Synthesis of micro-mesoporous aluminosilicates on the basis of ZSM-5 zeolite using dual-functional templates at presence of micellar and molecular templates

Barakov, Roman; Shcherban, Nataliya D.; Yaremov, P. S.; Bezverkhyy, Igor; Baranchikov, А. Е.; Trachevskii, V. V.; Tsyrina, V. V.; Ilyin, Vladimir G.

doi:10.1016/j.micromeso.2016.09.009

Cited by 28 publications

(19 citation statements)

References 63 publications

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“…The effect on catalysis is not reported. [213] Polymers can also help in the formation of nanozeolite aggregates. An aggregate of 30 nm sized ZSM-5 crystals was synthesized using anionic polyacrylamide as template.…”

Section: Zsm-5mentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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Section: Zsm-5mentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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“…However, the C/N + ratio of the terminated ammonium groups should not be too high for zeolite synthesis [16]. Other mixed templates such as [3-(trimethoxysilyl) propyl] hexadecyl dimethylammonium chloride [3-(trimethoxysilyl) propyl] hexadecyl dimethyl ammonium chloride [3-(trimethoxysilyl) propyl] hexadecyl dimethyl ammonium chloride (TPHAC)/tetrapropylammonium bromide (TPABr), diquaternary ammonium/TPABr and diquaternary ammonium/cetyltrimethylammonium bromide (CTAB)/TPAOH were applied to hierarchical zeolite nanosheet synthesis [17][18][19]. For example, the proposed mechanism for the formation of ZSM-5 nanosheets in the presence of C 18-6-6 and TPABr is shown in Figure 1.…”

Section: Synthesis Of Hierarchical Zeolite Nanosheetsmentioning

confidence: 99%

A Comprehensive Review of the Applications of Hierarchical Zeolite Nanosheets and Nanoparticle Assemblies in Light Olefin Production

Dugkhuntod

Wattanakit

2020

Catalysts

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Light olefins including ethylene, propylene and butylene are important building blocks in petrochemical industries to produce various chemicals such as polyethylene, polypropylene, ethylene oxide and cumene. Traditionally, light olefins are produced via a steam cracking process operated at an extremely high temperature. The catalytic conversion, in which zeolites have been widely used, is an alternative pathway using a lower temperature. However, conventional zeolites, composed of a pure microporous structure, restrict the diffusion of large molecules into the framework, resulting in coke formation and further side reactions. To overcome these problems, hierarchical zeolites composed of additional mesoporous and/or macroporous structures have been widely researched over the past decade. In this review, the recent development of hierarchical zeolite nanosheets and nanoparticle assemblies together with opening up their applications in various light olefin productions such as catalytic cracking, ethanol dehydration to ethylene, methanol to olefins (MTO) and other reactions will be presented.Catalysts 2020, 10, 245 2 of 15 windows, they can be divided into three different categories including large porous, medium porous and small porous zeolites, which are composed of a different number of tetrahedral units, or T atoms of 12, 10 and 8 membered rings, respectively. These behaviors make each zeolite serving unique shape selective properties, which are very important for the appropriate applications.Although there are several above-mentioned promising properties of zeolites, they are typically composed of a very small microporous structure, eventually resulting in some disadvantages of the diffusion limitation of guest molecules inside the framework. Some bulky molecules cannot easily penetrate into active sites located at microporous channels, and therefore a poor catalytic performance due to a very low reaction rate and a fast deactivation of catalysts is observed. To overcome these limitations and to improve the accessibility of molecules into active sites, in recent years modified zeolites obtained by introducing additional larger porous structures have been extensively developed [5][6][7][8].It is well known that hierarchical zeolites, composed of at least two levels of porous structures such as microspores and mesopores, microspores and macropores, and micropores/mesopores and macropores have been extensively studied and developed. Their microporous (<2 nm), mesoporous (2-50 nm) and/or macroporous (>50 nm) structures are well connected to each other. In this case, the additional larger porous structures can improve diffusion limitation, molecular transportation and coke deposition [9]. In the past decade, there have been several studies regarding the synthesis of hierarchical zeolites to overcome these problems. Herein, this comprehensive review opens up perspectives of the recent synthesis approaches of hierarchical zeolite nanosheets and nanoparticle assemblies, as well as the successful production of light olef...

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“…Hierarchical structured zeolites have advantages of both crystalline micropores and mesopores, especially intracrystalline mesopores. The diffusion problem can be well alleviated with the introduction of mesopores . From this view, they are desirable materials for adsorption and separation, catalysis of bulky molecules, ion exchange and so on.…”

Section: Introductionmentioning

confidence: 99%

“…There are many synthesis strategies that can be used for the preparation of hierarchical zeolites. One effective route is to use post‐synthetic treatments, which can be classified into dealumination or desilication by chemical or hydrothermal methods . However, as‐obtained mesopores are uncontrollable, and the destructive power to the inherent structure of the molecular sieve is extremely great so that it is impossible to achieve stable experimental results in subsequent applications.…”

Section: Introductionmentioning

confidence: 99%

The success of dual‐functional templating for synthesizing hierarchical analcime zeolite

Wang

Tian

He³

et al. 2019

Applied Organom Chemis

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Novel and innovative hierarchical analcime zeolites were prepared by adding a gemini surfactant which acted as a dual‐functional template. Through a one‐step hydrothermal process, a hierarchical analcime zeolite with abundant intracrystalline mesopores was synthesized. Powder X‐ray diffraction and N2 adsorption–desorption data show that the mesoporous composites possess both a quite a number of mesopores and analcime structure. The results suggest that the dual‐functional template can be effective in the synthesis of hierarchical analcime zeolites.

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Synthesis of micro-mesoporous aluminosilicates on the basis of ZSM-5 zeolite using dual-functional templates at presence of micellar and molecular templates

Cited by 28 publications

References 63 publications

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

A Comprehensive Review of the Applications of Hierarchical Zeolite Nanosheets and Nanoparticle Assemblies in Light Olefin Production

The success of dual‐functional templating for synthesizing hierarchical analcime zeolite

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