The conditions required to produce zeolites with low framework density and extra-large pores are discussed. Correlations between framework stability and geometrical and topological descriptors are presented. An attempt has been made to rationalize the synthesis of extra-large-pore zeolites in terms of the synthesis mechanism, the directing effect of the organic structure directing agent (OSDA), the framework atoms, and the gel concentration. Extra-large-pore zeolites, including the recently discovered chiral mesoporous ITQ-37, are described and their catalytic and adsorption properties discussed. Finally, strategies are presented for the preparation of extra-large-pore zeolites with different pore topologies that can fulfill pre-established catalytic and adsorption targets.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.200904016 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Utilization of Three-Dimensional Electron Diffraction for Structure Determination of Extra-Large-Pore Zeolites.
Small Methods
November 2024
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
The development of extra-large-pore (ELP) zeolites is crucial for industries of petrochemical catalysis, notably in processes like diesel cracking and hydrocracking of multi-carbon hydrocarbon substrates. The catalytic performance and selectivity of these zeolites depend heavily on their specific porous structures, making precise structure determination highly essential for understanding their properties and functionalities. However, the complex structures of ELP zeolites pose significant challenges for characterization.
View Article and Find Full Text PDFSynthesis and Structure Determination by 3D Electron Diffraction of the Extra-large Pore Zeolite ITQ-70.
Angew Chem Int Ed Engl
January 2025
Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de, València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos s/n, 46022, Valencia, Spain.
In this study, we present the synthesis, characterization, and structural analysis of a novel zeolite, ITQ-70, using 3D electron diffraction. This unique material was synthesized under alkaline conditions, employing tetrakis(diethylamino)phosphonium as an organic structure-directing agent, leading to the formation of a pure silica zeolite. ITQ-70 is distinguished by its extra-large pore apertures, which extend along all three axes and intersect one to the other.
View Article and Find Full Text PDFOn the Origin of Enantioselectivity in Chiral Zeolite Asymmetric Catalyst GTM-3: Host-Guest Transfer of Chirality.
ACS Appl Mater Interfaces
October 2024
Instituto de Catálisis y Petroleoquímica, Consejo Superior de Investigaciones Científicas (ICP-CSIC), c/Marie Curie 2, Madrid 28049, Spain.
Knowledge of how extra-large-pore chiral zeolite asymmetric catalysts based on the -ITV framework imprint their chirality during a catalytic reaction is crucial in order to spread the scope for the catalytic enantioselective production of chiral compounds of interest. In this work, we have carried out a combined experimental and computational study on the catalytic activity of antipode GTM-3 catalysts during the ring-opening of -stilbene oxide with 1-butanol. Identification of the enantiomers of all the chiral species unraveled a surprising catalytic behavior: these chiral catalysts promote the transformation of one enantiomer of -stilbene oxide in the corresponding product (with inversion of configuration of the attacked C) via an S2 mechanism, and at the same time, the transformation of the other enantiomer of -stilbene oxide via an S1-like mechanism into the (with retention of configuration) and secondary products (diphenylacetaldehyde via rearrangement and derived products).
View Article and Find Full Text PDFInterchain-expanded extra-large-pore zeolites.
Nature
April 2024
Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.
Stable aluminosilicate zeolites with extra-large pores that are open through rings of more than 12 tetrahedra could be used to process molecules larger than those currently manageable in zeolite materials. However, until very recently, they proved elusive. In analogy to the interlayer expansion of layered zeolite precursors, we report a strategy that yields thermally and hydrothermally stable silicates by expansion of a one-dimensional silicate chain with an intercalated silylating agent that separates and connects the chains.
View Article and Find Full Text PDFConfinement of CsPbBr Perovskite Nanocrystals into Extra-large-pore Zeolite for Efficient and Stable Photocatalytic Hydrogen Evolution.
Angew Chem Int Ed Engl
April 2024
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 130012, Changchun, China.
Metal halide perovskites (MHPs), renowned for their outstanding optoelectronic properties, hold significant promise as photocatalysts for hydrogen evolution reaction (HER). However, the low stability and insufficient exposure of catalytically active sites of bulky MHPs seriously impair their catalytic efficiency. Herein, we utilized an extra-large-pore zeolite ZEO-1 (JZO) as a host to confine and stabilize the CsPbBr nanocrystals (3.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!