V. V. Lunin

Moscow State Textile University, Moskva, Moscow, Russia

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Publications (292)250.37 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Lipids are produced with a 60 wt % yield in terms of dry biomass in the course of fermentation of oleaginous fungi at 27-28A degrees C for 4-5 days. Triglycerides are extracted by supercritical carbon dioxide in a flow regime at 80-100A degrees C and 50 MPa. The fatty acid methyl esters (FAME) are synthesized via a two-step transesterification of triglycerides with a 98% yield. It is demonstrated using a combined method of chromatography-mass spectrometry that the fatty acid composition of the fungal lipids from Cunninghamella echinulata is close to that of rapeseed oil.
    Russian Journal of Physical Chemistry B 12/2015; 8(8):1004-1008. DOI:10.1134/S1990793114080028 · 0.34 Impact Factor
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    ABSTRACT: Nitrogen doped carbon nanoflakes, which are very important for many electrochemical applications, were synthesized by pyrolysis of nitrogen containing organic compounds over metal oxide template. Acetonitrile, pyridine and butylamine, which are of different volatility were tested as N-containing precursors. Morphology, structure and chemical composition of the as-synthesized materials were investigated by scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that materials are highly defective and consist of a few malformed graphene layers. X-ray photoelectron spectra reflect the dominant graphitic and pyridinic N-bonding configuration. It was also noted that specific surface area depends on the duration and temperature of the reaction. Increase in duration and temperature led to decrease of the specific surface area from 1000 to 160 m2/g, 1170 to 210 m2/g and 1180 to 480 m2/g for acetonitrile, butylamine and pyridine precursors, respectively.
    Materials Research Bulletin 09/2015; 69:7-12. DOI:10.1016/j.materresbull.2014.12.057 · 1.97 Impact Factor
  • Applied Biochemistry and Microbiology 05/2015; 51(3):350-354. DOI:10.1134/S0003683815030102 · 0.66 Impact Factor
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    ABSTRACT: The catalytic activity of a detonation nanodiamond and its Ni-containing forms in the conversion of 1,2-dichloroethane is studied and compared with the activity of other carbon and nanocarbon materials: carbon nanotubes, “Dalan” synthetic diamond, and fluorinated graphite. The surface and structure of the carbon materials are characterized using XRD, diffuse reflectance IR spectroscopy, XPS, BET, and TPR. The catalytic properties of the materials are studied using the pulsed microcatalytic method. It is found that the synthetic diamond, the nanodiamond, and its Ni-containing forms are catalysts for dichloroethane conversion in a nitrogen atmosphere, where the main product is ethylene. It is noted that the catalytic activity of deactivated diamond catalysts is restored after hydrogen treatment. It is shown that the carbon structure of the nanodiamond and the “Dalan” synthetic diamond with hydrogen groups located on it plays a key role in the dichloroethane conversion. It is found that the nanodiamond acts simultaneously as a catalyst and an adsorbent of chlorine-containing products of dichloroethane conversion.
    Russian Journal of Physical Chemistry 04/2015; 89(4). DOI:10.1134/S0036024415040251 · 0.49 Impact Factor
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    ABSTRACT: The transformations of glucose over the Pt/C catalyst in a flow reactor in the temperature range 140-200°C at a pressure of 5.0 MPa have been studied. The main routes of glucose conversion in an aqueous phase in the presence of hydrogen, helium, or air have been considered. A product formation scheme depending on the reaction parameters has been proposed. At 140°C, glucose hydrogenation into sorbitol occurs with a selectivity of 77%. In an oxidizing atmosphere, glucose transforms into gluconic acid (with 73% selectivity at 140°C); here, the formation of sorbitol and mannitol (with a selectivity of 5-7% at 180-200°C) is also possible. Glucose transformation by-products, such as C3-C5 polyatomic alcohols, ketones, acids, and furfural derivatives, have been identified. The degree of glucose reforming in the aqueous solution with the formation of the gaseous products H2 and CO2 is no higher than 10% at 200°C.
    Kinetics and Catalysis 01/2015; 56(1):84-88. DOI:10.1134/S0023158415010073 · 0.67 Impact Factor
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    ABSTRACT: The interaction between ozone and mono-, di-, and trichloroacetic acids are studied using a flow vacuum gas discharge setup in a regime close to stratospheric conditions (in the temperature range of 77 to 250 K, at pressures of 10−3 to 0 Torr, and in the presence of ice). The interaction between ozone and trichloroacetic acid starts at 77 K, while interaction with monochloroacetic acid begins when the temperature is raised to 200 K. The reactions are assumed to proceed via different mechanisms: chlorine oxides of different composition are the reaction products, as is shown using low-temperature IR spectroscopy. Preliminary adsorption of the acids on a surface of ice raises the temperature of interaction to 190 K.
    Russian Journal of Physical Chemistry 01/2015; 89(1). DOI:10.1134/S0036024415010264 · 0.49 Impact Factor
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    ABSTRACT: Experiments on absorption of TmCl3 and Tm(NO3)3 from dry acetonitrile and aqueous solutions, respectively, were performed using carboxylated multiwalled carbon nanotubes with conic and cylindrical displacement of graphene layers. Using HAADF TEM imaging and EDX spectroscopy it was found that in the first case the chemisorption with complex compound formation with oxygen from carboxylated MWCNTs takes place while in the later this process is hampered by kinetic factor and side reactions with water. The data obtained are in good agreement with results of thermal-mass spectral and elemental CHNSO analysis. This particularity allows using transmission electron microscopy and related techniques for direct surveying of light atoms-containing groups on the surface of carbon materials. In the case of carboxylated cylindrical and conic MWCNTs it demonstrate that nanotubes in the second case are uniformly covered by functional groups while in the first – near the ends of tubes and the local defects along the surface.
    Procedia Engineering 12/2014; 93. DOI:10.1016/j.proeng.2013.11.038
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    ABSTRACT: A mechanism and kinetic model for the synthesis of peroxide radical condensate via the low-temperature interaction of hydrogen atoms with O2 molecules is proposed. The main components of the reaction, hydrogen tetroxide H2O4 and hydrogen peroxide H2O2, are formed in a low-temperature liquid layer formed near the cold surface during synthesis. Molecules of H2O4 and H2O2 are stabilized by transitioning to the solid phase. The dependences of the \(N_{O_2 } /N_{H_2 O_2 }\) ratio on the ratio of concentrations of H and O2 in the gas phase, calculated on the basis of the model, are consistent with the experimental data.
    Russian Journal of Physical Chemistry 09/2014; 88(9). DOI:10.1134/S0036024414090222 · 0.49 Impact Factor
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    ABSTRACT: Heterometallic compounds of general formula [Fe 2 III MIIO(O2CR)6(H2O)3] · 3H2O (R = CH3, M = Co, Ni; R = CCl3, M = Co, Ni) have been studied by XPS. The compounds have been identified as high-spin complexes with metal atoms in oxidation states M(II) and M(III). Analysis of the XPS data revealed the tendency of the XPS pattern and magnetic parameters of molecules to change with a change in the electronic nature of metal atoms. The assignment is based on the degree of covalence of the M-O bond. In chloro-substituted heterocomplexes, electron density delocalization on the metal atoms with metal-to-ligand charge transfer through three bonds (M-O-C-C) is observed. The substitution in terminal groups leads to the change in the electron density distribution between the carboxylate and terminal groups.
    Russian Journal of Inorganic Chemistry 07/2014; 59(7):670-677. DOI:10.1134/S0036023614070067 · 0.55 Impact Factor
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    ABSTRACT: During cultivation of the filamentous fungus Lentinus tigrinus on a medium containing lignin, a high oxygen content stimulated the growth of the fungus and contributed to the yield of lipids. A high content of phosphatidic acid and a reduction in the level of phosphatidylethanolamine and phosphatidylserine were first detected in the composition of phospholipids. Changes in the composition of neutral lipids, such as variation in the ratio of esterified and free sterols, have occurred; thus, the amount of sterol esters reduced simultaneously with a decrease in the content of free fatty acids. Based on the obtained results, the possible role of phosphatidic acid as a second messenger in the process of the consumption of lignin by the fungus Lentinus tigrinus is discussed.
    Prikladnaia biokhimiia i mikrobiologiia 05/2014; 50(3):318-323. DOI:10.7868/S0555109914030246
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    ABSTRACT: Nickel-containing metal-carbon nanocomposites (Ni@C) synthesized by levitation melting in a flow of an inert gas-hydrocarbon mixture were used as catalysts of the hydrogenation of phenylacetylene (PA). The nanocomposites were characterized by X-ray photoelectron spectroscopy, simultaneous thermal analysis, and temperature-programmed reduction. The nickel-carbon nanocomposites were stable on storage in air, with only 13% of the total amount of nickel oxidized after 3.5 years of storage. In addition to nanoparticles completely covered with carbon, the composites contained partially coated metal particles, which are readily oxidized in air. Both types of particles exhibited the catalytic activity in phenylacetylene hydrogenation. At higher contents of nickel partially coated with carbon, the activity increased and the selectivity of styrene formation decreased. The minimum half-conversion temperature (75°C) was determined for a specially prepared Ni@C sample with an increased content of oxidized nickel (28%). The maximum selectivity of styrene formation (∼75% at 150°C) was recorded in the presence of the sample with the smallest amount of oxidized nickel (less than 4%).
    Russian Journal of Physical Chemistry 01/2014; 88(1). DOI:10.1134/S0036024414010099 · 0.49 Impact Factor
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    ABSTRACT: A method of separation of a mixture of three methoxy derivatives of psoralen—bergapten, xanthotoxin, and isopimpinellin—has been developed. The performed screening allows it to be concluded that it is appropriate to separate them by normal-phase supercritical-fluid chromatography (SCF). Analysis of mechanisms of separation of methoxypsoralens (MOPs) showed that, on all silica gel-based sorbents with immobilized polar groups, except for 2-ethylpyridine and pentafluorophenyl sorbents, absorption occurs by the same retention mechanism. A possible explanation for the observed regularities of elution of the related MOPs has been suggested. In the case of pentafluorphenyl sorbent, π-electronic intermolecular interactions play a key role in separation. Presumably the same effect is responsible for the particular order of elution observed when the 2-ethypyridine sorbent was used.
    Russian Journal of Physical Chemistry B 12/2013; 7(8). DOI:10.1134/S1990793113080083 · 0.34 Impact Factor
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    ABSTRACT: Thermodynamic aspects of an innovative binary-mixture (BM) technology for increasing the productivity of oil-bearing beds that provides a substantial reduction of oil-well watering (compared to conventional steam heating) are discussed. Inorganic and organic ammonium nitrates (NH4NO3 and HOCH2NH 3+ NO 3- respectively) are compared qua heat-producing components of a BM that also contains sodium nitrite as an initiator of nitrate decomposition. Effects of temperature and pressure on the product distribution and heat production in ethanolammonium nitrate decomposition are evaluated. Calculations of parameters in a near-well space taking into account the heat capacity of the surrounding rock layer show that temperature and pressure can exceed their critical values for both water and main oil fractions. As a result, conditions for an intense upward flow of water—oil fluid in an artificial gas-lift regime arise.
    Russian Journal of Physical Chemistry B 12/2013; 7(7). DOI:10.1134/S1990793113070026 · 0.34 Impact Factor
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    ABSTRACT: The concentration of one-electron transfer sites on the surface of H-ZSM-5, H-Y, H-mordenite, and H-β zeolites was measured by EPR using 9,10-antrhraquinone as a probe. It has been found that the hyperfine structure from four protons typical for one-centered complexes of anthraquinone with one acidic site was observed in the EPR spectra after anthraquinone interaction with a zeolite surface in the temperature range of 373 to 423 K. It has been established that an elevated temperature of 473 K promoted the decomposition of the adsorbed anthraquinone and the disappearance of the hyperfine structure. It has been shown that the thermal instability of anthraquinone adsorbed on zeolites changed in the series H-β > H-Y > H-ZSM-5 ∼ H-mordenite; the coke-forming ability of zeolites with regard to n-decane at 443 K changed in a similar manner. It has been established that the presence of air promoted coke-forming processes upon interaction between n-decane and zeolites.
    Russian Journal of Physical Chemistry 12/2013; 87(12). DOI:10.1134/S003602441312008X · 0.49 Impact Factor
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    ABSTRACT: The reaction of complete methane oxidation over deposited catalysts (NiO/ZrO2 and NiO/YSZ) and binary oxides NiO_ZrO2 produced by co-precipitation, by the sol gel method, and using a bio-template (NiO content in the samples, 10.1 mol %) is investigated. It is shown that binary oxides cause methane oxidation at lower temperatures than their deposited analogue: the temperature of methane half-transformation is 470, 500, and 520°C for binary oxides, while T 50 = 570°C for NiO/ZrO2. Major factors affecting the activity of binary oxides in the methane oxidation reaction are determined: the dispersion of the active phase (NiO) and the availability of the second component with high mobility of the lattice oxygen.
    Russian Journal of Physical Chemistry 11/2013; 87(11). DOI:10.1134/S0036024413110162 · 0.49 Impact Factor
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    ABSTRACT: The results from a comparative study of the thermal denaturation of collagen in the venous walls of reference samples and samples with varicose disease are presented. Changes in the organization of collagen network of the tissue matrix are detected via thermal analysis and multiphoton microscopy with recording of the second harmonic generation (SHG). It is established that the collagen network of venous walls degrades in varicose disease. It is shown that the disordering of the tertiary structure of collagen molecules is reflected in a 40% drop in the enthalpy of protein denaturation compared to reference (ΔH D = 12.4 ± 4.9 J/g dry residue). The disorganization of fiber structures is recorded on SHG images. It is shown that upon the hydrothermal heating of sequestered samples of venous walls, the complete degradation of the tissue network occurs at 75°C. However, it is noted that upon the mechanical immobilization of samples of both types, the stability of collagen increases and complete denaturation is observed at temperatures above 84°C. It is suggested that the number of available conformations of polypeptide chains in the random coil state falls under tension, lowering ΔS D and raising the temperature of the denaturation of protein.
    Russian Journal of Physical Chemistry 11/2013; 87(11). DOI:10.1134/S0036024413110101 · 0.49 Impact Factor
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    ABSTRACT: Bimetallic catalysts based a Co-Fe/carrier system are prepared via the consecutive and combined deposition of metals on Al2O3 and MgO · Al2O3. The dynamics of CO hydrogenation at 300°C is studied.
    Russian Journal of Physical Chemistry 10/2013; 87(10):1622-1626. DOI:10.1134/S0036024413100154 · 0.49 Impact Factor
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    ABSTRACT: Mass spectrum of negative ions of trichloroacetic acid (TCA) in aqueous solution was obtained by mass spectrographic method of electrolyte solution electrospray in vacuum (ESESv). The TCA reactivity was neutralized by potassium hydroxide. The mass spectrum of TCA consists of the acid residue ions, (CCl3COO)�, hydrated by different number of water molecules. The (CCl3COO)� ion hydrated by two water molecules has the maximum intensity. The ESESv method can be helpful for determination of the composition electrolyte solutions in ecological studies.
    Chemical Physics Letters 09/2013; 586:40-43. DOI:10.1016/j.cplett.2013.09.037 · 1.99 Impact Factor
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    ABSTRACT: Variants of the formation of weak intramolecular hydrogen bonds of C-H…O type in 8-methox-ypsoralene (8-MOP) were considered. Quantum-chemical calculations showed the possibility of an intramolecular hydrogen bond between the protons of the methoxy group and both (furan and pyrone) neighboring oxygen atoms of the psoralene system. The energy gain of this binding was detected by DFT, but not found by the Hartree-Fock method. The bond with pyrone oxygen is energetically more favorable, though the difference in energy between the two types of minima found on PES was small. This interaction had earlier been recorded for linear 8-substituted furocoumarins other than 8-MOP. The conclusion was drawn that the calculated energy barriers on the PES of methoxy group rotation were small enough (2.5 kcal/mol in the Hartree-Fock method, 1.1 kcal/mol in PBE, and 0.9 kcal/mol in B3LYP) to state that the methoxy group rotates freely, creating a steric hindrance for two close-lying oxygens of the psoralene structure, which are not involved in lone electron pair-π system interactions.
    Russian Journal of Physical Chemistry 09/2013; 87(9):1542-1544. DOI:10.1134/S0036024413080177 · 0.49 Impact Factor
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    ABSTRACT: Role of small and big gold particles in CO oxidation and methanol selective oxidation to formaldehyde has been studied by the methods of diffuse reflectance electron spectroscopy, XRD, XPS, HRTEM and catalytic testing. By comparison of catalytic and spectroscopic data it was concluded that states Auδ+ with certain effective charge (δ < 1) are active sites in low-temperature CO oxidation as well as in alcohol partial oxidation. These states can be formed under the action of different factors, such as metal–support interaction, redox treatments, and modifying additives. Modifiers stabilizing the ionic states of gold (Ce and Zr oxides) increase the selectivity of the catalyst in alcohol partial oxidation, whereas electron-releasing additions (La and Cs oxides) impair the catalyst properties.
    Fuel 08/2013; 110:48–53. DOI:10.1016/j.fuel.2012.10.012 · 3.41 Impact Factor

Publication Stats

1k Citations
250.37 Total Impact Points

Institutions

  • 2015
    • Moscow State Textile University
      Moskva, Moscow, Russia
  • 1980–2015
    • Lomonosov Moscow State University
      • • Division of Chemistry
      • • Faculty of Chemistry
      Moskva, Moscow, Russia
  • 2001–2013
    • Russian Academy of Sciences
      • Kurnakov Institute of General and Inorganic Chemistry
      Moskva, Moscow, Russia
  • 1987–2013
    • Moscow State Forest University
      Mytishi, Moskovskaya, Russia
  • 1998–2008
    • Institute of Petrochemical Synthesis
      Moskva, Moscow, Russia
    • Moscow State University of Fine Chemical Technology
      Moskva, Moscow, Russia
  • 1996–2001
    • Boreskov Institute of Catalysis
      Novo-Nikolaevsk, Novosibirsk, Russia