One-pot synthesis of hierarchically structured ZSM-5 zeolites using single micropore-template

Ge, Tongguang; Hua, Zile; He, Xiaoyun; Zhu, Yan; Ren, Weina; Chen, Li‐Song; Zhang, Lingxia; Chen, Hangrong; Lin, Chucheng; Yao, Heliang; Shi, Jianlin

doi:10.1016/s1872-2067(14)60263-1

Cited by 22 publications

(8 citation statements)

References 35 publications

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“…2B) taken at the edge of the HA-ZSM-5 sample, indicating that HA-ZSM-5 zeolites are completely crystalline. 22 The dot pattern of selected area electron diffraction (SAED) of the corresponding HA-ZSM-5 zeolite indicates the single crystalline nature of these nanocrystals ( Fig. 2C), which demonstrates that the introduction of mesopores maintains the single crystal integrity.…”

Section: Morphology Observation and Controlmentioning

confidence: 93%

“…21 Different from LACSs, short alkyl-chained surfactants (SACSs), such as n-hexyltrimethylammonium bromide (HTAB), have strong coulombic interactions toward the zeolite crystals and good thermal stability under high temperature and high pressure conditions. 22 These interactions with nanocrystals may hinder their excessive growth and the stacking of the resulting nano-sized zeolites will form HA-ZSM-5. 23 From an economic and synthetic perspective, it prompted us to try using SACSs to synthesize high silica HA-ZSM-5 with controllable morphologies.…”

Section: Introductionmentioning

confidence: 99%

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Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Wang

Meng

et al. 2017

RSC Adv.

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Section: Morphology Observation and Controlmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Wang

Meng

et al. 2017

RSC Adv.

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“…The mesoporous ZSM-5 zeolites with improved diffusion efficiency and acids accessibility showed better performance than the conventional ZSM-5 zeolite. TPAOH, a conventional microporous template, can be used as the single SDA to prepare hierarchical ZSM-5 zeolite [75,76]. Hua et al [76] successfully prepared the hierarchical ZSM-5 zeolite using only TPAOH as the SDA through one-step hydrothermal process at a relatively low temperature of 100 • C, and they proposed a "nucleation/growth-demetallation/recrystallization" mechanism during the hydrothermal synthesis process.…”

Section: Single Templating Methodsmentioning

confidence: 99%

“…High aluminum content could Figure 11. The mechanism for the formation of HSZs [76]. Copyright Elsevier, 2015.…”

Section: Alkaline Etchingmentioning

confidence: 99%

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

Yang

Yan

2017

Catalysts

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ZSM-5 zeolite is widely used in catalytic cracking of hydrocarbon, but the conventional ZSM-5 zeolite deactivates quickly due to its simple microporous and long diffusion pathway. Many studies have been done to overcome these disadvantages recently. In this review, four main approaches for enhancing the catalytic performance, namely synthesis of ZSM-5 zeolite with special morphology, hierarchical ZSM-5 zeolite, nano-sized ZSM-5 zeolite and optimization of acid properties, are discussed. ZSM-5 with special morphology such as hollow, composite and nanosheet structure can effectively increase the diffusion efficiency and accessibility of acid sites, giving high catalytic activity. The accessibility of acid sites and diffusion efficiency can also be enhanced by introducing additional mesopores or macropores. By decreasing the crystal size to nanoscale, the diffusion length can be shortened. The catalytic activity increases and the amount of carbon deposition decreases with the decrease of crystal size. By regulating the acid properties of ZSM-5 with element or compound modification, the overreaction of reactants and formation of carbon deposition could be suppressed, thus enhancing the catalytic activity and light alkene selectivity. Besides, some future needs and perspectives of ZSM-5 with excellent cracking activity are addressed for researchers' consideration.

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“…Zeolites are undoubtedly important heterogeneous catalysts, and the number of industrial processes, in which they are used in that capacity, has been constantly increasing. The interest is mainly issued by the great opportunities these methodologies open up when developing functional zeolite based materials, such as hybrid organic-inorganic molecular sieves [ 1 , 2 , 3 ], hierarchical microporous-mesoporous zeolites [ 4 , 5 , 6 , 7 ], nanozeolites [ 8 , 9 , 10 ], and template-free molecular sieves [ 4 , 7 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Local Structures of Two-Dimensional Zeolites—Mordenite and ZSM-5—Probed by Multinuclear NMR

et al. 2020

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Mesostructured pillared zeolite materials in the form of lamellar phases with a crystal structure of mordenite (MOR) and ZSM-5 (MFI) were grown using CTAB as an agent that creates mesopores, in a one-pot synthesis; then into the CTAB layers separating the 2D zeolite plates were introduced by diffusion the TEOS molecules which were further hydrolyzed, and finally the material was annealed to remove the organic phase, leaving the 2D zeolite plates separated by pillars of silicon dioxide. To monitor the successive structural changes and the state of the atoms of the zeolite framework and organic compounds at all the steps of the synthesis of pillared MOR and MFI zeolites, the nuclear magnetic resonance method (NMR) with magic angle spinning (MAS) was applied. The 27Al and 29Si MAS NMR spectra confirm the regularity of the zeolite frameworks of the as synthetized materials. Analysis of the 1H and 13C MAS NMR spectra and an experiment with variable contact time evidence a strong interaction between the charged “heads” –[N(CH3)3]+ of CTAB and the zeolite framework at the place of [AlO4]− location. According to 27Al and 29Si MAS NMR the evacuation of organic cations leads to a partial but not critical collapse of the local zeolite structure.

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One-pot synthesis of hierarchically structured ZSM-5 zeolites using single micropore-template

Cited by 22 publications

References 35 publications

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Controllable fabrication of single-crystalline, ultrafine and high-silica hierarchical ZSM-5 aggregates via solid-like state conversion

Strategies to Enhance the Catalytic Performance of ZSM-5 Zeolite in Hydrocarbon Cracking: A Review

Local Structures of Two-Dimensional Zeolites—Mordenite and ZSM-5—Probed by Multinuclear NMR

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