Formation mechanism of 0.4-nm single-walled carbon nanotubes in A1PO4-5 crystals by low-temperature hydrocracking

被引：5
|
作者：
Yang, Wenshen [1 ]
Lang, Lin [1 ]
Yin, Xiuli [1 ]
Wu, Chuangzhi [1 ]
机构：
[1] Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
来源：
CARBON | 2017年 / 115卷
基金：
中国国家自然科学基金;
关键词：
Single-walled carbon nanotubes; Hydrocracking; AlPO4-5; crystals; Radial breathing mode; MOLECULAR-SIEVES; ALPO4-5; CRYSTAL; CHANNELS; GROWTH;
D O I：
10.1016/j.carbon.2017.01.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
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.
引用
收藏
页码：120 / 127
页数：8
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