United Research and Development Center

Moscow, Russia

United Research and Development Center

Moscow, Russia
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Demidov D.V.,United Research and Development Center | Mishin I.V.,RAS N. D. Zelinsky Institute of Organic Chemistry | Mikhailov M.N.,RAS N. D. Zelinsky Institute of Organic Chemistry
International Journal of Hydrogen Energy | Year: 2011

Gibbs free energy minimization was applied to study thermodynamic equilibrium of the combined steam and carbon dioxide reforming of methane. Coke deposition, the content of methane and carbon dioxide in syn-gas as well as H2/CO ratio were investigated as a function of CO2/CH 4 and H2O/CH4 mole ratios at different temperatures and pressures. The ranges of the molar ratios CH 4/CO2/H2O in the feed with H2/CO = 2.1-2.2 were identified at which reforming of methane is not complicated by coke deposition. For each range optimized CH4/CO2/H 2O molar ratios characterized by the lowest content of methane and carbon dioxide in syn-gas were found. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.


Mamonov N.A.,United Research and Development Center | Fadeeva E.V.,RAS N. D. Zelinsky Institute of Organic Chemistry | Grigoriev D.A.,United Research and Development Center | Mikhailov M.N.,RAS N. D. Zelinsky Institute of Organic Chemistry | And 2 more authors.
Russian Chemical Reviews | Year: 2013

Results of studying methane dehydroaromatiza- tion over metal/zeolite catalysts have been reviewed. Special attention has focused on molybdenum catalysts based on HZSM-5 zeolites. The effect of catalyst synthesis and reaction conditions on the catalytic properties of the sys- tems has been scrutinized. Information on the mechanism of the process and the nature of active sites has been reported. The bibliography includes 137 references. © 2013 Russian Academy of Sciences and Turpion Ltd.


Alkhimov S.A.,United Research and Development Center | Grigor'Ev D.A.,United Research and Development Center | Mikhailov M.N.,RAS N. D. Zelinsky Institute of Organic Chemistry
Russian Chemical Bulletin | Year: 2013

The temperature-programmed reduction, powder X-ray diffraction, and oxygen titration were applied to study reducibility, phase composition, and structure of the active surface of the hybrid metal-zeolite catalysts Mβ@Co/Al 2O3 (M = Pd, Co, and Fe). The results of physicochemical studies were compared with the data on activity and selectivity of the catalysts in the synthesis of liquid hydrocarbons from the synthesis gas. The nature of transition metal and the method of its introduction into the catalyst influence the composition of synthetic liquid hydrocarbons. A comparison of the Feβ@Co/Al2O3 catalyst prepared by the ion-exchange method that exhibits the highest activity in the synthesis of liquid hydrocarbons with a similar catalyst Fe/(Hβ@Co/Al2O3) prepared by the impregnation method indicated a distinct advantage of the ion exchange procedure. A mechanism of isomerization and cracking of primary linear alkanes on the M n δ+ clusters in the Mβ@Co/Al2O3 systems was proposed. The mechanism explains the main features governing the group and fractional composition of the obtained synthetic hydrocarbons. © 2013 Springer Science+Business Media New York.


Mamonov N.A.,United Research and Development Center | Kustov L.M.,RAS N. D. Zelinsky Institute of Organic Chemistry | Alkhimov S.A.,United Research and Development Center | Mikhailov M.N.,RAS N. D. Zelinsky Institute of Organic Chemistry
Catalysis in Industry | Year: 2013

A one-dimensional heterogeneous model has been developed for a cat6alytic fixed-bed Fischer- Tropsch (FT) synthesis reactor in the isothermal granules approximation. The FT process has been simulated for a laboratory-scale reactor. The effects of the linear gas velocity and of the inner diameter of the reactor on the thermal stability of the process are considered. The size of the reactor is limited by the possibility of a thermal explosion occurring in the frontal layer of the catalyst. Raising the linear gas velocity enhances heat transfer, thereby reducing the overheating of the catalyst bed. The synthesis of solid hydrocarbons can be con- ducted in reactors no larger than 18 mm in diameter. According to calculations, the maximum temperature drop in a 3-, 4-, and 6-m-long reactor is 4.7, 4.2, and 3.6°C, respectively. The corresponding CO conversion is 35.0, 34.4, and 33.9%, respectively. For producing liquid hydrocarbons in a high-performance reactor, it is necessary to decrease its inner diameter to 12 mm. In this case, the maximum temperature drop at a reactor length of 3, 4, and 6 m is 9.6, 8.7, and 7.6°C, and the CO conversion is 78.0, 77.4, and 76.7%, respectively. The mathematical model devised here provides means to estimate the necessary design parameters of the reactor and the appropriate FT synthesis conditions for producing liquid or solid hydrocarbons. © Pleiades Publishing, Ltd., 2013.


Protasov O.N.,United Research and Development Center | Mamonov N.A.,United Research and Development Center | Mikhailov M.N.,RAS Institute of Organic Chemistry | Kustov L.M.,RAS Institute of Organic Chemistry
Russian Journal of Physical Chemistry A | Year: 2012

The thermodynamic equilibrium in the carbon dioxide conversion of methane is studied by Gibbs energy minimization. The curves that represent the dependences of the degree of coke formation, the content of methane and carbon dioxide in syngas, and the syngas module on the CO 2/CH 4 mole ratio in the initial mixture and on temperature at various pressures, are plotted. The regions in which the CO 2/CH 4 mole ratio is optimal for carbon dioxide conversion and no coke formation occurs, and which are characterized by a minimal content of methane and carbon dioxide in syngas, are revealed © Pleiades Publishing, Ltd., 2012.


Gerasimov D.N.,United Research and Development Center | Fadeev V.V.,United Research and Development Center | Loginova A.N.,United Research and Development Center | Lysenko S.V.,United Research and Development Center
Catalysis in Industry | Year: 2013

Granular Pt/(ZSM-23-γ-Al2O3) catalysts with different platinum and zeolite contents have been synthesized with the aim of developing efficient isodewaxing catalysts for lowering the pour point of lubricants and diesel fuels. Their physicochemical properties have been studied by X-ray diffraction, temperature-programmed desorption of ammonia, and low-temperature nitrogen adsorption/desorption. The effects of catalyst composition and process conditions (1.0-3.0 MPa, 220-400 C) on the outcomes of the isodewaxing of the 280 C-EBP lubricant fraction isolated from the hydrocracking product of vacuum gas oil have been investigated. The highest yields of products with the same pour points have been obtained with a 0.30 wt % platinum catalyst supported on the 20 wt % zeolite ZSM-23 + 80 wt % γ-Al2O3 material. An analysis of the basic performance characteristics of the isodewaxing catalysts based on zeolite ZSM-23 and dewaxing catalysts based on zeolite ZSM-5 has demonstrated that the catalysts based on ZSM-23 ensure higher yields of dew-axed products than the laboratory and commercial catalysts based on ZSM-5. © 2013 Pleiades Publishing, Ltd.


Soin A.V.,RAS Vernadsky Institute of Geochemistry and Analytical Chemistry | Maryutina T.A.,RAS Vernadsky Institute of Geochemistry and Analytical Chemistry | Arbuzova T.V.,United Research and Development Center | Spivakov B.Ya.,RAS Vernadsky Institute of Geochemistry and Analytical Chemistry
Journal of Analytical Chemistry | Year: 2010

Comparative elemental analysis of the Tengiz oil and diesel fuel is performed by inductively coupled plasma mass-spectrometry with autoclave digestion, digestion, dilution with organic solvents, and also rotating coiled columns (RCCs). The advantages and drawbacks of each of the listed sample preparation techniques for the separation of microelements are discussed. In contrast to the other versions, the use of RCCs is shown to provide a unique opportunity to preconcentrating microelements from oil and petroleum products into tiny volumes of aqueous solutions (10 mL of 0.5 M HNO3). The eluate prepared can be used in the subsequent analysis by ICP MS with no extra sample preparation steps. The RCC preconcentration of elements from oil and petroleum products makes it possible to determine metals in concentrations from μg/kg to ng/kg. © 2010 Pleiades Publishing, Ltd.


Gerasimov D.N.,United Research and Development Center | Fadeev V.V.,United Research and Development Center | Loginova A.N.,United Research and Development Center | Lysenko S.V.,United Research and Development Center
Catalysis in Industry | Year: 2015

A review of the literature on the catalysts of hydroisomerization of long-chain paraffins is presented. Part I describes the mechanisms of paraffin hydroisomerizations and presents an analysis of data on the catalysts of hydroisomerization based on zeolites of various types. Part II is devoted to catalysts based on structured mesoporous materials, partially reduced molybdenum oxides and oxycarbides, and mixtures of tungsten and zirconium oxides. Industrial catalysts that have found use in isodewaxing of diesel fuels and oils are described. © 2015 Pleiades Publishing, Ltd.


Grigoryeva D.A.,United Research and Development Center | Mikhailov M.N.,RAS N. D. Zelinsky Institute of Organic Chemistry
Russian Chemical Bulletin | Year: 2011

The temperature-programmed reduction, powder X-ray diffraction, and oxygen adsorption methods were applied to study the phase composition and the nature of the active surface of the catalyst Co(10%)/ZrO 2. The results of the physicochemical studies were compared with the data on the activity and selectivity of the catalysts in the synthesis of hydrocarbons from CO and H 2. The mechanism for the reduction of the cobalt phases in the Co(10%)/ZrO 2 system was proposed. The main features governing the formation of active sites of the synthesis of high-molecular-weight hydrocarbons were considered. © 2011 Springer Science+Business Media, Inc.


Mikhailov M.N.,RAS Institute of Organic Chemistry | Demidov D.V.,United Research and Development Center | Loginova A.N.,United Research and Development Center | Kustov L.M.,RAS Institute of Organic Chemistry
Russian Journal of Physical Chemistry A | Year: 2011

The thermodynamic equilibrium for the steam-carbon dioxide conversion of methane was studied by Gibbs energy minimization. The degree of coke formation, the content of methane and carbon dioxide in the synthesis gas, and the synthesis gas H2/CO ratio were plotted as functions of the molar ratios of CO2/CH4 and H2O/CH4 in the initial mixture at different temperatures and pressures. The regions of the optimum CH4/CO2/H2O molar ratios for steam-carbon dioxide conversion were discovered, with no coke formation taking place in these regions. The optimized CH4/CO2/H 2O molar fractions characterized by the minimum content of methane and carbon dioxide in the synthesis gas were found for each region. © 2011 Pleiades Publishing, Ltd.

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