Department of sorption studies

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  • Development of scientific foundations and technologies for synthesis of new composite materials, sorbents and catalysts.
  • Determination of specific surface area and porous structure of catalysts and sorbents using gas absorption method.
  • Investigation of solid materials using non-isothermal kinetic methods (temperature-programmed desorption, temperature-programmed oxidation, temperature-programmed reduction, temperature-programmed reaction).
  • Investigation of sorption characteristics of catalysts and sorbents.
  • Investigation of interrelation between kinetic properties, in particular, transmition mobility of the adsorbed molecules, with the adsorption mechanism of molecules of polar and nonpolar substances and their mixes; a theoretical proof and practical realization of a method for synthesis of new generation of adsorbents, including block and film ones using polymeric templates

The head of the department: Grigory V. Mamontov

Employees of department: Grigory V. Mamontov, Valery V.Dutov, Natalia I. Kosova

The major goals of the department are to investigate sorption characteristics of porous materials (specific surface, specific surface of micropores, porosity, pore size distribution, acid-base properties, active sites, dispersion of supported metals, etc.), work off the processes for synthesis of functional materials.

The major activities of the department

Investigation of acid-base properties of catalysts and sorbents

Investigation of acid properties of surfaces by ammonia thermal desorption (TPD NH3), investigation of the basic properties by СО2 thermal desorption (TPD CO2), determination of the amount of acidic and basic sites, estimation of the nature and force of the sites. The works are carried out using chemosorption analyzers “ChemiSorb 2750” and “AutoChem HP” (Micromeritics).
Determination of specific surface and pore size distribution in porous materials
Measurements of specific surface, porosity and pore size distribution of lab-scale and industrial batches of catalysts and other functional materials are carried out. Measurements of specific surface are carried out using multipoint BET method by low-temperature nitrogen adsorption over TriStar 3020 (Micromeritics). Microporosity estimation is carried our using T-plot method, pore size distribution is determined by BJH-Desorption (1.7−200 nm).
Synthesis of porous silicate and silicate-phosphate materials with the given porosity characteristics
Strong and thermostable silicate and silicate-phosphate supports with the given porosity characteristics are developed to be used in synthesis of catalysts for selective and total oxidation. Sol-gel synthesis of silicagel and silicate-phosphates is conducted. The conditions of synthesis and subsequent hydrothermal processing or recondensation in the presence of phosphoric acid are optimized to create the given pore size distribution. The durability and functional properties of the material surface are also controlled.

Investigation of the mechanism of active site organization in catalytic systems using non-isothermal kinetic methods

New approaches to design of active surface of Ag-containing catalytic systems are developed to create highly effective catalysts for total and partial oxidation processes. Development of original experimental techniques is carried out. Investigation of the active sites of catalysts of various nature and various processes is conducted.
Silver-containing catalysts are developed for such processes as:

  • CO low-temperature oxidation;
  • ethanol oxidation to acetaldehyde;
  • total oxidation of formaldehyde in off-gases of chemical plants;
  • liquid phase oxidation of glyoxal to glyoxalic acid;
  • ethylene glycol oxidation to glyoxal;
  • ethylene glycol oxidation to glycolaldehyde;
  • propylene glycol oxidation to methylglyoxal.

The organization of active surface of catalytic systems for total and partial oxidation reactions, the nature and reactivity of the active sites are studied using the methods of temperature-programmed reaction (desorption, oxidation, reduction, reaction) as well as pulse kinetics methods.

Teamwork with department of catalysis is carried out.

The study course is developed for six-year students of the chemical department. The research results are reported at various conferences.