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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
2017-05-01
Source PublicationCARBON
Volume115Pages:120-127
AbstractThe 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.
SubtypeArticle
KeywordSingle-walled Carbon Nanotubes Hydrocracking Alpo4-5 Crystals Radial Breathing Mode
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.carbon.2017.01.008
WOS Subject ExtendedChemistry ; Materials Science
WOS KeywordMOLECULAR-SIEVES ; ALPO4-5 CRYSTAL ; CHANNELS ; GROWTH
Indexed BySCI
Language英语
Funding OrganizationNational Natural Science Foundation of China(51106165 ; Guangdong Natural Science Foundation(S2013010014896 ; 51202245) ; 10251007006000000)
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000395601300014
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/14097
Collection中国科学院广州能源研究所
AffiliationChinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
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.
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