?
Effects of Support Structure and Composition on the Activity of Cu–Ni Catalysts for Methanol Steam Reforming
Inorganic Materials. 2019. Vol. 55. No. 12. P. 1230-1236.
We have studied the catalytic activity of Cu–Ni bimetallic catalysts on yttrium-, tin-, zinc-, and niobium-doped zirconia and ceria supports for methanol steam reforming (MSR), a process for hydrogen production, and examined the effect of the nature of the dopants and annealing temperature on the structure and particle size of the oxide supports and the catalytic activity of the metal oxide composites. In all cases, the addition of heterovalent ions improved the catalytic activity of the materials for the MSR process in comparison with undoped zirconia. The highest hydrogen yield was reached in the case of catalysts doped with niobium and yttrium oxides.
Lytkina A.A. Л., Orekhova N.V. О., Ermilova M.M. Е. et al., International Journal of Hydrogen Energy 2019 Vol. 44 No. 26 P. 13310-13322
Results of hydrogen production study in methanol steam reforming (MSR) process with the use of Ru0.5eRh0.5 catalysts supported on different carbon materials: synthetic graphitelike material Sibunit, carbon black Ketjenblack EC600DJ, detonation nanodiamonds (DND) and ZrO2-based material with fluorite structure, doped with ceria, have been described. The samples have been tested in conventional flow reactor and ...
Added: November 18, 2019
Lytkina A. A., Orekhova N. V., Ermilova M. M. et al., International Journal of Hydrogen Energy 2018 Vol. 43 No. 1 P. 198-207
Metal oxide-stabilized zirconia supports (MxZr1-xO2-δ) with different dopants (M = Y, La, Ce) were prepared by coprecipitation method. Bimetallic CuNi and RuRh catalystssupported on MxZr1-xO2-δ were prepared by the sequential wetness impregnation method, for use in hydrogen production by methanol steam reforming. The effect of the nature and quantity of the dopant cation (M = Y, Ce) on the catalytic performance of zirconia supported metal catalysts was investigated. The activity of NiCu/YxZr1-xO2-(x/2) (x = 0.1–0.3) samples increases with an increase ...
Added: January 9, 2019
A. A. Efimova, Abramova T. A., Popov A. S., Russian Journal of General Chemistry 2021 Vol. 91 No. 10 P. 2079-2085
Interaction of the cationic polymer chitosan with anionic liposomes has been studied. The characteristics of the polycation-liposome complex have been determined by the phase state of the lipid membrane. Chitosan adsorbed on the surface of liquid liposomes has induced transmembrane migration of anionic lipid from the inner to the outer leaflet. Liquid liposomes have retained ...
Added: October 22, 2022
Szczerba M., Kalinichev A. G., Kowalik M., Applied Clay Science 2020 Vol. 188 P. 105497
The siloxane surface of uncharged clays is known to be hydrophobic, which is supported by strong experimental and theoretical evidence. For the siloxane surface of charged clays, like smectites, the picture is not as clear. We are aiming to clarify this issue by molecular simulations in which smectite surface hydrophobicity is quantified through the separate ...
Added: February 26, 2020
Prikhno I. A., Safronova E. Y., Stenina I. et al., Membranes and Membrane Technologies (Russia) 2020 Vol. 2 No. 4 P. 265-271
The transport properties of ion-exchange membranes depend on many factors, primarily, on ion-exchange capacity and chemical composition. Therefore, the correlation of transport properties with a single particular parameter is generally not quite strict. In this study, the dependence of transport properties of several perfluorinated sulfonated cation-exchange membranes that differ in side chain length and fraction ...
Added: August 31, 2020
Krot A. D., Vlasova I. E., Tararushkin E. et al., Minerals 2024 Vol. 14 No. 1 Article 109
A quantitative understanding of the molecular-scale mechanisms of radionuclide sorption on different clay minerals is crucial for the development and safe implementation of geological nuclear waste disposal technologies. We apply classical molecular dynamics (MD) computer simulations to study the adsorption of uranyl on the external basal surfaces of two typical clay models. In the illite ...
Added: January 25, 2024
Darya L. Gurina, Yury A. Budkov, Colloids and Surfaces A: Physicochemical and Engineering Aspects 2023 Vol. 676 Article 132200
This article reports on a full-atomic classical molecular dynamics simulation investigating the self-assembly process of reverse micelles in carbon tetrachloride and supercritical carbon dioxide (scCO2). The study explores the impact of solvent type, surfactant structure (sodium dodecyl sulfate and sodium bis(3,5,5-trimethyl-1-hexyl) sulfosuccinate), water/surfactant ratio, and surfactant concentration on the self-assembly, size, and shape of reverse ...
Added: August 8, 2023
High pressure synthesis and transport properties of a perfluorinated sulfocationic exchange membrane
Polunin E. V., Pogodina Y. E., Prikhno I. A. et al., Mendeleev Communications 2019 Vol. 29 No. 6 P. 661-662
A new perfluorinated sulfocationic polymer and a membrane based thereon have been produced using the thermally initiated high-pressure polymerization. The proton conductivity of obtained material is higher than that of commercial Nafion membranes and reaches 57 mS cm–1 at 21 C and 114 mS cm–1 at 79 C. ...
Added: November 18, 2019
Ilyin S., Kostyuk A., Anokhina T. et al., International Journal of Molecular Sciences 2023 Vol. 24 No. 9 Article 8057
The weak point of ionic liquids is their high viscosity, limiting the maximum polymer concentration in the forming solutions. A low-viscous co-solvent can reduce viscosity, but cellulose has none. This study demonstrates that dimethyl sulfoxide (DMSO), being non-solvent for cellulose, can act as a nominal co-solvent to improve its processing into a nanofiltration membrane by ...
Added: January 30, 2024
Trosheva K. S., Sorokina S. A., А.А. Efimova et al., Biochimica et Biophysica Acta - Biomembranes 2021 Vol. 1863 No. 12 Article 183761
Dendrimers are individual macromolecular compounds having a great potential for biomedical application. The key step of the cell penetration by dendrimers is the interaction with lipid bilayer. Here, the interaction between cationic pyridylphenylene dendrimer of third generation (D350+) and multicomponent liquid (CL/POPC), solid (CL/DPPC) and cholesterol-containing (CL/POPC/30% Chol) anionic liposomes was investigated by dynamic light ...
Added: October 5, 2022
Yurova P., Стенина И. А., Yaroslavtsev A. B., Russian Journal of Electrochemistry 2020 Vol. 56 P. 528-532
Composite materials based on heterogeneous membranes MK-40 modified by a thin layer of homogeneous cation-exchange perfluorinated sulfo membrane MF-4SK doped with 2 and 5% ceria are prepared. The transport characteristics of these membranes in different ionic forms are studied. It is shown that the conductivity of ionic forms of membranes increases in the sequence Li+ ...
Added: November 29, 2020
Tararushkin E., Pisarev V., Kalinichev A. G., Materials 2023 Vol. 16 No. 14 Article 5026
The nitrite admixtures in cement and concrete are used as corrosion inhibitors for steel reinforcement and also as anti-freezing agents. The characterization of the protective properties should account for the decrease in the concentration of free NO2− ions in the pores of cement concretes due to their adsorption. Here we applied the classical molecular dynamics computer ...
Added: July 21, 2023
Podshivaylov E., Maria A. Kniazeva, Alexander O. Tarasevich et al., Journal of Materials Chemistry C 2023 Vol. 11 No. 25 P. 8570-8576
In spite of decades of comprehensive studies phenomenon of single semiconductor colloidal quantum dots (QD) photoluminescence (PL) blinking require theoretical retreatment. Here we present enhanced model which proposes, that the blinking is caused by fluctuations in the rate of nonradiative relaxation due to temporal variations of the electron-phonon interaction coupling. The model quantitatively reproduces the ...
Added: May 16, 2023
Vlasova K. Y., Vishwasrao H., Abakumov M. A. et al., Scientific Reports 2020 Vol. 10 P. 4745
Remote nano-magneto-mechanical actuation of magnetic nanoparticles (MNPs) by non-heating extremely low frequency magnetic field (ELF MF) is explored as a tool for non-invasive modification of bionanomaterials in pharmaceutical and medical applications. Here we study the effects of ELF MF (30-160 Hz, 8-120 kA/m) on the activity and release of a model enzyme, superoxide dismutase 1 (SOD1) immobilized ...
Added: May 12, 2020
Budkov Y., Kalikin N., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2023 Vol. 107 No. 2 Article 024503
In this paper, we present a self-consistent field theory of macroscopic forces in spatially inhomogeneous flexible chain polyelectrolyte solutions. We derive an analytical expression for a stress tensor which consists of three terms: isotropic hydrostatic stress, electrostatic (Maxwell) stress, and stress rising from conformational entropy of polymer chains—conformational stress. We apply our theory to the ...
Added: February 15, 2023
Bari : Digilabs Pub., 2021
ASYS, the AIPEA School for Young Scientists. ASYS was successfully convened at the Andalusian Institute of
Earth Sciences (CSIC-UGR, Granada, Spain) on July 15 and 16, 2017, under the supervision of Dr. Claro Ignacio
Sainz Díaz, researcher of this centre, and in close connection to the 16th International Clay Conference in Granada
(ICC 2017). Young and not so-young ...
Added: September 5, 2021
Darya Gurina, Ekaterina Odintsova, Krestyaninov M. A. et al., Journal of Molecular Liquids 2023 Vol. 390 No. A Article 122961
The paper presents a study of the behavior of room-temperature ionic liquids with different alkyl chain lengths and anion types in slit negatively charged carbon nanopores of various widths (1÷15 nm) using all-atom molecular dynamics simulations. The structure of the confined ionic liquids is investigated using number, mass, and charge density profiles and radial distribution ...
Added: August 31, 2023
Budkov Y., М. : ЛЕНАНД, 2020
Within the presented monograph for the first time statistical approaches, based on the self-consistent field theory, were presented for the theoretical description of the thermodynamic properties of the ion-molecular systems (electrolyte solutions, ionic liquids, dielectric polymers and metal-organic frameworks) in the bulk solution and at the interfaces with the account for their molecular structure. In ...
Added: November 18, 2019
Ефимова А. А., Mendeleev Communications 2023 Vol. 33 P. 1-4
Small anionic liposomes were electrostatically adsorbed on the surface of larger cationic liposomes thus forming multicompartment complexes composed exclusively of natural and synthetic lipids. The complexes contained two dozen anionic liposomes per a single cationic liposome and showed low cytotoxicity and ability to enzyme-induced biodegradation.The liposomal multi-compartment complexes demonstrate great application potential as containers for ...
Added: January 23, 2023
Yurova P., Tabachkova N., Stenina I. et al., Journal of Nanoparticle Research 2020 Vol. 22 P. 318
The effect of the precursor and surface modification by sulfate and phosphate groups on the properties of cerium oxide was studied. The obtained materials were characterized by infrared (IR) and Raman spectroscopy, X-ray powder diffraction, scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM), thermogravimetric analysis (TGA) with the gas phase composition analysis, Brunauer–Emmett–Teller (BET) ...
Added: November 29, 2020
Lototskyy M., Davids M. W., Sekgobela T. K. et al., Inorganics 2023 Vol. 11 No. 8 Article 319
Hydrolysis of light metals and hydrides can potentially be used for the generation of hydrogen on-board fuel cell vehicles, or, alternatively, for refilling their fuel tanks with H2 generated and pressurised without compressor on site, at near-ambient conditions. Implementation of this approach requires solution of several problems, including the possibility of controlling H2 release and ...
Added: August 11, 2023
Zhussupbekov K., Walshe K., Walls B. et al., Journal of Physical Chemistry C 2021 Vol. 125, No. 10 P. 5549-5558
Defects introduced to the surface of Bi(111) break the translational symmetry and modify the surface states locally. We present a theoretical and experimental study of the 2D defects on the surface of Bi(111) and the states that they induce. Bi crystals cleaved in ultrahigh vacuum (UHV) at low temperature (110 K) and the resulting ion-etched ...
Added: December 5, 2021
Yurova P., Караванова Ю. А., Yaroslavtsev A. B., Журнал неорганической химии 2015 Т. 60 № 11 С. 1551-1553
The properties of hybrid materials based on the MK-40 heterogeneous membrane, the MF-4SK homogeneous membrane, and zirconium oxide with a functionalized surface are studied. The ionic conductivity and diffusion parameters of these materials were studied. The presence of the asymmetry effect of diffusion permeability and mutual diffusion of HCl and NaCl solutions through the studied ...
Added: November 13, 2019
Dmitri Zagorskiy, Ilia Doludenko, Zhigalina O. et al., Membranes 2022 Vol. 12 No. 2 Article 195
The processes of formation of one-dimensional nanostructures by the method of matrix
synthesis was studied in this work. Nanowires (NWs) from magnetic metals of iron-group and
copper (3-d metals) were synthesized in the pores of matrix-track membranes by galvanic deposition.
NWs with both homogeneous elemental distribution (alloys) and with periodically alternating parts
with different composition (layers) were obtained in ...
Added: December 5, 2023