A5020532334- Hydrogen Storage and Materials
- Ammonia Synthesis and Nitrogen Reduction
- Nanomaterials for catalytic reactions
- Organometallic Complex Synthesis and Catalysis
- Asymmetric Hydrogenation and Catalysis
- Hybrid Renewable Energy Systems
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Metal complexes synthesis and properties
- Catalytic Processes in Materials Science
- Polyoxometalates: Synthesis and Applications
- Nanocluster Synthesis and Applications
- Zeolite Catalysis and Synthesis
- Boron and Carbon Nanomaterials Research
- Electrocatalysts for Energy Conversion
- Carbon dioxide utilization in catalysis
- Catalysis and Oxidation Reactions
- Inorganic and Organometallic Chemistry
- Catalysis and Hydrodesulfurization Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Energetic Materials and Combustion
- Mesoporous Materials and Catalysis
- Catalytic Cross-Coupling Reactions
- Rocket and propulsion systems research
- Chemical Synthesis and Characterization
Middle East Technical University
2015-2024
Division of Chemistry
2023
Ankara (Czechia)
2015-2020
Colorado State University
2001-2016
Turkish Aerospace Industries (Turkey)
2014
Scientific and Technological Research Council of Turkey
2014
Brown University
2010
European Synchrotron Radiation Facility
2009
Max Planck Society
1988-2005
University of Kaiserslautern
1978-1997
Monodisperse nickel nanoparticles are prepared from the reduction of Ni(acac)2 with borane tributylamine in presence oleylamine and oleic acid. Without any special treatment to remove surfactants, as-synthesized Ni supported on Ketjen carbon support exhibit high catalytic activity hydrogen generation hydrolysis ammonia−borane (H3NBH3) complex a total turnover frequency value 8.8 mol H2·(mol Ni)−1·min−1. Such catalysis based represents promising step toward practical development H3NBH3 as...
A look back at LaMer's 1950 model of particle formation is undertaken (LaMer, V. K.; Dinegar, R. H. Theory, Production and Mechanism Formation Monodispersed Hydrosols. J. Am. Chem. Soc. 1950, 72, 4847–4854), a highly cited paper that has more than 1953 citations as March 2019. The nonmathematical, verbal version model, namely, the concepts "instantaneous" (or "burst") nucleation "diffusion-controlled" growth, continues to be heavily because, until recently, it was only known way try explain...
To start, a brief introduction is provided on the importance of transition-metal nanoclusters, need to develop and then apply methods rank nanocluster formation stabilizing abilities commonly employed anions, solvents, cations, polymers, somewhat confused literature stabilization. The fundamental surface-adsorbed anions in stabilization noted, reason present studies begin with study nanocluster-stabilizing anions. Next, five criteria, as well associated experimental methods, are developed...
Ruthenium(0) nanoparticles supported on multiwalled carbon nanotubes (Ru(0)@MWCNT) were in situ formed during the hydrolysis of ammonia–borane (AB) and could be isolated from reaction solution by filtration characterized ICP-OES, XRD, TEM, SEM, EDX, XPS techniques. The results reveal that ruthenium(0) size range 1.4–3.0 nm are well-dispersed nanotubes. They found to highly active catalyst hydrogen generation AB with a turnover frequency value 329 min–1. reusability experiments show...
Polymer-stabilized cobalt(0) nanoclusters were prepared from the reduction of cobalt(II) chloride in presence poly(N-vinyl-2-pyrrolidone) (PVP) stabilizer methanol solution. PVP-stabilized found to be stable solution and could isolated as solid material characterized by TEM, XPS, FT-IR, UV−visible electronic absorption spectroscopy. employed catalyst hydrolysis sodium borohydride ammonia-borane, which have been considered solid-state hydrogen storage materials for portable fuel cell...
Abstract Three‐dimensional (3D) porous metal and oxide nanostructures have received considerable interest because organization of inorganic materials into 3D nanomaterials holds extraordinary properties such as low density, high porosity, surface area. Supramolecular self‐assembled peptide were exploited an organic template for catalytic Pt‐TiO 2 nano‐network fabrication. A nanofiber aerogel was conformally coated with TiO by atomic layer deposition (ALD) angstrom‐level thickness precision....
Sodium borohydride, NaBH4, has been considered the most attractive hydrogen-storage material for portable fuel cell applications, as it provides a safe and practical means of producing hydrogen. In recent communication (Zahmakiran, M.; Ozkar, S. Langmuir 2008, 24, 7065), we have reported record total turnover number (TTON) 103 200 mol H2/mol Ru frequency (TOF) up to 33 000 x h obtained by using intrazeolite ruthenium(0) nanoclusters in hydrolysis sodium borohydride. Here report full details...
Determining the true, kinetically dominant catalytically active species, in classic benzene hydrogenation system pioneered by Maitlis and co-workers 34 years ago starting with [RhCp*Cl(2)](2) (Cp* = [η(5)-C(5)(CH(3))(5)]), has proven to be one of most challenging case studies quest distinguish single-metal-based "homogeneous" from polymetallic, "heterogeneous" catalysis. The reason, this study will show, is previous failure use proper combination of: (i) operando spectroscopy determine...
The hydrogenation of aromatics is a ubiquitous chemical transformation used in both the petrochemical and specialty industry important for generation clean diesel fuels. Reported herein discovery superior heterogeneous catalyst, terms catalytic activity, selectivity, lifetime solvent-free system under mild conditions (at 25 degrees C 42 +/- 1 psig initial H(2) pressure). Ruthenium(0) nanoclusters stabilized by nanozeolite framework as new material reproducibly prepared from borohydride...
Monodisperse Ni nanoparticles (NPs) have been synthesized by the reduction of nickel(II) acetylacetonate with borane-tributylamine complex in a mixture oleylamine and oleic acid. These NPs are an active catalyst for hydrolysis ammonia-borane (AB, H3N·BH3) under ambient conditions their activities dependent on chemical nature oxide support that they were deposited on. Among various oxides (SiO2, Al2O3, CeO2) tested, SiO2 was found to enhance NP catalytic activity due etching 3.2 nm giving...