Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Synthesis of a pentasil-type zeolite with ultra-small few-unit-cell crystalline domains, which we call FDP (few-unit-cell crystalline domain pentasil), is reported. FDP is made using bis-1,5(tributyl ammonium) pentamethylene cations as structure directing agent (SDA). This di-quaternary ammonium SDA combines butyl ammonium, in place of the one commonly used for MFI synthesis, propyl ammonium, and a five-carbon nitrogen-connecting chain, in place of the six-carbon connecting chain SDAs that are known to fit well within the MFI pores. X-ray diffraction analysis and electron microscopy imaging of FDP indicate ca. 10 nm crystalline domains organized in hierarchical micro-/meso-porous aggregates exhibiting mesoscopic order with an aggregate particle size up to ca. 5 μm. Al and Sn can be incorporated into the FDP zeolite framework to produce active and selective methanol-to-hydrocarbon and glucose isomerization catalysts, respectively.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8457084 | PMC |
| http://dx.doi.org/10.1002/anie.202104574 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Designable Synthesis of Layered Silicates and Tunable Interlayer Expanded to Zeolites.
Small
July 2024
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Rd. 3663, Shanghai, 200062, P. R. China.
Layered zeolitic silicates and corresponding interlayer-expanded porous materials exhibit attractive application potential in wide fields. Nonetheless, designable synthesis and structure analysis of layered silicates remain challenging. Herein, two kinds of layered silicates are synthesized using different di-quaternary ammonium-type organic structure-directing agents (OSDAs).
View Article and Find Full Text PDFNon-Equilibrium Kinetic States of a [2]Rotaxane-Based Molecular Shuttle Controlled by Acid Concentrations.
Angew Chem Int Ed Engl
December 2022
Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, China.
A [2]rotaxane-based molecular shuttle with an acid-responsive asymmetric macrocycle on a symmetric dumbbell axle is reported. Upon adding TFA, the macrocycle, namely the amine naphthotube, is protonated and translocates from the di(quaternary ammonium) station to the triazole stations because of electrostatic repulsion and weakened binding. The shuttling kinetics are slow due to the steric hindrance caused by the ethyl group on the quaternary ammonium center and can be followed by H NMR spectroscopy.
View Article and Find Full Text PDFStructure Elucidation and Computationally Guided Synthesis of SSZ-43: A One-Dimensional 12-Ring Zeolite with Unique Sinusoidal Channels.
Angew Chem Int Ed Engl
March 2022
Chevron Technical Center, 100 Chevron Way, Richmond, CA 94801, USA.
The structure of zeolite SSZ-43 was determined by 3D electron diffraction, synchrotron X-ray powder diffraction, and high-resolution transmission electron microscopy. The SSZ-43 framework forms one-dimensional, sinusoidal 12-ring channels from 5 6 butterfly units commonly found in other zeolites, but with unique 6.5×6.
View Article and Find Full Text PDFFew-Unit-Cell MFI Zeolite Synthesized using a Simple Di-quaternary Ammonium Structure-Directing Agent.
Angew Chem Int Ed Engl
August 2021
Department of Chemical and Biomolecular Engineering &, Institute for NanoBioTechnology, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD, 21218, USA.
Synthesis of a pentasil-type zeolite with ultra-small few-unit-cell crystalline domains, which we call FDP (few-unit-cell crystalline domain pentasil), is reported. FDP is made using bis-1,5(tributyl ammonium) pentamethylene cations as structure directing agent (SDA). This di-quaternary ammonium SDA combines butyl ammonium, in place of the one commonly used for MFI synthesis, propyl ammonium, and a five-carbon nitrogen-connecting chain, in place of the six-carbon connecting chain SDAs that are known to fit well within the MFI pores.
View Article and Find Full Text PDFDensely Quaternized Fluorinated Poly(fluorenyl ether)s with Excellent Conductivity and Stability for Vanadium Redox Flow Batteries.
ACS Appl Mater Interfaces
April 2021
College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China.
Article Synopsis
- Cationic group distribution and elemental composition are crucial for improving the conductivity and stability of anion exchange membranes (AEMs) used in vanadium redox flow batteries (VRFBs).
- The study introduces a new type of polymer called DQA-TAPFE, created by modifying a fluorinated polymer with di-quaternary ammonium side chains, resulting in enhanced micro-phase separation that improves performance.
- DQA-TAPFE-20 demonstrated a significantly higher ion conductivity and energy efficiency in VRFB applications compared to traditional membranes like Nafion 212, making it a promising alternative for battery technologies.