Silica Sodalite without Occluded Organic Matters by Topotactic Conversion of Lamellar Precursor

Moteki, Takahiko; Chaikittisilp, Watcharop; Shimojima, Atsushi; Okubo, Tatsuya

doi:10.1021/ja806930h

Cited by 94 publications

(73 citation statements)

References 19 publications

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“…The indirect layered precursor routes were subsequently identified for some traditional zeolites, well-known for years via minerals and synthetic solids, i.e., ferrierite [16] and sodalite [17]. A hypothesis was formulated [15] that many, if not most, zeolite structures may be accessible by both direct and indirect pathways, currently represented only by the 2-D layered precursors but in general one cannot rule out others, such as 1-D species (A reviewer kindly pointed out that Akporiaye and Price [4] and Shannon [5] had already demonstrated that most zeolites could be built by the stacking of layers.…”

Section: Discussionmentioning

confidence: 99%

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The role of symmetry in building up zeolite frameworks from layered zeolite precursors having ferrierite and CAS layers

Roth

Dorset

2009

Struct Chem

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Layered zeolite precursors represent an emerging class of materials that expand the zeolite field in a new direction and have already produced new intriguing discoveries. One is a new fundamental insight that a zeolite framework can assemble by two pathways, directly in 3-D and via a layered precursor. Also new types of materials such as pillared and delaminated zeolites have been synthesized. Starting with the discovery of MCM-22 precursor in 1990s, other framework structures have now been obtained by topotactic condensation, including classical zeolites such as sodalite and ferrierite. The recent structural diversity observed with FER and CAS layers, which were found to produce two frameworks each, i.e. FER/CDO and CAS/NSI, respectively, are herein rationalized as resulting from the absence of in-plane mirror symmetry. A systematic treatment is envisioned, such as consideration of translational and pseudo-translational interactions in condensation of elementary shapes into close-packed assemblies, providing a blueprint for a general approach to analyze new precursors in the future. Other already documented instances of structural diversity include the presence of both types of packing in one preparation (CAS and NSI) and incomplete pairing of silanols connecting FER layers in ESR-12.

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Section: Discussionmentioning

confidence: 99%

“…Ferrierite and some newer precursors showed additional complexity [16,17,[25][26][27][28][29] associated with silanol distribution on the surface of the layers, which in turn relates to internal symmetry of these layers.…”

Section: Layered Precursors With Fer Sheetsmentioning

confidence: 99%

The role of symmetry in building up zeolite frameworks from layered zeolite precursors having ferrierite and CAS layers

Roth

Dorset

2009

Struct Chem

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“…Syntheses were performed under hydrothermal conditions at 150°C for 3 weeks in Teflon lined autoclaves. The typical gel composition is: SiO 2 :0.5SDA:xH 2 O where x = 8-12 [1]. The concentration of the trivalent T-atom was in the range of 1-5% in terms of molar ratio of SiO 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The thermal post-synthesis treatment of hydrous layer silicates has proven to be a successful method to obtain 3-dimensional zeolitic materials not only with unique and unexpected morphologies [2], but also with new framework topologies. However, because of the all-silica compositions of the layered precursors, the new zeolite frameworks as condensation products were primarily obtained in their all silica form [1,[3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Layered precursors for new zeolitic materials: Synthesis and characterization of B-RUB-39 and its condensation product B-RUB-41

Grünewald-Lüke

Gies

Müller

et al. 2012

Microporous and Mesoporous Materials

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“…Another related material, called EU-20b, formed from calcining its precursor, EU-19 prepared with a piperazinium SDA, was found to form an intergrowth material composed of NSI and CAS framework layers [151]. Acetic acid treatment was found to decrease the distance between the layers of RUB-15 from 14 to 7.7Å, allowing the conversion of the material to the pure-silica SOD framework upon calcination [152]. The key to the success of the acetic acid treatment was that it allowed the layers to shift one half unit cell along the c-axis to align the layers, which does not occur by treatment with hydrochloric acid.…”

Section: Layered Precursorsmentioning

confidence: 99%

Synthesis Approaches

Strohmaier

2010

Zeolites and Catalysis

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Zeolites were first identified as natural minerals having unique physical absorption properties. Early researchers tried to reproduce the geological conditions in an attempt to make them synthetically. From the years 1845 to 1937 many researchers investigated the hydrothermal conversion and synthesis of silicates. Although there were a number of claims that zeolites had been made synthetically, they were unsubstantiated as identification was based upon chemical analysis and optical observations. Later attempts at reproducing these early experiments did not give identifiable zeolites. It was not until the 1940s that Professor Richard M. Barrer found the necessary conditions for making zeolites synthetically and he identified them by powder X-ray diffraction. By reacting the powder minerals leucite and analcime with aqueous solutions of barium chloride at temperatures of 180-270 • C for two to six days, a synthetic chabazite was obtained. In 1948, Professor Barrer was able to synthesize zeolites entirely from synthetic solutions of sodium aluminate, silicic acid, and sodium carbonate [1]. A dry powdered gel was first obtained by drying the mixture at 110 • C, and then crystallizing it to a synthetic mordenite by reacting the gel with water at higher temperatures. In the 1950s, Donald Breck and researchers at the Union Carbide Company began to synthesize zeolites from reactive aluminosilicate gels prepared from sodium aluminate and sodium silicate solutions. This led directly to the discovery of the first two new synthetic zeolites, Linde A [2] and Linde X (Si/Al = 1.0-1.5) [3], both having new framework structures, LTA and FAU, respectively. Linde A was found to have excellent ion exchange and gas separation properties. Later, a new, higher silica containing composition of FAU, designated Linde Y [4] (Si/Al = 1.5-3.0), was synthesized and was found to be an excellent cracking catalyst for the conversion of distilled crude oil to gasoline products. The discovery of these two industrially important zeolites caught the attention of many scientists and kick started the field of zeolite synthesis research.

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Silica Sodalite without Occluded Organic Matters by Topotactic Conversion of Lamellar Precursor

Cited by 94 publications

References 19 publications

The role of symmetry in building up zeolite frameworks from layered zeolite precursors having ferrierite and CAS layers

The role of symmetry in building up zeolite frameworks from layered zeolite precursors having ferrierite and CAS layers

Layered precursors for new zeolitic materials: Synthesis and characterization of B-RUB-39 and its condensation product B-RUB-41

Synthesis Approaches

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