A5015834000- Zeolite Catalysis and Synthesis
- Metal-Organic Frameworks: Synthesis and Applications
- Mesoporous Materials and Catalysis
- Catalytic Processes in Materials Science
- Covalent Organic Framework Applications
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Nanomaterials for catalytic reactions
- Chemical Synthesis and Characterization
- Thermochemical Biomass Conversion Processes
- Membrane Separation Technologies
- Surfactants and Colloidal Systems
- Advancements in Battery Materials
- Polymer Science and PVC
- Material Properties and Applications
- Pigment Synthesis and Properties
- Catalysis and Oxidation Reactions
- Microfluidic and Capillary Electrophoresis Applications
- Photonic Crystals and Applications
- Membrane Separation and Gas Transport
- biodegradable polymer synthesis and properties
- Aerogels and thermal insulation
- Advanced Polymer Synthesis and Characterization
- Semantic Web and Ontologies
- Advanced Database Systems and Queries
United States Army Combat Capabilities Development Command
2022
DEVCOM Army Research Laboratory
2018-2022
University of Maryland, College Park
2011-2019
Park University
2016
A dual template synthesis strategy was employed to achieve one-step design of meso- and microporous MFI nanosheet assemblies with tailored morphology, mesoporosity, catalytic activity. molecular (tetrapropylammonium hydroxide, TPAOH) a polyquaternary ammonium surfactant ([C22H45–N+(CH3)2–C6H12–N+(CH3)2–C6H13]Br2, C22–6–6) were used as cotemplates in the composition 30Na2O/1Al2O3/100SiO2/10C22–6–6/xTPAOH/4000H2O/18H2SO4. By tuning concentration TPAOH (x) from 0 20, morphology as-obtained...
A zeolite@metal–organic framework (ZSM-5@UiO-66) core–shell composite has been synthesized for the first time by solvothermal growth of UiO-66 on surface ZSM-5 particles. The acidity from and basicity amine groups in obtained post-synthetic modification metal clusters, endow a bifunctionality ZSM-5@UiO-66 cascade reactions.
Organic pillared MFI zeolite has been synthesized by detemplation of diquaternary ammonium surfactant ([C22H45–N+(CH3)2–C6H12–N+(CH3)2–C6H13]Br2, C22-6-6) and intercalation arylic silsesquioxane (1,4-bis(triethoxysilyl)benzene, BTEB) molecules between multilamellar layers. The acid extraction UV light radiation were sequentially employed for removal C22-6-6 located not only layers but also in the micropores. template using a nonthermal calcination method prevents condensation external...
The effects of zeolite micropore topology, mesoporosity, and acidity on the hydrolysis polysaccharides were probed in reactions sucrose over a variety catalysts (FER, MFI, MOR, MWW, BEA, FAU, pillared MFI (PMFI), MWW (PMWW)). measured rate microporous zeolites varied by factor ~100 following trend FER < MOR ~ BEA indicating that increases with increasing sizes. presence mesoporosity PMFI PMWW enhanced rates ~2 comparison zeolites, which may result from acid site accessibility mitigated...
Catalytic fast pyrolysis (CFP) using HZSM-5 zeolite catalysts serves as a promising route for the production of renewable chemicals from lignocellulosic biomass. However, this reaction is limited by formation coke, which can exceed 40% carbon atoms present in raw biomass feedstock. The role structural parameters on coking remains unclear with both internal micropore diffusion and external mass transfer limitations hypothesized to actively contribute deposition. Here, we decouple these...
A one-step dual template strategy was employed to achieve the facile synthesis of hybrid lamellar-bulk MFI (HLBM) zeolite, consisting a lamellar zeolite structure on surface bulk core. Tetrapropyl ammonium hydroxide (TPAOH) and diquarternary surfactant ([C22H45–N+(CH3)2–C6H12–N+(CH3)2–C6H13]Br2, C22-6-6) with composition 100SiO2/xC22-6-6/36TPAOH/4000H2O used as in HLBM synthesis. The influences several parameters formation were investigated, including concentration C22-6-6, hydrothermal...
Incorporation of zeolite nanoparticles into nanocomposite membranes is advantageous with respect to enhancing membrane permeability by providing preferential water flow paths through the subnanometer porous structure while maintaining excellent separation capability. We present a layer-by-layer assembly approach effectively incorporate membranes. Negatively charged Linde type A (LTA) were sandwiched between two different polyelectrolyte layers, negatively poly(acrylic acid) (PAA) and...
Adsorption assisted photocatalysis over pillared lamellar zeolite.
Abstract A detailed model is presented to analyze the phase inversion in dispersion polymerizations of methyl methacrylate (MMA) non‐polar solvents. The reaction conditions under which polymer particles lose stability and system inverts are investigated. At high solvent/monomer ratios, well‐defined micron‐sized produced even absence stabilizer. However, low ratios or stabilizer concentrations yield porous structures after a massive agglomeration precipitating particles. To quantify...
Abstract The dispersion polymerization of methyl methacrylate (MMA) has been studied in a nonpolar hydrocarbon solvent at low temperature using N,N‐dimethylaniline (DMA) and lauroyl peroxide (LPO) as redox initiation system. To explain the heterogeneous kinetic characteristics process, reaction locus experimentally theoretically investigated. evolutions monomer conversion, polymer molecular weight distribution (MWD), particle morphology were measured throughout polymerization. It was found...
Abstract Spherical silica particles with pseudo‐inverse opal structure are synthesized by using pomegranate‐like polymer microparticles as templates. A micro‐dispersion polymerization occurring in the suspended monomer droplets presence of a precursor leads to formation nearly monodisperse sub‐particles about 1 µm size, randomly‐packed within 30–100 particle. The is followed an acid‐catalyzed reaction that induces interstices between PIOS eventually produced selectively removing template...