Formation mechanism of 0.4-nm single-walled carbon nanotubes in A1PO(4)-5 crystals by low-temperature hydrocracking

doi:10.1016/j.carbon.2017.01.008

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	Formation mechanism of 0.4-nm single-walled carbon nanotubes in A1PO(4)-5 crystals by low-temperature hydrocracking
	Yang, Wenshen; Lang, Lin; Yin, Xiuli; Wu, Chuangzhi
刊名	CARBON
	2017-05-01
卷号	115 页码:120-127
关键词	Single-walled Carbon Nanotubes Hydrocracking Alpo4-5 Crystals Radial Breathing Mode
DOI	10.1016/j.carbon.2017.01.008
文献子类	Article
英文摘要	The carbonization mechanism of tripropylamine (TPA) in low-temperature hydrocracking was studied with the aim of increasing the quality and filling density of single-walled carbon nanotubes (SWCNTs) produced in the channels of AlPO4-5 crystals. The conversion process of TPA was investigated using a combination of Fourier transform infrared spectroscopy, mass spectrometry, C-13 nuclear magnetic resonance spectroscopy, thermogravimetric analysis and micro-Raman spectroscopy at various hydro cracking temperatures. During the hydrocracking process, hydrogen participated in the cracking reaction of TPA and decreased the required activation energy. The protonated TPA converted into neutral TPA at 210 degrees C. When the hydrocracking temperature exceeded 260 degrees C, dipropylamine, n-propylamine, propylene, propane, ethane and methane were produced. The hydrocracking rate of TPA increased with increasing hydrocracking temperature. A small amount of aromatic compounds was also detected in the A1PO(4)-5 crystals hydrocracked at 280-350 degrees C; this amount decreased with increasing hydrocracking temperature. The content of residual TPA and amorphous carbon compounds in the AlPO4-5 crystals also decreased with increasing hydrocracking temperature. TPA decomposed completely after hydrocracking for 10 h at 350 degrees C. SWCNTs with a diameter of 0.4 nm were synthesized at 280-350 degrees C, and the filling density of SWCNTs increased with increasing hydrocracking temperature. (c) 2017 Elsevier Ltd. All rights reserved.
WOS关键词	MOLECULAR-SIEVES ; ALPO4-5 CRYSTAL ; CHANNELS ; GROWTH
语种	英语
WOS记录号	WOS:000395601300014
资助机构	National Natural Science Foundation of China(51106165 ; Guangdong Natural Science Foundation(S2013010014896 ; 51202245) ; 10251007006000000)
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/14097]
专题	中国科学院广州能源研究所
作者单位	Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Yang, Wenshen,Lang, Lin,Yin, Xiuli,et al. Formation mechanism of 0.4-nm single-walled carbon nanotubes in A1PO(4)-5 crystals by low-temperature hydrocracking[J]. CARBON,2017,115:120-127.
APA	Yang, Wenshen,Lang, Lin,Yin, Xiuli,&Wu, Chuangzhi.(2017).Formation mechanism of 0.4-nm single-walled carbon nanotubes in A1PO(4)-5 crystals by low-temperature hydrocracking.CARBON,115,120-127.
MLA	Yang, Wenshen,et al."Formation mechanism of 0.4-nm single-walled carbon nanotubes in A1PO(4)-5 crystals by low-temperature hydrocracking".CARBON 115(2017):120-127.