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

Martínez-Franco, Raquel; Paris, Cecilia; Martínez‐Triguero, Joaquín; Moliner, Manuel; Corma, Avelino

doi:10.1016/j.micromeso.2017.03.014

Cited by 13 publications

(14 citation statements)

References 44 publications

(34 reference statements)

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“…Similar to most 2D layered materials that have siliceous compositions, PLS-1 and its 3D zeolite CDS-1 cannot behave as solid acid catalysts because the framework is constructed solely of tetrahedral SiO 4 units. Recently, B- [123], Ge- [124], and Al- [95,116] containing PLS-1 and their layered iso-structures were prepared. CDS-1 zeolites with these heteroatoms were also made by direct calcination of these 2D layers.…”

Section: D Layers With 8-mr Zeolite (Cas Cdo Mtf Nsi Rth Rwr) Tmentioning

confidence: 99%

“…Derivatives of 2D layers with the CDO zeolite topology are currently being explored. As shown in Table 3, interlayer-expansion by the silyation [115,116,118,119,125] and pillaring [33] of PLS-1 has led to COD zeolites with expanded and pillared structures.…”

Section: D Layers With 8-mr Zeolite (Cas Cdo Mtf Nsi Rth Rwr) Tmentioning

confidence: 99%

“…Materials 2020, 13, 1822 11 of 52 [115,116,118,119,125] and pillaring [33] of PLS-1 has led to COD zeolites with expanded and pillared structures. HPM (nanostructured hybrid biohybrid and porous materials)-2 is a new layered organosilicate containing 2D layers with an MTF topology, yielding zeolite MTF by calcination [100].…”

Section: D Layers With 8-mr Zeolite (Cas Cdo Mtf Nsi Rth Rwr) Tmentioning

confidence: 99%

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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 8-mr Zeolite (Cas Cdo Mtf Nsi Rth Rwr) Tmentioning

confidence: 99%

Section: D Layers With 8-mr Zeolite (Cas Cdo Mtf Nsi Rth Rwr) Tmentioning

confidence: 99%

Section: D Layers With 8-mr Zeolite (Cas Cdo Mtf Nsi Rth Rwr) Tmentioning

confidence: 99%

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Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Schulman

Liu

2020

Materials

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“…[112] Analogous to PREFER, pillaring and interlayer expansion was also successful in the case of lamellar CDO structures. [113] Zeolite NSI, another zeolite framework with al ayered substructure,w as first obtained in 1983 from an indirect layered precursor named Nu-6(1) by using 4,4'-dipyridine as the OSDA. [114] Nevertheless,i ts crystalline structure, which consists of 5-rings connected by shared edges,similarly to FER and CDO but different in spatial symmetry,was not recognized until 20 years later.…”

Section: Angewandte Chemiementioning

confidence: 99%

Building Zeolites from Precrystallized Units: Nanoscale Architecture

2018

Self Cite

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Since the early reports by Barrer in the 1940s on converting natural minerals into synthetic zeolites, the use of precrystallized zeolites as crucial inorganic directing agents to synthesize other crystalline zeolites with improved physicochemical properties has become a very important research field, allowing the design, particularly in recent years, of new industrial catalysts. This Review highlights how the presence of some crystalline fragments in the synthesis media, such as small secondary building units (SBUs) or layered substructures, not only favors the crystallization of other zeolites with similar SBUs or layers, but also permits control over important parameters affecting their catalytic activity (chemical composition, crystal size, or porosity, etc.). Recent advances in the preparation of 3D and 2D zeolites through seeding and zeolite-to-zeolite transformation processes will be discussed extensively in this Review, including their preparation in the presence or absence of organic structure-directing agents (OSDAs). The aim is to introduce general guidelines for more efficient approaches for target zeolites.

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“…Many of these have indeed succeeded in directing the formation of zeolite frameworks, some of them even being chiral. Figures 1 and 3 report a list of the organic molecules that have successfully led to zeolite frameworks in silica-based ( Figure 1) [17,[40][41][42][43][44][45][46][47][48][49][50][51][52][53] and metalophosphate compositions ( Figure 3), respectively; Figure 2 shows additional chiral SDAs that were unsuccessful to direct the crystallization of zeolite frameworks.…”

Section: Chiral Organic Structure-directing Agents: General Aspectsmentioning

confidence: 99%

Chiral Organic Structure-Directing Agents

Gómez‐Hortigüela

Bernardo-Maestro

2017

Structure and Bonding

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Chirality is crucial for life. The preparation of enantiopure chiral compounds is highly desirable in the chemical industry, especially in the pharmaceutical sector. In this context, the design of chiral solids able to discriminate between enantiomers of chiral compounds, either during adsorption or asymmetric catalytic processes, is one of the greatest challenges nowadays in chemical research. Zeolite-type materials represent ideal candidates to achieve enantioselective chiral solids since they could combine their high stability, surface area and shape-selectivity with a potential enantioselectivity that could be enhanced by the confinement effect. Despite the occurrence of chiral zeolite frameworks and the strong interest in preparing these chiral solids, very little success has been met in preparing these in homochiral form. The main strategy to induce chirality in zeolite materials has been the use of chiral structure-directing agents, in an attempt to transfer their chiral feature into the nascent zeolite structure. However, although many chiral organic species have directed the crystallization of zeolite frameworks, some of them even being chiral, there is only one unique very recent example of success in transferring the chirality from the organic structure-directing agent into an enantio-enriched chiral zeolite material. Chiral coordination compounds have been very successful in transferring their chirality onto inorganic frameworks through the development of extensive H-bond host-guest interactions, but these chiral materials usually collapse upon removal of the guest species. In this chapter we report the different types of chiral molecules, both organic and organometallic compounds, used so far as structure-directing agents in an attempt to promote the crystallization of homochiral zeolites; we analyze in detail the possible reasons for the general failure in transferring their chirality, and we propose approaches to prepare known chiral zeolite frameworks in homochiral form. Furthermore, we also review a different approach we have followed in our group in order to induce chirality in zeolite materials, consisting in the development of chiral spatial distributions of dopants embedded in otherwise achiral zeolite frameworks.

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

Cited by 13 publications

References 44 publications

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Building Zeolites from Precrystallized Units: Nanoscale Architecture

Chiral Organic Structure-Directing Agents

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