A5067483266- Zeolite Catalysis and Synthesis
- Membrane Separation and Gas Transport
- Metal-Organic Frameworks: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Covalent Organic Framework Applications
- Carbon Dioxide Capture Technologies
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Membrane Separation Technologies
- Hydrology and Watershed Management Studies
- Advanced Battery Materials and Technologies
- Advanced biosensing and bioanalysis techniques
- MXene and MAX Phase Materials
- Lignin and Wood Chemistry
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Carbon dioxide utilization in catalysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Water Quality and Pollution Assessment
- Membrane-based Ion Separation Techniques
- Nanomaterials for catalytic reactions
- Fish Ecology and Management Studies
- Muon and positron interactions and applications
Korea University
2016-2025
Seoul Institute
2016-2021
Government of the Republic of Korea
2016-2021
Pohang University of Science and Technology
2000-2019
Gangneung–Wonju National University
2017
Tottori University
2012-2014
Pusan National University
2013
Japan Science and Technology Agency
2013
University of Minnesota
2005-2010
Twin Cities Orthopedics
2005-2008
Improving membrane durability associated with fouling and chlorine resistance remains one of the major challenges in desalination technology. Here, we demonstrate that attractive features graphene oxide (GO) nanosheets such as high hydrophilicity, chemical robustness, ultrafast water permeation can be harnessed for a dual-action barrier coating layer enhances to both chlorine-induced degradation polyamide (PA) thin-film composite (TFC) membranes while preserving their separation performance....
Microporous molecular sieve catalysts and adsorbents discriminate molecules on the basis of size shape. Interest in films stems from their potential for energy-efficient membrane separations. However, grain boundary defects, formed response to stresses induced by heat treatment, compromise selectivity creating nonselective transport pathways permeating molecules. We show that rapid thermal processing can improve separation performance thick columnar a certain zeolite (silicalite-1)...
A framework en-Mg2(dobpdc) (1-en; en = ethylenediamine) functionalized with the primary amine was prepared via postmodification. From synchrotron PXRD data, it is revealed that cell parameters change upon grafting of and CO2 uptake. The adsorbed amount 1-en 4.57 mmol g−1 (16.7 wt%) at 25 °C 1 bar decreases to 3.00 (11.7 150 °C. Noticeably, shows a significant uptake (3.62 g−1, 13.7 0.15 bar, which comparable partial pressure post-combustion flue gas. capacity 0.39 mbar, close atmospheric...
The electrochemical synthesis of NH3 by the nitrogen reduction reaction (NRR) at low temperature (<65 °C) and atmospheric pressure using nanosized γ-Fe2O3 electrocatalysts were demonstrated. activity selectivity catalyst was investigated both in a 0.1 M KOH electrolyte when incorporated into an anion-exchange membrane electrode assembly (MEA). In half-reaction experiment conducted electrolyte, presented faradaic efficiency 1.9% weight-normalized 12.5 nmol h–1 mg–1 0.0 VRHE. However, toward...
Zeolites are well known for their ordered microporous networks, good hydrothermal stability, large surface area, high acidity and selectivity. These excellent properties make zeolites extremely useful petrochemical processes refining. However, the presence of only channels also restricts diffusion reactants products into out especially limiting zeolite applications involving bulky molecules. The importance developing hierarchical has attracted great attention in recent years due to prospect...
As a subset of the metal–organic frameworks, zeolitic imidazolate frameworks (ZIFs) have potential use in practical separations as result flexible yet reliable control over their pore sizes along with chemical and thermal stabilities. Among many ZIF materials, we explored effect treatments on ZIF-7 structure, known for its promising characteristics toward H2 separations; (0.29 nm) are desirable molecular sieving, favoring (0.289 CO2 (0.33 nm). Although thermogravimetric analysis indicated...
Oriented assembly of zeolite crystals on a porous support followed by secondary growth leads to continuous, thin, uniformly oriented films (see picture for cross-sectional SEM image) MFI with the 5.1×5.5-Å zigzag channels perpendicular support. These a-oriented along their previously reported b-oriented counterparts are first set thin molecular-sieve membranes uniform but drastically different orientations. Molecular-sieve attracting research interest because emerging applications as...
We report for the first time that ZIF-8 crystals undergo an Ostwald-ripening-like process without degradation in presence of a ligand vapor. The ripening is dependent on defect density crystals: more defective amenable to ripening. was adapted synthesize ultra-thin membranes by vapor-phase secondary growth.
Chabazite (CHA)-type zeolites are promising for the separation of CO2 from larger molecules, such as N2 (relevant to postcombustion carbon capture) and CH4 natural gas/biogas upgrading). In particular, pore size CHA (0.37 × 0.42 nm2) can recognize slight molecular differences between (0.33 nm) (0.364 or (0.38 thus allowing in favor through membranes. Furthermore, siliceous constituents zeolite reduce adsorption capacity toward smaller H2O molecule (0.265 and, thus, permeation rate. This is...
Continuous MFI-type zeolite membranes were fabricated on porous stainless steel tube supports by secondary (seeded) growth. The physical attachment of seed particles was initiated through sonication assistance unmodified supports. Despite a sparse layer, single hydrothermal growth step reliably led to c-/h0h-out-of-plane-oriented pure-silica MFI membranes. Rapid thermal processing applied as-synthesized membranes, extending the findings previous report controlling density grain boundary...
The reversible capacity of Chevrel Mo6S8 cathode can be increased by the simple addition Cu metal to electrodes. However, exact reaction mechanism additional for and mixture has not been clearly understood yet. To clarify this unusual behavior, we synthesize a novel nanoparticle/graphene composite preparation electrode. We thoroughly investigate electrochemical behaviors with relevant structural verifications during Mg2+ insertion extraction. in situ formation CuxMo6S8 is observed,...
An oriented, hydrophobic membrane made of a decadodecasil 3 rhombohedral (DDR) zeolite (0.36 nm) could separate CO<sub>2</sub>(0.33 from larger N<sub>2</sub>(0.364 reliably.
It is quite challenging to avoid microdefect formation during hydrothermal growths and/or calcination processes, while manufacturing high-quality zeolite membranes in a reproducible manner. Even less than 1% of defects, which generally provide nonselective pathways, will considerably worsen the intrinsic, high molecular sieving-based separation performance continuous membrane. Herein, we propose simple and reliable method for blocking defects using water-soluble dye molecules, were...
A composite electrode containing a zeolite (ZSM-5) embedded Li 6 PS 5 Cl solid electrolyte, where can act as scavenger for both toxic H 2 S gas and moisture is designed realizing high-performance all-solid-state batteries (ASSBs) with improved cycle performance.
In this study, the catalytic activities of three types zeolitic imidazolate framework-8 (ZIF-8) (two were synthesized in aqueous and methanolic media, while other was commercially available) with respect to CO2 cycloaddition epichlorohydrin evaluated. Surprisingly, only ZIF-8 that an medium showed a marked performance, leading generation desired product, chloropropene carbonate. On contrary, two little no activity. It is conjectured water molecules occluded inside as-synthesized triggered...