Influencing Factors on Formation of SWCNTs in the Channels of AFI Molecular Sieves by Low-temperature Hydrocracking

doi:10.11901/1005.3093.2016.438

Chinese Journal of Materials Research

2017, Vol. 31

Issue (6): 401-409 DOI: 10.11901/1005.3093.2016.438

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Influencing Factors on Formation of SWCNTs in the Channels of AFI Molecular Sieves by Low-temperature Hydrocracking

Wenshen YANG,Lin LANG,Xiuli YIN(

),Chuangzhi WU

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China

Cite this article:

Wenshen YANG,Lin LANG,Xiuli YIN,Chuangzhi WU. Influencing Factors on Formation of SWCNTs in the Channels of AFI Molecular Sieves by Low-temperature Hydrocracking. Chinese Journal of Materials Research, 2017, 31(6): 401-409.

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Abstract

AFI (AlPO₄-5, CoAPO-5, SAPO-5, CrAPO-5, FeAPO-5 and MnAPO-5) molecular sieves were synthesized by hydrothermal method, and then single-walled carbon nanotubes (SWCNTs) with a diameter of 0.4 nm were prepared in the channels of these kind molecular sieves by low-temperature hydrocracking. The effect of the type and the amount of active metals, the hydrocracking temperature and the carbon content of template agents was investigated by means of XRD, NH₃-TPD and micro-Raman spectroscopy. The results show that the addition of Si or active metal can improve the quantities of acid sites in the AFI molecular sieves, which can improve the density and quality of the SWCNTs in the channels of the hydrocracked AlPO4-5 molecular sieves. Besides, the hydrocracking temperature and the carbon content of template agents are also key influence factors for the preparation of SWCNTs.

Key words: inorganic non-metalic materials AFI molecular sieves SWCNTs IRBM/IG low-temperature hydrocracking

Received: 25 July 2016

Fund: Supported by National Natural Science Foundation of China (No.51661145022) and Guangdong Provincial Science and Technology Plan Project (No.2016A010104011)

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	Wenshen YANG
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	Chuangzhi WU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.438 OR https://www.cjmr.org/EN/Y2017/V31/I6/401

Fig.1 Schematic diagram of the apparatus for SWCNTs preparation via low-temperature hydrocracking

Table 1 Synthetic compositions of the AFI molecular sieves and the final products analysis

Fig.2 XRD patterns of the synthesized molecular sieves (1) AlPO₄-5 (TEA); (2) AlPO₄-5 (TPA); (3) SAPO-5 (TEA); (4) CrAPO-5 (TEA, Cr/Al=0.0375); (5) MnAPO-5 (TEA, Mn/Al=0.0375); (6) FeAPO-5 (TEA, Fe/Al=0.0375); (7) CoAPO-5 (TEA, Co/Al=0.0375)

Fig.3 Raman spectrum of the SWCNTs in the samples hydrocracked at 350℃ (1) AlPO₄-5 (TEA); (2) SAPO-5 (TEA); (3) CoAPO-5 (TEA,Co/Al=0.0375); (4) FeAPO-5 (TEA,Fe/Al=0.0375); (5) MnAPO-5 (TEA, Mn/Al=0.0375); (6) CrAPO-5 (TEA, Cr/Al=0.0375); (7) AlPO₄-5 (TPA)

Fig.4 XRD patterns of the synthesized CoAPO₄-5 (TEA) and FeAPO₄-5 (TEA) molecular sieves: (1) Co/Al=0.0375; (2) Co/Al=0.075; (3) Co/Al=0.1; (4) Co/Al=0.15; (5) Fe/Al=0.0375; (6) Fe/Al=0.075; (7) Fe/Al=0.1; (8) Fe/Al=0.15

Fig.5 Raman spectrum of the SWCNTs in the channels of CoAPO₄-5 (TEA) and FeAPO₄-5 (TEA) crystals hydrocracked at 350℃ (1) Co/Al=0.0375; (2) Co/Al=0.075; (3) Co/Al=0.1; (4) Co/Al=0.15; (5) Fe/Al=0.0375; (6) Fe/Al=0.075; (7) Fe/Al=0.1; (8) Fe/Al=0.15

Table 2 Normalized integrated intensities of the Raman bands of SWCNTs prepared in the channels of different AFI crystals

Fig.6 NH₃-TPD curves of CoAPO-5 molecular sieves (1) Co/Al=0; (2) Co/Al=0.0375; (3) Co/Al=0.075; (4) Co/Al=0.1; (5) Co/Al=0.15

Fig.7 Raman spectra of SWCNTs in AlPO₄-5 (TEA) and AlPO₄-5 (TPA) crystals hydrocracked at various temperatures (1) AlPO₄-5 (TEA, 280℃), (2) AlPO₄-5 (TEA, 300℃), (3) AlPO₄-5 (TEA, 320℃), (4) AlPO₄-5 (TEA, 350℃), (5) AlPO₄-5 (TEA, 400℃), (6) AlPO₄-5 (TPA, 280℃) (7) AlPO₄-5 (TPA, 300℃), (8) AlPO₄-5 (TPA, 320℃), (9) AlPO₄-5 (TPA, 350℃) and (10) AlPO₄-5 (TPA, 400℃)

Table 3 Normalized integrated intensities of the Raman bands of SWCNTs prepared in the channels of CoAPO₄-5 and FeAPO₄-5 crystals with different Co/Al or Fe/Al ratio

Table 4 Normalized integrated intensities of the Raman bands of SWCNTs prepared in the channels of AlPO₄-5 (TEA) and AlPO₄-5 (TPA) crystals hydrocracked at 280, 300, 320, 350 and 400℃

[1]	Iijima S.Growth of carbon nanotubes[J]. Mat. Sci. Eng. B, 1993, 19(1): 172
[2]	Awasthi K, Srivastava A, Srivastava O J.Synthesis of carbon nanotubes[J]. J. Nanosci. Nanotechnol., 2005, 10: 1616
[3]	Azam M A, Manaf N S A, Taalib E, et al. Aligned carbon nanotube from catalytic vapor deposition technique for energy storage device: a review[J]. Ionics, 2013, 11: 1455
[4]	Tan L L, Ong W J, Chai S P, et al.Growth of carbon nanotubes over non-metallic based catalysts: a review on the recent developments[J]. Catal. Today., 2013, 217: 1
[5]	Guo T, Nikolaev P, Thess A, et al.Catalytic growth of single-walled nanotubes by laser vaporation[J]. Chem. Phys. Lett., 1995, 243: 49
[6]	Ebbesen T W, Ajayan P M.Large-scale synthesis of carbon nanotubes[J]. Nature, 1992, 358: 220
[7]	Ivanov V, Nagy J B, Lambin P, et al.The study of carbon nanotubes produced by catalytic method[J]. Chem. Phys. Lett., 1994, 223: 329
[8]	Tang Z K, Sun H D, Wang J, et al.Mono-sized single-wall carbon nanotubes formed in the channels of AlPO4-5 single crystals[J]. Appl. Phys. Lett., 1998, 73: 2287
[9]	Wang Z, Shi W, Lortz R, et al.Superconductivity in 4-angstrom carbon nanotubes-a short review[J]. Nanoscale, 2012, 4: 21
[10]	Zhang T, Sun M Y, Wang Z, Shi W, Sheng P.Crossover from Peierls distortion to one-dimensional superconductivity in arrays of (5, 0) carbon nanotubes[J]. Phys. Rev. B., 2011, 84: 245
[11]	Xu R R, Pang W Q.Chemistry-zeolites and Porous Materials[M]. Beijing: Beijing Science Press, 2004
[11]	(徐如人, 庞文琴. 分子筛与多孔材料化学 [M]. 北京: 北京科学出版社, 2004)
[12]	Zhai J P, Tang Z K, Hu X J, et al.Catalytic growth of 0.4 nm single-walled carbon nanotubes aligned inside porous zeolite crystals[J]. Phys. Stat. Sol (b)., 2006, 243: 3082
[13]	Yang W S, Liu X F, Zhang L, et al.In situ synthesis and microstructure manuipulation of SAPO-5 films over Porous α-Al2O3 substrates[J]. Langmuir, 2009, 25(4): 271
[14]	Li Z M, Zhai J P, Liu H J, et al.Synthesis of 4 ? single-walled carbon nanotubes in catalytic Si-substituted AlPO4-5 molecular sieves[J]. Appl. Phys. Lett., 2004, 85(7): 1253
[15]	Zhai J P, Li Z M, Liu H J, et al.Catalytic effect of metal cations on the formation of carbon nanotubes inside the channels of AlPO4-5 crystal[J]. Carbon, 2006, 44: 1151
[16]	Zhai J P, Tang Z K, Li Z M, et al.Carbonization of mechanism of Tetrapropylammonium-hydroxide in channels of AlPO4-5 single crystals[J]. Chem. Mater., 2006, 18: 1505
[17]	Chen Q H, Wang Z, Zheng Y, et al.New developments in the growth of 4 Angstrom carbon nanotubes in linear channels of zeolite template[J]. Carbon, 2014, 76: 401
[18]	Li G D, Tang Z K, Wang N, et al.Structural study of the 0.4 nm single-wall carbon nanotubes aligned in channels of AlPO4-5 crystal[J].Carbon, 2002, 40: 917
[19]	Yang W S, Sun W N, Zhao S H, et al.Single-walled carbon nanotubes prepared in small AlPO4-5 and CoAPO-5 molecular sieves by low-temperature hydrocracking[J]. Micropor. Mesopor. Mat., 2016, 219: 87
[20]	Fan W B, Li R F, Dou T, et al.Solvent effects in the synthesis of CoAPO-5, -11 and -34 molecular sieves[J]. Micropor. Mesopor. Mat., 2005, 84: 116
[21]	Hochtl M, Jentys A, Vinek H.Acidity of SAPO and CoAPO molecular sieves and their activity in the hydroisomerization of n-heptane[J]. Micropor. Mesopor. Mat., 1999, 31(3): 271

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