A5059828880- Graphene research and applications
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- Carbon Nanotubes in Composites
- Catalysts for Methane Reforming
- Catalysis and Oxidation Reactions
- Supercapacitor Materials and Fabrication
- Graphene and Nanomaterials Applications
- Advancements in Battery Materials
- Conducting polymers and applications
- Zeolite Catalysis and Synthesis
- Catalysis and Hydrodesulfurization Studies
- Diamond and Carbon-based Materials Research
- Ammonia Synthesis and Nitrogen Reduction
- Petroleum Processing and Analysis
- Electrocatalysts for Energy Conversion
- Carbon and Quantum Dots Applications
- Fuel Cells and Related Materials
- Covalent Organic Framework Applications
- Carbon Dioxide Capture Technologies
- Thermal and Kinetic Analysis
- Polymer Nanocomposite Synthesis and Irradiation
- Asymmetric Hydrogenation and Catalysis
- Boron and Carbon Nanomaterials Research
- Fullerene Chemistry and Applications
L.V. Pisarzhevskii Institute of Physical Chemistry
2016-2025
National Academy of Sciences of Ukraine
2016-2025
This study unveils a novel property of polyaniline by establishing its catalytic activity in heterogeneous hydrogenation with molecular hydrogen. Polyaniline was activated heat-treating at different temperatures hydrogen atmosphere. The sample treated 300 °C exhibited the highest for ethylene gas phase atmospheric pressure and p-nitrotoluene or α-methylstyrene liquid phase. XRD, HRTEM, Raman, XPS, UV-VIS, FTIR, elemental analysis data as well electrochemical indicate that is associated...
In this study, we explore the impact of graphene oxide (GO) concentration in aqueous suspension on specific surface area (SSA) multilayered reduced (RGO). A series GO suspensions were prepared, and subsequently subjected to reduction using hydrazine hydrate. Particle size for all obtained RGO samples does not exceed 10 μm averagely consisting 2–3 layers. Our findings demonstrate that, under consistent synthetic conditions, variation predominantly influences SSA values while other structural...
This study represents the catalytic properties of multi-walled carbon nanotubes (MWCNT) in direct conversion methanol. The high stability MWCNT at 550 оC, formation dimethyl ether...
Abstract The hydrogenation of acetylene was investigated on multiwalled carbon nanotubes (MWCNTs) with an average diameter 35 nm and prepared by chemical vapor deposition from ethylene. MWCNT structure surface‐oxygen‐containing functional groups were verified transmission electron microscopy, scanning X‐ray photoelectron spectroscopy, Raman Boehm titration. Significant differences in the surface functionalities MWCNTs found before after catalysis, but morphology did not change. During are...
High catalytic performance and stability of 3%FeO x /CNT catalyst prepared by colloid deposition FeO on CNT in the high-temperature WGSR.
Core-shell nanoparticles Fe@Fe3O4 supported on activated carbon (AC) and nanotubes (CNTs) have been studied by H2 temperature-programmed reduction (TPR). Nanoparticles with size of 6.5 nm were synthesized iron(II) oleate thermal decomposition colloid deposition method. The are characterized TEM IR. Reduction AC starts at 140?C, whereas CNTs 200?C. Moreover, gasification methane releasing 450?C, is negligible temperatures up to 800?C. All these findings illustrate a strong difference in the...
This work shows, for the first time, that multi-walled carbon nanotubes (MWCNTs) exhibit catalytic activity in ethylene hydrogenation. MWCNTs with average diameter of 35 nm were prepared by CVD from as a source at 700 °C. TEM, SEM, and XRD indicate are characterized sufficiently high defectiveness. FTIR highlights process occurs presence hydroxyl carbonyl surface groups. We demonstrate stability temperatures up to 400
A series of carbon-encapsulated Ni nanoparticles deposited on carbon nanotubes (Ni@CNT) with various concentrations were prepared by a simple impregnation method. The structural and functional properties Ni@CNT determined typical set physicochemical methods. catalytic performance was evaluated in the model reactions ethylene hydrogenation dehydrogenation ethane as reverse reaction, well liquid-phase p-nitrotoluene α-methylstyrene. surface samples does not contain corresponds to CNT. content...
This paper presents a study of the effect 1 MeV electron irradiation on localization charge carriers in graphene quantum dots (GQDs) located reduced oxide (RGO). The electrical properties were analyzed wide temperature range 4.2–340 K for fluences 0–160 × 1015 cm−2. length, dielectric permittivity, and density localized states estimated. It was found that conductivity parameters exhibit non-monotonic behavior depending fluences. can change several times vicinity fluence 10 cm−2 compared to...
We present the results of a study electrical properties macroscopic free-standing reduced graphene oxide paper (RGOP) with 60 % fraction sp2‑carbons at liquid helium temperatures. Graphene domains form an array quantum dots that determine material properties. At low temperatures, conductivity RGOP can be described by model tunneling charge carriers through disordered quasi-2D dot array. In temperature 4.2 K, are localized in due to Coulomb blockade. The effective localization length (~5–8...
We present the results of a study dielectric and electrical properties macroscopic reduced graphene oxide paper (RGOP) before after 1 MeV electron irradiation with low dose 1⋅1016 cm−2. It was found that Coulomb interaction affects transport charge carriers causes their strong localization within domains. The conductivity RGOP can be described by carrier tunneling through disordered quantum dot array. shown length decreases from 5–8 nm to 1–2 irradiation. Structural studies revealed...