A. P. Glotov

Nanoparticles Formed onto/into Halloysite Clay Tubules: Architectural Synthesis and Applications

Nanoparticles, being objects with high surface area are prone to agglomeration. Immobilization onto solid supports is a promising method to increase their stability and it allows for scalable industrial applications, such as metal nanoparticles adsorbed to mesoporous ceramic carriers. Tubular nanoclay - halloysite - can be an efficient solid support, enabling the fast and practical architectural (inside / outside) synthesis of stable metal nanoparticles. The obtained halloysite-nanoparticle composites can be employed as advanced catalysts, ion-conducting membrane modifiers, inorganic pigments, and optical markers for biomedical studies. Here, we discuss the possibilities to synthesize halloysite decorated with metal, metal chalcogenide, and carbon nanoparticles, and to use these materials in various fields, especially in catalysis and petroleum refinery.

Catalytic Cracking of Petroleum Feedstock in the Presence of Additives Derived from Cross–Linked Mesoporous Oxides for Reduction of the Sulfur Content in Liquid Products

Sulfurreducing La/MCM–41/γ–Al2O3 additives to a commercial zeolitecontaining cracking catalyst derived from MCM–41/γ–Al2O3 support with different ratios of the MCM–41 and γ–Al2O3 components were evaluated. Vacuum gas oil cracking at 500°C in the presence of these additives (10 wt. % additive in the catalyst) reduces sulfur in the liquid products by 20–31%.

Use of ionic liquids in cyclohexene epoxidation with hydrogen peroxide

A comparative study of the reaction of catalytic epoxidation of cyclohexene with hydrogen peroxide in water and ionic liquids containing dihydrogen phosphate anions, such as trimethylammonium dihydrogen phosphate, diethylammonium dihydrogen phosphate, and N-methylpyrrolidonium dihydrogen phosphate has been performed. It has been shown that as high a cyclohexane epoxide yield as 80% with a selectivity close to quantitative can be obtained under optimum conditions by controlling the ratio of the ionic liquid components.

Core-shell nanoarchitecture: Schiff-base assisted synthesis of ruthenium in clay nanotubes

Abstract Natural halloysite clay nanotubes were used as a template for clay/Ru core-shell nanostructure synthesis. Ru-nanoparticles were produced via a ligand-assisted metal ion intercalation technique. Schiff bases formed from different organic compounds proved to be effective ligands for the metal interfacial complexation which then was converted to Ru particles. This produces a high amount of intercalated metal nanoparticles in the tube’s interior with more that 90% of the sample loaded with noble metal. Depending on the selection of organic linkers, we filled the tube’s lumen with 2 or 3.5-nm diameter Ru particles, or even larger metal clusters. Produced nanocomposites are very efficient in reactions of hydrogenation of aromatic compounds, as tested for phenol and cresols hydrogenation.

Mathematical Modeling of the Catalytic Cracking of Oil Sludge that has Been Subjected to Electromagnetic Activation

This article presents experimental and theoretical data on the catalytic cracking of oil sludge mixed with vacuum gas oil with and without activation of the feedstock by electromagnetic radiation. Mathematical models of the catalytic cracking of oil sludge in the presence of aluminosilicate zeolite catalysts are constructed. It is demonstrated that preactivation of the feedstock enhances gasoline and diesel yield upon cracking. Cracking of activated feedstock occurs with a lower activation energy.

Hydrocracking of Vacuum Gas Oil on Bimetallic Ni-Mo Sulfide Catalysts Based on Mesoporous Aluminosilicate Al-HMS

The activity and selectivity of a bimetallic Ni-Mo sulfide catalyst based on mesoporous aluminosilicate Al-HMS with Si/Al ratio of 10 in the vacuum gas oil hydrocracking process in a reactor with a fixed catalyst bed was studied. The dependence of the activity and selectivity of the NiS-MoS2/Al-HMS (Si/Al = 10) catalyst on the process parameters (temperature, hydrogen pressure, volume stock feed rate, etc.) was investigated. It was shown that in the 380-450°C range at 5 MPa hydrogen pressure the catalyst ensures conversion of the heavy part of the hydrocarbon stock into fuel fractions with high selectivity in the middle distillates and makes it possible to reduce the sulfur content of the liquid hydrocracking products.

Hydrogenation of Aromatic Substrates over Dispersed Ni–Mo Sulfide Catalysts in System H2O/CO

The activity of unsupported Ni–Mo sulfide catalysts formed during the in situ decomposition of oil-soluble precursors (molybdenum hexacarbonyl, nickel naphthenate) in the hydrogenation of aromatic and naphthene-aromatic compounds is studied. The catalysts are characterized by HRTEM and XPS. Catalytic experiments are conducted at temperatures of 340–380°C and an increased pressure of ?? in the presence of water providing the in situ generation of hydrogen via the water-gas shift reaction. The catalysts exhibit a high activity in the hydrogenation of model substrates (methyl- and dimethyl-substituted naphthalenes and anthracene).

Bimetallic Sulfur-Reducing Additives Based on Al–MCM-41 Structured Aluminosilicate for Cracking Catalysts

An ordered mesoporous aluminosilicate of the Al–MCM-41 type has been studied as a component of additives for of petroleum feedstock cracking catalysts. The influence of the nature of the modifying material and its concentration on the activity of the additive has been investigated. It has been shown that the use of bimetallic additives on the basis of ordered mesoporous aluminosilicate makes it possible to reduce the sulfur content in liquid cracking products of vacuum gas oil by 37% more effectively in comparison with that for an additive-free industrial catalyst.

Study of the Oxidation Products of Light Oil Aromatic Compounds Using Ultrahigh Resolution Mass Spectrometry

The chemical composition of the oxidation products of aromatic compounds in oils is analyzed by Fourier transform ion-cyclotron mass spectrometry. Pyrene, phenanthrene derivatives, and naphthenonaphthalenes are shown to be oxidation-resistant aromatic components of oil. Ozoneoxidation products of homologs of benzene, naphthalene, and compounds having four or more aromatic rings are determined.

Correction to: Study of the Oxidation Products of Light Oil Aromatic Compounds Using Ultrahigh Resolution Mass Spectrometry

The acknowledgement on page 895 should readThis work was carried out with the financial state support of Russian Ministry of Education and Science (Specific Project Identifier RFMEF157717X0239; Contract No. 14.577.21.0239).