Carbon nanotube templated growth of nano-crystalline ZSM-5 and NaY zeolites

Tang, Kangjian; Wang, Y.G.; Song, Lili; Duan, Linhai; Zhang, X.T.; Sun, Zhijia

doi:10.1016/j.matlet.2005.12.088

Cited by 35 publications

(23 citation statements)

References 8 publications

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“…The as-synthesized beta zeolite aggregate was discovered to be composed of smaller primary particles with the sizes of about 10-20 nm [13]. In others, imprisoned materials such as multiwall carbon nanotubes as well as carbon matrix and carbon aerogels with a mesopore system were effectively used to confine and block the growth of zeolite crystals [14][15][16][17][18][19][20][21], in which zeolite crystals nucleated and were confined to grow within the one-dimensional or three-dimensional mesoporous system. And removal of the template would lead to a hierarchical zeolite composed of nano-sized zeolite crystals [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the dimension of crystalline grain was adjusted by controlling the mesoporous diameter in the imprisoned materials. For example, nano-sized ZSM-5 zeolite was reported to be synthesized inside the mesopores of CNTS so the crystal size was controlled and adjusted by controlling the diameter of the mesoporous CNTS [21]. Moreover, Tao et al [17][18][19][20] reported a method of preparing meso-zeolite by using carbon aerogel with uniform mesopores as the templates, in which zeolites nucleated and were confined to grow within the three-dimensional mesoporous system, and the crystalline dimension was controlled and adjusted by the mesoporous diameter in the carbon aerogel templates.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

et al. 2016

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A hierarchical ZSM-5 zeolite composed of nanosized MFI zeolite crystals was synthesized without using secondary template by a traditional hydrothermal procedure. The as-synthesized hierarchical ZSM-5 and a reference catalyst were both characterized by XRD, SEM, FT-IR, in situ infrared (IR) spectrometry of pyridine, NH 3 -TPD, N 2 adsorption-desorption, intelligent gravimetric analyzer, and by thermogravimetry analyses. After examining and comparing the results, it is discovered that the hierarchical ZSM-5 catalyst displays excellent catalytic performance with an improved conversion of isopropylbenzene and a longer catalytic life because of its dramatically enlarged external surfaces. The results also display that the shortened diffusion path length contributes to enhancing the stability of the hierarchical catalyst by depressing the coking deposit during the catalytic cracking of n-octane.Graphical Abstract A wool-ball-like zeolite composed of nano-sized MFI crystals was synthesized without a secondary template by the traditional hydrothermal procedure. Nanocrystallization of crystal particles in the hierarchical ZSM-5 zeolite gives the catalyst an improved diffusion and a dramatically enhanced external surface which contributes to elevating pre-cracking of large molecules and catalytic longevity, and to offering a potential and high-efficiency FCC catalyst component.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

et al. 2016

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“…Qui et al [24] found the same results for nonporous carbon nitride materials. The bands at 1,256, 1,321, and 1,427 cm -1 are related to the aromatic C-N stretching mode, whereas the band at approximately 1,571 cm -1 is attributed to the aromatic ring mode [16,27,28].…”

Section: Xrdmentioning

confidence: 97%

“…Because carbonization in the mesopores leads to a thick carbon coat that is stable, no structural transformation occurs upon removal of the silica wall. However, in the case of microporous templates such as FAU-CN and also more closed structures, such as that seen for MCM-22, the carbon framework loses the structural order after silica removal [8,16]. Consequently, the Sg of the microporous carbon sieves decreases drastically, while the textural parameters of the mesoporous carbon sieves experience a slight decrease.…”

Section: Textural Propertiesmentioning

confidence: 99%

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High Catalytic Activity of Nitrogen-Containing Carbon from Molecular Sieves in Fine Chemistry

et al. 2009

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Nanostructured nitrogen-containing carbon (CNs) were prepared by nanocasting techniques using MCM-41, MCM-22, and FAU molecular sieves. The surface and morphological features of CN were investigated by XRD, SEM, Raman spectroscopy, FTIR, XPS, and N 2 adsorption isotherms. The catalytic activity in a fine chemistry reaction was also evaluated. The amine-functionalized carbon materials studied are potentially of great importance because of their textural features and high catalytic performance towards Knoevenaguel condensation. In addition, variation of the structure of the molecular sieve material from FAU to MCM-41 led to an increase in the conversion from 23 to 80%. This may be correlated to the basic active sites upon incorporation of nitrogen and also an organized CN that provides active, selective, and stable catalysts to the target reaction. The re-use of the MCM-41-CN does not affect the selectivity of the desired product.

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Nano‐Microporous Materials: Hydrothermal Synthesis of Zeolites

Valtchev

Mintova

2005

Encyclopedia of Inorganic Chemistry

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This review focuses on the synthesis, crystallization mechanism, and crystal engineering of silica‐based zeolites. The introduction section provides a brief historical overview of zeolite synthesis and points out the main families of microporous solids. The main body of the article comprises two interrelated parts. The first presents basic information related to the zeolite crystallization, namely, (i) the key constituents of a zeolite‐yielding system; (ii) the reactions upon the action of mineralizing agent (OH − and F − ); and (iii) the fundamentals of zeolite crystallogenesis. Emphasis is laid on the nucleation process, which is still not well understood. New insights into the zeolite nucleation gained by using colloidal and dense gel systems are discussed. The second part of the survey deals with in situ zeolite crystal engineering. Initially, the synthesis of nanosized particles is considered and then methods for the growth of large, at least 50 µm, zeolite crystals are presented. Further, the control of the crystal morphology via fine tuning of the synthesis variables is discussed. Hybrid zeolites obtained by grafting of organic functionalities during the crystallization reaction are also reviewed. Finally, methods for the synthesis of zeolites with hierarchical porosity are illustrated. This part is subdivided into two sections presenting polycrystalline hierarchical porous structures and single mesopore–containing zeolite crystals.

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Carbon nanotube templated growth of nano-crystalline ZSM-5 and NaY zeolites

Cited by 35 publications

References 8 publications

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

Synthesis of Wool-Ball-Like ZSM-5 with Enlarged External Surfaces and Improved Diffusion: A Potential Highly-Efficient FCC Catalyst Component for Elevating Pre-cracking of Large Molecules and Catalytic Longevity

High Catalytic Activity of Nitrogen-Containing Carbon from Molecular Sieves in Fine Chemistry

Nano‐Microporous Materials: Hydrothermal Synthesis of Zeolites

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