A5064528976- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Zeolite Catalysis and Synthesis
- Metal-Organic Frameworks: Synthesis and Applications
- Covalent Organic Framework Applications
- Carbon Dioxide Capture Technologies
- Chemical Synthesis and Characterization
- Membrane Separation and Gas Transport
- Catalysis and Hydrodesulfurization Studies
- Catalysis and Oxidation Reactions
- Advanced NMR Techniques and Applications
- Crystallography and molecular interactions
- Enzyme Structure and Function
- Machine Learning in Materials Science
Pohang University of Science and Technology
2015-2023
University of St Andrews
2023
Korea Post
2020
Framework deformation, driven by the cations in channels, determines CO<sub>2</sub> ad- and desorption behavior of zeolites. This allows to tune zeolite properties efficient temperature swing adsorption processes.
UCSB-6 (framework type SBS) and UCSB-10 (SBT), two three-dimensional phosphate-based molecular sieves with supercages accessible through 12-ring (circumscribed by 12 tetrahedral atoms) windows, are structurally similar to the hexagonal cubic polytypes of faujasite or zeolite Y, an industrially relevant catalyst, but cage structures substantially different. Nonetheless, their inherent thermal instability has precluded any catalytic application so far. By using multiple inorganic cation charge...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPST-29: A Missing Member of the RHO family Embedded Isoreticular ZeolitesHwajun LeeHwajun LeeCenter for Ordered Nanoporous Materials Synthesis, Division Environmental Science and Engineering, POSTECH, Pohang 37673, KoreaMore by Hwajun Lee, Jiho ShinJiho ShinCenter Shin, Wanuk ChoiWanuk ChoiCenter Choi, Hyun June ChoiHyun Taimin YangTaimin YangInorganic Structural Chemistry Berzelii Center EXSELENT on Porous Materials, Department Chemistry,...
Abstract An understanding of the CO 2 adsorption mechanisms on small‐pore zeolites is practical importance in development more efficient adsorbents for separation from N or CH 4 . Here we report that isotherms at 25–75 °C cesium‐exchanged phillipsite zeolite with a Si/Al ratio 2.5 (Cs‐PHI‐2.5) are characterized by rectilinear step shape: limited uptake low pressure (P CO2 ) followed highly cooperative critical pressure, above which rapidly approaches capacity (2.0 mmol g −1 ). Structural...
Silicoaluminophosphate (SAPO) molecular sieves are an important class of microporous materials and useful for industrial catalysis separations. They have been synthesized exclusively by the use expensive environmentally unfriendly organic structure-directing agents. Now synthesis SAPO is reported with MER, EDI, GIS, ANA topologies under wholly inorganic conditions. Multinuclear MAS NMR analyses demonstrate presence Si, Al, P atoms in their frameworks. These all unusually high framework...
The structure model of an ABC-6 family zeolite with the 4-layer stacking sequence AABC was first proposed in 1981, but it has remained undiscovered so far. Here, we report synthesis PST-33, which is a small-pore aluminosilicate (Si/Al = 4.1) this framework topology, using 5-azonia-spiro[4.4]nonane ions as organic structure-directing agent via so-called multiple inorganic cation approach, and its solved by single-crystal X-ray crystallography. PST-33 contains two-dimensional 8-membered ring...
Abstract The CO 2 adsorption behavior at 25–75 °C and 0–1.0 bar of various alkali cation‐exchanged forms merlinoite (framework type MER) zeolites with Si/Al=2.3 3.8 is described. isotherms 25 on the Na + , K Rb Cs MER zeolite are characterized by a clear step, pressure which differs notably according to their extraframework cations. Structural analysis shows that former three includes relocation gating cations high site occupancy remarkable concomitant structural breathing. We define this...
We have recently been successful in predicting and synthesizing a series of body-centered cubic zeolites with expanding structural complexity embedded isoreticular structures, termed the RHO family. Here we propose plausible formation pathway for ECR-18, ZSM-25, PST-20, three members this zeolite family, presence tetraethylammonium ions as an organic structure-directing agent, based on 13C MAS NMR, IR, CO2 adsorption results obtained from solid products recovered function time during their...
Abstract Silicoaluminophosphate (SAPO) molecular sieves are an important class of microporous materials and useful for industrial catalysis separations. They have been synthesized exclusively by the use expensive environmentally unfriendly organic structure‐directing agents. Now synthesis SAPO is reported with MER, EDI, GIS, ANA topologies under wholly inorganic conditions. Multinuclear MAS NMR analyses demonstrate presence Si, Al, P atoms in their frameworks. These all unusually high...
Abstract The structure solution, prediction, and targeted synthesis of a family embedded isoreticular zeolites (EIZs) with expanding structural complexity, denoted the RHO family, were reported recently. Here, naming building rules body‐centered cubic EIZs lta cage as lattice point are presented. rearrangement pair pau d8r cages between two its repetitive insertion, combined strong reflections fragment methods, allows creation three other new zeolite families, designated HPO, RHO(b), KFI...
Abstract An understanding of the CO 2 adsorption mechanisms on small‐pore zeolites is practical importance in development more efficient adsorbents for separation from N or CH 4 . Here we report that isotherms at 25–75 °C cesium‐exchanged phillipsite zeolite with a Si/Al ratio 2.5 (Cs‐PHI‐2.5) are characterized by rectilinear step shape: limited uptake low pressure (P CO2 ) followed highly cooperative critical pressure, above which rapidly approaches capacity (2.0 mmol g −1 ). Structural...
Potassium merlinoite with a framework Si/Al ratio of 2.9 (K-MER-2.9) is synthesized using K-MER higher 3.8 (K-MER-3.8) as seed crystals. The CO2 adsorption properties K-MER-2.9 are investigated at 25−45 °C and 0−1.0 bar compared four other zeolites different ratios (1.7-4.2) in order to investigate the effect (or extraframework cation content) on mechanism MER-type zeolites. While CO 2 uptake (0.8 mmol g-1) 25 1.0 K-MER-1.7 negligible, due large number gating cations occupying 8-membered...