Study of the Mechanism of Carbonization of Template in Silicon-Substituted Aluminophosphate Zeolite Crystals

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• 作者：Jian Pang Zhai ; Wei Wei Peng ; Irene Ling Li ; Shuang Chen Ruan ; Zi Kang Tang
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：August 7, 2008
• 年：2008
• 卷：112
• 期：31
• 页码：11702-11706
• 全文大小：190K
• 年卷期：v.112,no.31(August 7, 2008)
• ISSN：1932-7455

文摘

Silicon-substituted microporous aluminophosphate AlPO₄-11 zeolite crystals (SAPO-11) were synthesized by a hydrothermal method. The dipropylamine (DPA) molecules were incorporated in the one-dimensional channels of SAPO-11 as organic templates. The DPA molecules can be pyrolyzed at high temperature, and form 0.3 nm single-walled carbon nanotubes (SWNTs). The detailed carbonization process of DPA molecules has been investigated by using Fourier transform infrared measurements (FTIR), mass spectrometry, thermogravimeter (TG), and micro-Raman spectroscopy. During the pyrolysis process, the DPA molecules decompose into propylene and ammonia at 673 K, and then the C−H bonds of C₃H₆ start to break when temperature is above 698 K. The 0.3 nm SWNTs are formed sequentially in the channels of SAPO-11 crystals at about 723 K.