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174 Result(s)
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Article
EXPERIMENTAL AND COMPUTATIONAL STUDY OF THE STRUCTURE AND BONDING INTERACTIONS IN LAYERED COMPOUNDS OF MOLYBDENUM DISULFIDE WITH GUANIDINE DERIVATIVES
Heterolayer MoS2 compounds with molecules of protonated guanidine (GUA) and its aliphatic derivative 1,5,7- triazobicyclo[4.4.0]dec-5-ene (TABD) are prepared using single-layer dispersion of molybdenum disulfide....
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Article
Synthesis of Zn Aluminosilicates and Their Physicochemical and Catalytic Properties in the Aromatization of Propane
Zn aluminosilicates of a ZSM-5 zeolite structural type are synthesized from alkaline alumino-silica gels via hydrothermal crystallization. Structural and morphological data on the samples show that incorporati...
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ACTIVATION OF Au–CeO2 COMPOSITES PREPARED BY PULSED LASER ABLATION IN THE REACTION OF LOW-TEMPERATURE CO OXIDATION
The Au/CeO2 composite catalyst is prepared by pulsed laser ablation in liquid (PLAL). Dispersions of gold and cerium are prepared in alcohol and water, respectively, mixed, dried, and annealed at various temperat...
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Article
A COMPARATIVE STUDY OF THE DEPOSITION OF NANOSCALE Au–S INTERMEDIATES FROM AQUEOUS SOLUTIONS ON CuO, TiO2, AND α-Fe2O3 SURFACES
Products of the interaction between dispersed copper(II), iron(III) (hematite), and titanium(IV) (rutile) oxides and aqueous solutions containing liquid prenucleation intermediates formed in the reaction of HAuCl
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Article
Structure and Noncovalent Interactions of Molybdenum Disulfide Monolayers in the Layered Organo-inorganic Compound with Tetramethylguanidine
A layered compound with regularly alternating monolayers of MoS2 and N,N,N',N'-tetramethylguanidine (TMG) is synthesized by the reaction of monolayer dispersions of molybdenum disulfide containing anionic particl...
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Article
Influence of the Ag Content on the Activity of Ag/CeO2 Catalysts in the Reduction of 4-Nitrophenol at Room Temperature and Atmospheric Pressure
Functionalized aromatic amines are an important basis for the production of pharmaceuticals, agrochemicals, polymers, dyes, and other industrially significant products. The catalytic reduction of nitroarenes t...
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Article
Influence of Conditions of Cryogenic Molybdenite Grinding on the Activity of Bulk Sulfide Hydrotreating Catalysts
The milling of molybdenite under cryogenic conditions in argon has been performed for the first time, and the physicochemical properties of its samples, their catalytic activity in model reactions of hydrodesu...
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Article
The effect of Ag and CeO2 distribution on SBA-15 surface on the activity of Ag–CeO2/SBA-15 catalysts in CO and methanol oxidation
The series of catalysts representing the mesoporous ordered silica SBA-15 with supported silver or silver and ceria nanoparticles were synthesized by incipient wetness impregnation, characterized by the low-te...
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Article
Influence of Preparation Method of Ag–CeO2 Catalysts on Their Structure and Activity in Soot Combustion
The exhaust gases from motor vehicles contain unburned soot particles that pollute the environment and have a detrimental effect on the human health. The solution to this problem requires the development of ne...
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Article
Dealumination of Nanosized Zeolites Y
The dealumination of nanosized zeolites is an important scientific problem, which should be solved to improve the activity of catalysts based on this zeolite in a broad range of heterogeneous catalytic reactio...
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Article
1H and 93Nb Solid-State NMR and IR Study of Acidity of Nanodisperse Nb2O5·nH2O
Niobium oxide hydrate is a promising material for various heterogeneous catalytic processes due to its strong acidity and stability in aqueous medium. While different synthesis conditions may lead to various p...
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Article
Nonoxidative Conversion of Methane to Aromatic Hydrocarbons in the Presence of ZSM-5 Zeolites Modified with Molybdenum and Rhenium
The nonoxidative conversion of methane to aromatic hydrocarbons in the presence of a high-silica ZSM-5 zeolite modified with molybdenum and rhenium nanopowders has been studied. Data on the acid characteristic...
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Article
Nature of the Active Centers of In-, Zr-, and Zn-Aluminosilicates of the ZSM-5 Zeolite Structural Type
In-, Zr-, and Zn- containing elementoaluminosilicates of ZSM-5 zeolite structural type are synthesized by means of hydrothermal crystallization from alkaline alumina–silica gels. Based on the data of structura...
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Article
Effect of the metal−support interaction in Ag/CeO2 catalysts on their activity in ethanol oxidation
The interaction of silver with the surface of CeO2 in the Ag/CeO2 catalysts prepared by coprecipitation and impregnation techniques was studied by temperature-programmed reduction, X-ray diffraction, and high-res...
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Article
Physicochemical and catalytic properties of Ga and In pentasils in the reaction of propane aromatization
Ga and In ZSM-5 zeolites are obtained via hydrothermal crystallization from alkali aluminosilicate gels. Their physicochemical and catalytic properties during conversion of propane into aromatic hydrocarbons a...
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Article
Synthesis of gold nanoparticles and thin films with the use of micellar solution of Brij 30
Gold nanoparticles (NPs) with the average core diameter d Au = 6.8 ± 1.6 nm have been synthesized in reverse micelles of the oxyethylated surfactant Brij 30. It has been shown that...
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Article
Deactivation features of gallium-containing zeolites in the propane aromatization process
Conversion of propane to aromatic hydrocarbons on Ga-containing zeolite catalysts prepared by various methods has been examined, and their comparative stability against deactivation has been analyzed. It has b...
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Article
Preparation method effect on the physicochemical and catalytic properties of a methane dehydroaromatization catalyst
The molybdenum precursor effect on the physicochemical properties of the Мо/ZSM-5 catalyst and on its catalytic properties in nonoxidative methane conversion into aromatic hydrocarbons has been investigated. T...
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Article
Study of the factors affecting the formation of copper–chromium/aluminum oxide compounds with a spinel structure
The effect of the Cr3+/Al3+ ratio on the crystallization temperature of mixed oxide compounds with a spinel structure and their structural features and morphological characteristics have been studied using a comb...
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Silica-containing inclusions in the cytoplasm of diatom Synedra acus
Cells of the araphid pennate diatom Synedra acus subsp. radians contain large inclusion (1–15 μm) storing silica, as revealed by transmission electron microscopy and EDX-analysis. The size of the inclusions incre...