Synthesis of Single-Crystalline Mesoporous ZSM-5 with Three-Dimensional Pores via the Self-Assembly of a Designed Triply Branched Cationic Surfactant

Singh, B. B.; Xu, Dongdong; Han, Lu; Ding, Jian; Wang, Yimeng; Che, Shunai

doi:10.1021/cm503919h

Cited by 66 publications

(79 citation statements)

References 34 publications

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“…Tsapatsis and co-workers have also reported one-step synthesis of self-pillared pentasil (SPP) zeolite composed of orthogonally connected single-unit cell lamellae [20]. Many other hierarchical zeolite materials possessing similar nanosheets structure reported recently [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of mesostructured ZSM-5 zeolite with enhanced mass transport and catalytic performances

Ren

Gou

et al. 2017

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of mesostructured ZSM-5 zeolite with enhanced mass transport and catalytic performances

Ren

Gou

et al. 2017

Applied Surface Science

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“…Therefore, the synthesis of MFI nanosheets with the aid of Gemini-type diaquaternary ammonium surfactant is defi nitely innovative and promising, since the MFI structure is the second most important zeolite catalyst in industrial catalytic applications, and no corresponding 2D layered precursor was reported before. [ 99 ] Recently, the methodology has been proved to be effective to prepare zeolite nanosheets with other topologies by adopting carefully-designed bifunctional surfactants as OSDA. Inspired by this pioneering work, Che and co-workers designed a series of surfactant molecules possessing a single quaternary ammonium head group and aromatic groups in the hydrophobic tail, which resulted in single-crystalline mesostructured zeolite nanosheets (SCZN-1) with a lamellar structure.…”

Section: Layered Zeolite Nanosheets Directed By Bifunctional Surfactantsmentioning

confidence: 99%

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

Sun

2016

Advanced Energy Materials

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traditional hydrothermal syntheses would produce intermediate materials with 2D feature, such as MCM-22P, [ 7,8 ] PREFER, [ 9 ] which are composed of crystalline zeolite layers with the unit-cell thickness stacking on top of each other in ordered or disordered patterns. [10][11][12][13][14][15] Unlike traditional 3D zeolites, the crystal growth of frameworks in 2D layered zeolites is restricted in one particular direction, leaving lots of hydroxyl groups on layer surface. As zeolites are normally defi ned as 3D materials that possess regular micropore systems and consist of TO 4 tetrahedra, layered zeolite precursors containing silanols could not be regarded as zeolites in the strictest sense, but they are broadly included in the family of zeolite materials. Thus, the as-synthesized 2D zeolites are often denoted as layered zeolite precursors (the typical examples are shown in Table 1 ), [7][8][9] which would transform into their 3D order/disorder counterparts after removing organic molecules and condesation of interlayer silanols via calcination. [ 10 ] In the early research stage, the layered zeolite precursors are discovered accidentally in traditional hydrothermal syntheses, because we have limited control over the traditional synthesis process due to the incomplete understanding of crystallization mechanism. At that stage, one of the most attractive features of 2D zeolites is that they could transform into zeolite materials with hierarchical architectures. In some cases, the traditional synthesis produces hierarchical layered material, such as MCM-56, [ 26 ] in which the crystalline zeolite layers disorderly stacked. Furthermore, the recognition that the obtained layered precursors could be modifi ed into various hierarchical zeolite structures (such as delaminated, pillared, interlayer expanded and others) make them signifi cantly different from conventional 3D zeolite materials with rigid structures. Thus, the construction of hierarchical zeolite materials from the perspective of 2D layered zeolite precursors is an important research aspect during the past few years.With the improved synthetic techniques, layered zeolites are not only increasing in number, but also expanding the notion in composition and structure. One remarkable breakthrough in recent years is the discovery of 2D MFI nanosheets with the single unit-cell thickness (about 2 nm), which is achieved by adopting Gemini-type bifunctional surfactants as organic structure-directing agent (OSDA) in hydrothermal synthesis. [ 49 ] The calcined MFI nanosheets become a special kind of hierarchical zeolites Two-dimensional (2D) zeolites, originating from lamellar precursors, are a special kind of porous materials, in which crystalline zeolite nanolayers are weakly assembled in one particular direction. As there is no covalentbond between layers, the stacking sequences could be manipulated and possibly controlled to derive a family of zeolitic materials with structural diversity. The research on 2D zeolites arises from the primary casual discovery during ...

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“…Then, azobenzene was introduced to the hydrophobic tail, giving rise to helical cylindrical assemblies, in contrast to nanosheet assemblies, directing a lamellar‐structured zeolite, which leads to the formation of hierarchical MFI zeolite with a two‐dimensional (2D) square mesostructure . Finally, benzene‐ring‐ and triphenylbenzene‐centered three‐armed amphiphilic molecules, each with bis(quaternary ammonium)‐containing head groups, were synthesized, and they directed the formation of single‐crystalline mesoporous ZSM‐5 with three‐dimensional (3D) pores and sheetlike mesopores layered along the a ‐axis, respectively. We believe that this design concept will shed light on the synthesis of other types of mesoporous zeolites.…”

Section: Introductionmentioning

confidence: 99%

π–π Interactions Between Aromatic Groups in Amphiphilic Molecules: Directing Hierarchical Growth of Porous Zeolites

Zhang

Che

2019

Angewandte Chemie

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The development of hierarchical macro‐ or mesoporous zeolites is essential in zeolite synthesis because the size of the micropores limits mass transport and their use as industrial catalysts for bulky molecules. Although major breakthroughs have been achieved, fabricating crystallographically ordered mesoporous zeolites using a templating strategy is still an unsolved challenge. This minireview highlights our recent efforts on the self‐assembly of amphiphilic molecules to obtain ordered hierarchical MFI zeolites by introducing aromatic groups into the hydrophobic tail of the amphiphilic molecules. Owing to the geometric matching between the self‐assembled aromatic tails and the MFI framework, a) single‐crystalline mesostructured zeolite nanosheets (SCZNs), b) SCZNs with a 90° rotational intergrowth structure, c) a hierarchical MFI zeolite with a two‐dimensional square P4mm mesostructure, and d) a single‐crystalline mesoporous ZSM‐5 with three‐dimensional pores and sheetlike mesopores layered along the a‐axis were successfully synthesized.

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Synthesis of Single-Crystalline Mesoporous ZSM-5 with Three-Dimensional Pores via the Self-Assembly of a Designed Triply Branched Cationic Surfactant

Cited by 66 publications

References 34 publications

Facile synthesis of mesostructured ZSM-5 zeolite with enhanced mass transport and catalytic performances

Facile synthesis of mesostructured ZSM-5 zeolite with enhanced mass transport and catalytic performances

Recent Advances in the Synthesis and Application of Two‐Dimensional Zeolites

π–π Interactions Between Aromatic Groups in Amphiphilic Molecules: Directing Hierarchical Growth of Porous Zeolites

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