V. G. Ilyin

Adsorption of nitrogen, hydrogen, methane, and carbon oxides on micro- and mesoporous molecular sieves of different nature

A comparative study was carried out on the adsorption of H2, N2, CH4, CO, and CO2 at 77-273 K (p ≤ 1 atm) by silicate and phosphate zeolites and carbon materials, varying in size, shape, volume, and distribution of the micro- and mesopores. We studied effects of the porosity parameters and nature of the surface on gas absorption, in particular, the increased selectivity related to restrictions in the zeolite micropores, the presence of the cationic and acid protic sites as well as decreasing size of the micropores in the carbon adsorbents. The greatest separation of the methane-containing gas mixtures was found for zeolites with MFI channel structures. The greatest separation of the hydrogen-containing mixtures was found for cavity-type LTA, FAU, and CHA zeolites.

Preparation, Physicochemical Properties and Functional Characteristics of Micromesoporous Zeolite Materials

Information in the literature on methods of preparation, structure, adsorption properties, and physicochemical characteristics of micromesoporous zeolite materials, including hierarchical porosity, has been summarized and analyzed. Special features were noted and promise was indicated for the use of mesoporous zeolites in catalysis, adsorption, and matrices for new micromesoporous materials. Possible directions for further investigation of the physical chemistry of zeolites and micromesoporous zeolite materials were examined.

Structure and Porosity of Silicon Carbide Produced by Matrix Method

Silicon carbide in the β

Adsorption Properties of Porous Materials Based on Macrocyclic Nickel(II) Complexes and Benzenetricarboxylate Relative to Water, Methanol, and Hexane Vapor

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PHOTOCATALYTIC AND PHOTOELECTROCHEMICAL CHARACTERISTICS OF MESOPOROUS TITANIUM DIOXIDE MICROSPHERES

modification with a developed surface and a large pore size was obtained by carbothermal reduction using mesoporous siliceous molecular sieves (SBA-15, KIT-6, MCF, SBA-3). The formation of silicon carbide with high porosity parameters is favored by the use of the KIT-6 mesoporous molecular sieve (MMS) with a three-dimensional structure and a mutually intersecting system of mesopores as matrix, by the close to the stoichiometric C/SiO2 ratio, and also by the higher level of filling with carbon in the pores of the siliceous MMS.

Effect of Preparation Conditions on Formation and Features of Micro/Mesoporous Composite Materials on Base of Zeolites MCM-22, ZSM-5, and Beta

We have used a dual template synthesis method based on an initial ZSM-5 zeolite sol precursor in the presence of molecular and micellar templates to obtain X-ray amorphous and zeolite-containing microporous/mesoporous aluminosilicates having an ordered MCM-41 mesostructure, extended mesoporosity, small micropore volume, and medium-strength acid sites. We note a deviation from additivity for the change in micropore volume and the concentration of acid sites in the synthesized zeolitized samples.

Effect of the Structure and Acidity of Micro-Mesoporous Alumosilicates on Their Catalytic Activity in Cumene Cracking

We have shown that varying the substituents in the cationic component of porous crystal compounds formed by azamacrocyclic nickel(II) complexes and the 1,3,5-benzenetricarboxylate anion has a substantial effect on their adsorption behavior relative to water, methane, and n-hexane vapor. The studied compounds are characterized by reversibility of the changes in the crystal lattices during adsorption/desorption, stoichiometry of the reaction with water vapor with relatively low and hydrolytic stability at high humidity.

Facile synthesis of catalytically active porous titanosilicates for liquid-phase epoxidation of allyl alcohol with hydrogen peroxide

Partly zeolitized micro-mesoporous aluminosilicates SBA-15/ZSM-5 were synthesized by conversion of dry gel of template-containing SBA-15 in the presence of tetrapropylammonium hydroxide. They have a hexagonally ordered mesostructure and developed surface and mesoporosity for which the concentration and strength of the Brønsted and Lewis acid sites are higher than in AlSi-SBA-15. The formation of Brønsted acid sites of moderate strength in the samples with a low degree of zeolitization is due to the presence of ZSM-5 precursors as well as crystallites in the obtained aluminosilicates.