Topotactic Conversion of β‐Helix‐Layered Silicate into AST‐Type Zeolite through Successive Interlayer Modifications

Takayama, Ryosuke; Shibue, Toshimichi; Kuroda, Kazuyuki

doi:10.1002/chem.201303368

Cited by 27 publications

(16 citation statements)

References 50 publications

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“…3 This methodology allows transforming lamellar zeolites containing silicate sheets into three-dimensional crystalline structures with specific pore architectures or chemical compositions by simple post-synthetic methods. 3 Up to now, the following zeolite structures have been achieved from a layered precursor: AST, 4 CAS, 5 CDO, 6 FER, 7 MTF, 8 MWW, 9 PCR, 10 , RRO, 11 RTH, 12 RWR, 13 or SOD. 14 From all these structures, CDO-related materials have been extensively studied, because depending on the post-synthetic treatments, it is possible to design zeolitic structures with different pore topologies.…”

Section: -Introductionmentioning

confidence: 99%

Direct synthesis of the aluminosilicate form of the small pore CDO zeolite with novel OSDAs and the expanded polymorphs

Martínez-Franco

Paris

Martínez‐Triguero

et al. 2017

Microporous and Mesoporous Materials

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Section: -Introductionmentioning

confidence: 99%

Direct synthesis of the aluminosilicate form of the small pore CDO zeolite with novel OSDAs and the expanded polymorphs

Martínez-Franco

Paris

Martínez‐Triguero

et al. 2017

Microporous and Mesoporous Materials

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“…In a similar scenario, the 2D AST (aluminophosphate with sequence number sixteen) zeolite precursor, a β-helix-layered silicate (β-HLS), was first synthesized by Akiyama et al in 1999 [52], and its structure was identified by Ikeda et al in 2001 [53]. The successful topotactic conversion of β-HLS into the AST-type zeolite was reported by Asakura et al in 2014 [54]. An excellent review on topotactic condensation of 2D layered silicate precursors into zeolite was published in 2012 [55].…”

Section: History Of 2d Zeolite Precursors and Their Derivativesmentioning

confidence: 90%

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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“…The silicate layers can formally be condensed by a reaction ≡Si-OH + HO-Si≡ → ≡Si-O-Si≡ + H 2 O to generate a framework structure. This has been demonstrated in the successful condensation of, e.g., RUB-15 to silica sodalite (Moteki et al 2011), β-helix layered silicate to AST type zeolite, (Asakura et al 2014), PREFER to silica ferrierite (Schreyeck et al 1996), layer silicate RUB-18 to a zeolite of the RWR type (Marler et al 2005;Oumi et al 2007;Ikeda et al 2008) and RUB-39 to RUB-41 (= RRO type zeolite) (Y. Wang et al, 2005).…”

Section: Hypothetical Framework Structure Of Condensed Magadiitementioning

confidence: 99%

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

Marler

Krysiak

Grosskreuz

et al. 2022

American Mineralogist

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Magadiite from Lake Magadi was structurally analyzed based on X-ray powder diffraction data. The idealized chemical composition of magadiite is Na16[Si112O224(OH)16]∙64H2O per unit cell. The XRD powder diffraction pattern was indexed in orthorhombic symmetry with lattice parameters a0 = 10.5035(9) Å, b0 = 10.0262(9) Å, and c0 = 61.9608(46) Å. The crystal structure was solved from a synthetic magadiite sample in a complex process using 3D electron diffraction combined with model building as presented in an additional paper. A Rietveld refinement of this structure model performed on a magadiite mineral sample in space group F2dd (No. 43) converged to residual values of RBragg = 0.031 and RF = 0.026 confirming the structure model. Physico-chemical characterization using solid-state NMR spectroscopy, SEM, TG-DTA, and DRIFT spectroscopy further confirmed the structure. The structure of magadiite contains two enantiomorphic silicate layers of, so far, unknown topology. The dense layers exhibit no porosity or micro-channels and have a thickness of 11.5 Å (disregarding the van der Waals radii of the terminal O atoms) and possess a silicon Q4 to Q3 ratio of 2.5. 16 out of 32 terminal silanol groups are protonated, and the remaining groups compensate for the charge of the hydrated sodium cations. Bands of edge-sharing [Na(H2O)6/1.5] octahedra are intercalated between the silicate layers extending along (110) and (110). The water molecules are hydrogen bonded to terminal silanol groups with O···O distances of 2.54–2.91 Å. The structure of magadiite is slightly disordered, typical for hydrous layer silicates (HLS), which possess only weak interactions between neighboring layers. In this respect, the result of the structure refinement represents a somewhat idealized structure. Nevertheless, the natural magadiite possesses a higher degree of structural order than any synthetic magadiite sample. The structure analysis also revealed the presence of strong intra-layer hydrogen bonds between the terminal O atoms (silanol/siloxy groups), confirmed by 1H MAS NMR and DRIFT spectroscopy. The surface zone of the silicate layers, as well as the interlayer region containing the [Na(H2O)6/1.5] octahedra, are closely related to the structure of Na-RUB-18.

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Topotactic Conversion of β‐Helix‐Layered Silicate into AST‐Type Zeolite through Successive Interlayer Modifications

Cited by 27 publications

References 50 publications

Direct synthesis of the aluminosilicate form of the small pore CDO zeolite with novel OSDAs and the expanded polymorphs

Direct synthesis of the aluminosilicate form of the small pore CDO zeolite with novel OSDAs and the expanded polymorphs

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

The crystal structure of mineral magadiite, Na2Si14O28(OH)2∙8H2O

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