanotubes from methane in a coupled Downer-turbulent fluidized-bed reactor

Song Yun, Weizhong Qian, Chaojie Cui, Yuntao Yu, Chao Zheng, Yi Liu, Qiang Zhang, Fei Wei

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2012-06-19 修回日期:2012-11-14 出版日期:2013-07-20 发布日期:2013-07-27
通讯作者: Weizhong Qian
基金资助:
This work was supported by the Chinese National Key Program (Grant No. 2011CB932602), Natural Science Foundation of China (Key Program, 51236004) and the Beijing Key Scientific Program (D12110300160000).

Highly selective synthesis of single-walled carbon nanotubes from methane in a coupled Downer-turbulent fluidized-bed reactor

Song Yun, Weizhong Qian, Chaojie Cui, Yuntao Yu, Chao Zheng, Yi Liu, Qiang Zhang, Fei Wei

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2012-06-19 Revised:2012-11-14 Online:2013-07-20 Published:2013-07-27
Supported by:
This work was supported by the Chinese National Key Program (Grant No. 2011CB932602), Natural Science Foundation of China (Key Program, 51236004) and the Beijing Key Scientific Program (D12110300160000).

摘要/Abstract

摘要： For the synthesis of single-walled carbon nanotubes (SWCNTs) from CH₄ over a Fe/MgO catalyst, we proposed a coupled Downer-turbulent fluidized-bed (TFB) reactor to enhance the selectivity and yield (or production rate) of SWCNTs. By controlling a very short catalyst residence time (1-3 s) in the Downer, only part of Fe oxides can be reduced to form Fe nano particles (NPs) available for the growth of SWCNTs. The percentage of unreduced Fe oxides increased and the yield of SWCNTs decreased accordingly with the increase of catalyst feeding rate in Downer. SWCNTs were preferentially grown on the catalyst surface and inhibited the sintering of the Fe crystallites which would be formed thereafter in the downstream TFB, evidenced by TEM, Raman and TGA. The coupled Downer-turbulent fluidized-bed reactor technology allowed higher selectivity and higher production rate of SWCNTs as compared to TFB alone.

关键词: carbon nanotube, chemical vapor deposition, methane, fluidized-bed, catalyst

Abstract: For the synthesis of single-walled carbon nanotubes (SWCNTs) from CH₄ over a Fe/MgO catalyst, we proposed a coupled Downer-turbulent fluidized-bed (TFB) reactor to enhance the selectivity and yield (or production rate) of SWCNTs. By controlling a very short catalyst residence time (1-3 s) in the Downer, only part of Fe oxides can be reduced to form Fe nano particles (NPs) available for the growth of SWCNTs. The percentage of unreduced Fe oxides increased and the yield of SWCNTs decreased accordingly with the increase of catalyst feeding rate in Downer. SWCNTs were preferentially grown on the catalyst surface and inhibited the sintering of the Fe crystallites which would be formed thereafter in the downstream TFB, evidenced by TEM, Raman and TGA. The coupled Downer-turbulent fluidized-bed reactor technology allowed higher selectivity and higher production rate of SWCNTs as compared to TFB alone.

Key words: carbon nanotube, chemical vapor deposition, methane, fluidized-bed, catalyst

Song Yun, Weizhong Qian, Chaojie Cui, Yuntao Yu, Chao Zheng, Yi Liu, Qiang Zhang, Fei Wei. Highly selective synthesis of single-walled carbon nanotubes from methane in a coupled Downer-turbulent fluidized-bed reactor[J]. 能源化学(英文), 2013, 22(4): 567-572.

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Highly selective synthesis of single-walled carbon nanotubes from methane in a coupled Downer-turbulent fluidized-bed reactor

Highly selective synthesis of single-walled carbon nanotubes from methane in a coupled Downer-turbulent fluidized-bed reactor

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