98%
921
2 minutes
20
Synthetic conditions for the zeolitic octahedral metal oxide based on vanadotungstate are studied. The temperature, time, acidity, / ratio, cation species, and concentration affect the resulting materials. The study shows that mixing tungstate and VO in an aqueous solution generates cubane units ([WO]) at room temperature. The cubane units assemble with VO immediately to form a solid with an amorphous phase and nonporosity, which further crystallizes under a hydrothermal condition to form the crystalline microporous vanadotungstate. The zeolitic vanadotungstates act as effective adsorbents for the separation of propylene/propane. The active materials effectively separate propylene/propane even at high temperatures and high humidities.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1021/acs.inorgchem.2c01238 | DOI Listing |
Small
July 2025
Artie McFerrin Department of Chemical Engineering and Department of Materials Science and Engineering, Texas A&M University, 3122 TAMU, College Station, TX, 77843-3122, USA.
Zeolitic imidazolate framework-8 (ZIF-8) is a promising material for CH/CH separation; however, its inherent linker flexibility compromises molecular sieving effect. To address this limitation, a novel ZIF-8, namely heterogeneous ZIF-8 (hZIF-8), is developed, consisting of nanocrystalline ZIF-8 phases with a minor amorphous polymer component introduced via in situ coordination. hZIF-8 is synthesized through a Lewis-acid-catalyzed cationic ring-opening polymerization of tetrahydrofuran (THF), generating polytetramethylene ether glycol (PTMEG) chains that competitively coordinate with zinc ions during ZIF-8 crystallization.
View Article and Find Full Text PDFJ Phys Chem B
May 2025
Artie McFerrin Department of Chemical Engineering, Texas A&M University, 3122 TAMU, College Station, Texas 77843-3122, United States.
In this study, we introduce a set of coarse-grained (CG) force field parameters for simulating a series of 6FDA-based polyimides. Utilizing atomistic descriptors, we developed CG models that accurately predict the specific volume of the polymers under investigation. Our findings suggest that certain parameters, particularly those associated with specific diamines, can be employed to predict properties such as density using a multiple linear regression.
View Article and Find Full Text PDFInorg Chem
March 2025
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Adsorptive separation of propylene/propane using porous materials offers a promising alternative to energy-intensive cryogenic distillation. Molecular sieving-type adsorbents are considered the most ideal materials due to their superior selectivity and efficiency, but many suffer from limited adsorption capacity and slow diffusion due to small pore sizes. Here, we present a solvent-blocking strategy on NbOFFIVE-1-Ni (KAUST-7), the inaugural reported metal-organic framework for propylene/propane separation based on molecular sieving.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
April 2025
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China.
Light-responsive porous liquids (LPLs) attract significant attention for their controllable gas uptake under light irradiation, while their preparation has remained a great challenge. Here we report the fabrication of type II LPLs with enhanced light-responsive efficiency by tailoring the host's functionality for the first time. The functionality of light-responsive metal-organic cage (MOC-RL, constructed from dicopper and responsive ligands) is modified by introducing the second long-chain alkyl ligand, producing MOC-RL-AL as a new host.
View Article and Find Full Text PDFNat Commun
November 2024
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, P. R. China.
The fabrication of metal-organic framework (MOF) membranes with high propylene/propane selectivity, high mechanical endurance and ease of scaling up always remains a challenge. Inspired by the ubiquitous biological wear-resistant structure, here we show ZIF-67 membranes with a tangential-normal interlaced structure (TN-ZIF-67) for one-step acquisition of polymer-grade propylene, which is endowed with the merits of intergranular defect elimination, partial ZIF-67 lattice flexibility restriction and anti-wear of the membrane surface. The TN-ZIF-67 membrane exhibits an optimal propylene/propane mixture separation factor of 221, and the separation performance remained unchanged after 1.
View Article and Find Full Text PDF