Synthesis of the RTH-type layer: the first small-pore, two dimensional layered zeolite precursor

Schmidt, Joel E.; Xie, Dan; Davis, Mark E.

doi:10.1039/c5sc02325d

Cited by 34 publications

(29 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CIT (California Institute of Technology)-10, a layered precursor to the siliceous RTH zeolite framework, is an exception, as it contains 8-MR channels going through the layer (Table 2 and Figure 6). In addition, CIT-10 can be directly calcined to form pure-silica RTH (SSZ (Standard Oil Synthetic Zeolite)-50 [126]) or can be expanded by a silyating agent (e.g., dichlorodimethylsilane or diethoxydimethylsilane) to form CIT-11, which is stable following calcination (calcined material denoted as CIT-12) [101]. 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%

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Schulman

Liu

2020

Materials

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 99%

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Schulman

Liu

2020

Materials

View full text Add to dashboard Cite

show abstract

“…The same aluminosilicate zeolite was obtained with a range of different imidazolium cations [159,160]. A layered precursor of RTH, termed CIT-10, was also synthesized using an imidazolium-based dication with a pentamethylene linker, 5b2345TeMI [161].…”

Section: New Compositions Attained With Imidazolium Cationsmentioning

confidence: 99%

Introduction to the Zeolite Structure-Directing Phenomenon by Organic Species: General Aspects

Gómez‐Hortigüela

Camblor

2017

Structure and Bonding

View full text Add to dashboard Cite

During the last years, a tremendous progress has been achieved in the application of new zeolite materials in many different sectors through different pioneering innovations in the field of zeolite synthesis. At the very core of the production of these new zeolite materials lies the use of organic species as structuredirecting agents (SDA), which has been recognized as the most important factor to determine the zeolite product rendered after the crystallization process. These organic species organize the inorganic zeolitic units and drives the crystallization pathway towards the production of particular zeolite framework types. This structure-direction phenomenon frequently works in combination with several other factors related to the chemical composition of the synthesis gels, mainly use of fluoride, concentration (H 2 O/T ratio) and presence of different heteroatoms, which are also relevant for the crystallization of particular zeolite materials. Several properties determine the structure-directing effect of these organic species, especially their molecular size and shape, hydrophobicity, rigidity vs flexibility, and hydrothermal stability. The properties of the zeolitic materials synthesized can be tuned up to a certain point through the use of rationally-selected organic species with particular physico-chemical features as SDA. In this introductory chapter, we briefly review the history of the use of organic cations as SDAs, and give the fundaments of the different aspects related to this structure-direction phenomenon and factors affecting it, explaining the main properties of SDAs, providing some examples of recent uses and trends of organic SDAs, as well as the host-guest chemistry involved. In addition, we pay particular attention to the use of imidazoliumbased organic cations as SDAs because of their current relevance in the synthesis of new zeolite materials.

show abstract

“…We have recently been examining the use of diquaternary OSDAs, and have reported products such as *BEA, CIT‐7, CIT‐8P, CIT‐10, STF, and STW by using a wide‐range of inorganic conditions . In these publications, we disclosed IWV as a product, but did not discuss the material further.…”

Section: Introductionmentioning

confidence: 99%

“…We have recently been examiningt he use of diquaternary OSDAs, and have reported products such as *BEA, CIT-7, CIT-8P, CIT-10, STF,a nd STW by using aw ide-range of inorganic conditions. [23][24][25] In these publications, we disclosedIWV as ap roduct, but did not discuss the materialf urther. Herein,w er eport the synthesis and characterization of aluminosilicate IWV across ab road compositional range in both fluoridea nd hydroxide media, as well as titanogermanosilicate IWV in fluoridem edia.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis, Characterization, and Catalytic Behavior of a Large‐Pore Zeolite with the IWV Framework

Schmidt

Chen

Brand

et al. 2016

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

Large‐pore microporous materials are of great interest to process bulky hydrocarbon and biomass‐derived molecules. ITQ‐27 (IWV) has a two‐dimensional pore system bounded by 12‐membered rings (MRs) that lead to internal cross‐sections containing 14 MRs. Investigations into the catalytic behavior of aluminosilicate (zeolite) materials with this framework structure have been limited until now due to barriers in synthesis. The facile synthesis of aluminosilicate IWV in both hydroxide and fluoride media is reported herein using simple, diquaternary organic structure‐directing agents (OSDAs) that are based on tetramethylimidazole. In hydroxide media, a zeolite product with Si/Al=14.8–23.2 is obtained, while in fluoride media an aluminosilicate product with Si/Al up to 82 is synthesized. The material produced in hydroxide media is tested for the hydroisomerization of n‐hexane, and results from this test reaction suggest that the effective pore size of zeolites with the IWV framework structure is similar to but slightly larger than that of ZSM‐12 (MTW), in fairly good agreement with crystallographic data.

show abstract

Synthesis of the RTH-type layer: the first small-pore, two dimensional layered zeolite precursor

Abstract: The “rth” type layer is the first porous 2D zeolite layer; it forms zeolite RTH via topotactic condensation or can be pillared to create a thermally stable, expanded pore material.

Cited by 34 publications

References 49 publications

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Two-Dimensional Zeolite Materials: Structural and Acidity Properties

Introduction to the Zeolite Structure-Directing Phenomenon by Organic Species: General Aspects

Facile Synthesis, Characterization, and Catalytic Behavior of a Large‐Pore Zeolite with the IWV Framework

Contact Info

Product

Resources

About