Post-synthesis and Catalytic Performance of Novel Interlayer Expanded Stanosilicate IEZ-Sn-PLS-3

Yang, Boting; Zou, Qingyu

doi:10.1246/cl.170850

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…Heteroatoms such as Al, Ge, Ti, and B can be incorporated into the structures as well ( Table 5). The pillaring process introduced additional elements such as Fe [34], Cr [34], and Sn [165], which further diversifies the acidity of FER-based 2D zeolite materials.…”

Section: D Layers With Fer Framework Topologymentioning

confidence: 99%

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Schulman

Liu

2020

Materials

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Zeolites are generally defined as three-dimensional (3D) crystalline microporous aluminosilicates in which silicon (Si4+) and aluminum (Al3+) are coordinated tetrahedrally with oxygen to form large negative lattices and consequent Brønsted acidity. Two-dimensional (2D) zeolite nanosheets with single-unit-cell or near single-unit-cell thickness (~2–3 nm) represent an emerging type of zeolite material. The extremely thin slices of crystals in 2D zeolites produce high external surface areas (up to 50% of total surface area compared to ~2% in micron-sized 3D zeolite) and expose most of their active sites on external surfaces, enabling beneficial effects for the adsorption and reaction performance for processing bulky molecules. This review summarizes the structural properties of 2D layered precursors and 2D zeolite derivatives, as well as the acidity properties of 2D zeolite derivative structures, especially in connection to their 3D conventional zeolite analogues’ structural and compositional properties. The timeline of the synthesis and recognition of 2D zeolites, as well as the structure and composition properties of each 2D zeolite, are discussed initially. The qualitative and quantitative measurements on the acid site type, strength, and accessibility of 2D zeolites are then presented. Future research and development directions to advance understanding of 2D zeolite materials are also discussed.

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Section: D Layers With Fer Framework Topologymentioning

confidence: 99%

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Schulman

Liu

2020

Materials

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“…As a result, Sn-Beta is so far the most studied tin-silicate catalyst 442,443 in BV oxidation but other -in particular 2D dimensional -catalysts have been reported recently; namely: (I) the Sn-MFI familly including conventional 3D Sn-MFI, 2D Sn-MFI nanosheets, 296 Sn-selfpillared pentasil catalyst 293 and tin-silica pillared MFI; 246 (II) the MWW family including 3D Sn-MWW, partially delaminated Sn-MCM-56 295 and Sn-DZ-1 444 and pillared Sn-MWW(SP)-SSE 396 (MCM-36 analogue); (III) tin-silica pillared ICP-1 246 (a UTL-based material) and (IV) IEZ-Sn-PLS-3 which is an interlayer expanded zeolite with FER layers. 445 For complete image we should mention that also several Sn mesoporous molecular sieves (e.g. Sn-MCM-41) were reported.…”

Section: Selective Oxidation/reduction Reactionsmentioning

confidence: 99%

From 3D to 2D zeolite catalytic materials

et al. 2018

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Research activities and recent developments in the area of three-dimensional zeolites and their two-dimensional analogues are reviewed. Zeolites are the most important industrial heterogeneous catalysts with numerous applications. However, they suffer from limited pore sizes not allowing penetration of sterically demanding molecules to their channel systems and to active sites. We briefly highlight here the synthesis, properties and catalytic potential of three-dimensional zeolites followed by a discussion of hierarchical zeolites combining micro- and mesoporosity. The final part is devoted to two-dimensional analogues developed recently. Novel bottom-up and top-down synthetic approaches for two-dimensional zeolites, their properties, and catalytic performances are thoroughly discussed in this review.

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“…Pyridine desorption at different temperatures was carried out using IEZ-Sn-PLS-3-50(S4R) (Figure 6). The absorbance at 1450 cm −1 which was attributed to Lewis acid sites, and at 1490 cm −1 , which was attributed to both Brønsted and Lewis acid sites, remained even after desorption at a high temperature of 723 K. 32 Since these two absorbances were related to the vibration modes of the pyridine molecules adsorbed on the Lewis acid sites, they can serve as proof for the existence of Lewis acid sites in this stanosilicate material.…”

Section: Resultsmentioning

confidence: 91%

Preparation of extra-large micropore Sn-zeolites and their catalytic performance in Baeyer–Villiger oxidations

Yang

Cui

2020

Journal of Chemical Research

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A series of extra-large micropore Sn-zeolites with different Si/Sn ratios is post-synthesized by treating the interlayer-expanded material ECNU-9-cal773 with a solution of HCl containing NH4F and SnCl4∙5H2O, named as IEZ-Sn-PLS-3(S4R). During treatment, HCl, NH4F, and SnCl4∙5H2O are hydrolyzed into H+, F+, and Sn4+ ions. The formation of a small amount of HF formed from H+ and F+ ions can corrode the Si atom of the zeolite sheets and generate hydroxy-nest defect sites, Sn4+ ions fill up the hydroxy-nests to form isolated framework Sn active sites. The structure and active sites of the obtained materials are studied by various characterization methods. IEZ-Sn-PLS-3(S4R) possesses a 14 × 12-ring (R) pore system and framework Sn active sites. With enlarged pore sizes, IEZ-Sn-PLS-3(S4R) has been proved to be efficient for catalyzing the Baeyer–Villiger oxidation of 2-admantanone using H2O2 as the oxidant. The low Si/Sn sample resulted in a higher conversion compared to typical 12-ring zeolite Sn-Beta hydrothermally synthesized in an F− system.

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Post-synthesis and Catalytic Performance of Novel Interlayer Expanded Stanosilicate IEZ-Sn-PLS-3

Cited by 6 publications

References 34 publications

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

From 3D to 2D zeolite catalytic materials

Preparation of extra-large micropore Sn-zeolites and their catalytic performance in Baeyer–Villiger oxidations

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