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  1. No Access

    Article

    Synthesis and Properties of Xerogels Derived from Sulfated Pine Ethanol Lignin

    Organic xerogels based on lignin and tannins isolated from pine bark and wood were for the first time obtained by condensation with formaldehyde and furfuryl alcohol in the presence of hydrochloric acid. Sulfa...

    N. M. Mikova, V. A. Levdanskiy, Ye. V. Mazurova… in Russian Journal of Bioorganic Chemistry (2022)

  2. No Access

    Article

    Synthesis and Properties of Carbon Gels Based on Larch Bark Tannins and Hydrolysis Lignin

    Porous carbon tannin–lignin/formaldehyde and tannin–lignin/furfuryl gels were prepared by carbonization of organic gels synthesized by sol–gel condensation of larch bark tannins and hydrolysis lignin with form...

    N. M. Mikova, I. P. Ivanov, A. M. Zhizhaev… in Russian Journal of Applied Chemistry (2022)

  3. No Access

    Article

    Structure and properties of organic xerogels derived from tannins and ethanol lignins of the Siberian fir

    The organic xerogels, prepared from tannins and ethanol lignins of the fir (Abies sibirica), were synthesized for the first time. The influence of the composition of initial mixture and pH on the characteristics ...

    N. M. Mikova, V. А. Levdanskiy, G. P. Skwortsova… in Biomass Conversion and Biorefinery (2021)

  4. No Access

    Article

    Evaluation of the Validity of Model-Fitting and Model-Free Methods for Kinetic Analysis of Nonisothermal Pyrolysis of Siberian Fir Bark

    The kinetic parameters of the pyrolysis of Siberian fir bark were estimated by thermogravimetric analysis. The thermochemical conversion of the bark biomass was performed at heating rates of 5, 10, and 20 deg/...

    O. Yu. Fetisova, N. M. Mikova, O. P. Taran in Kinetics and Catalysis (2020)

  5. No Access

    Article

    Study of Thermochemical Transformations of Bast of Birch Bark, Structure and Properties of the Produced Porous Carbon Materials

    The porous structure and sorption properties of carbon materials produced by thermochemical activation of the bast of birch bark with potassium hydroxide at 800°C have been studied. The effect of the amount of...

    N. M. Mikova, I. P. Ivanov, O. Yu. Fetisova… in Russian Journal of Applied Chemistry (2020)

  6. No Access

    Article

    Influence Exerted by Cross-Linking Effect on Properties of Sorbents Produced from Aspen and Larch Bark

    Method is suggested for obtaining biochar materials by treatment of a finely dispersed (≤0.1 mm) bark of aspen and(or) larch with a 40% formaldehyde solution and subsequent thermal activation of the activated ...

    N. M. Mikova, G. P. Skvortsova, E. V. Mazurova… in Russian Journal of Applied Chemistry (2019)

  7. No Access

    Article

    A Kinetic Study of the Thermal Degradation of Fir and Aspen Ethanol Lignins

    Thermogravimetric (TG/DTG) methods have been used to study the thermal destruction of fir and aspen ethanol lignins at different heating rates in an inert (argon) medium. For each of the lignins, the main stag...

    O. Yu. Fetisova, N. M. Mikova, N. V. Chesnokov in Kinetics and Catalysis (2019)

  8. No Access

    Article

    Polyphenols of Wood Bark: Organic Precursors for the Production of Polymer Aerogels

    A new method for preparation of organic aerogels by sol–gel polymerization of formaldehyde with polyphenols (PPs), isolated from larch bark and birch bark, was developed. The functional composition and propert...

    N. M. Mikova, L. I. Grishechko, G. P. Skvortsova… in Russian Journal of Bioorganic Chemistry (2018)

  9. No Access

    Article

    Thermal transformation of betulin by alkaline activation

    Carbonization of betulin (betulinol) as an individual carbon precursor was studied in the temperature range of 400–800°C in the presence of KOH. Differential thermal analysis and IR spectroscopy were used to d...

    N. M. Mikova, N. V. Chesnokov, E. V. Mazurova… in Russian Journal of Bioorganic Chemistry (2016)

  10. No Access

    Article

    Porous carbon materials produced by the chemical activation of birch wood

    It was established that the main factors responsible for the yield and specific surface area of porous carbon materials obtained by the chemical activation of the wood of birch are the nature of a modifying ag...

    B. N. Kuznetsov, N. V. Chesnokov, S. I. Tsyganova, N. M. Mikova… in Solid Fuel Chemistry (2016)

  11. No Access

    Article

    Production and properties of porous carbon materials from chemically modified microcrystalline cellulose

    Certain fundamental aspects of how the porous structure is formed in carbon materials produced by pyrolysis of microcrystalline cellulose modified with phosphoric acid, potassium hydroxide, and zinc chloride w...

    B. N. Kuznetsov, N. V. Chesnokov, S. I. Tsyganova… in Russian Journal of Applied Chemistry (2015)

  12. No Access

    Article

    Modifying Effect of Betulinol on Carbon Sorbents Produced from Betula birch Wood

    N. V. Chesnokov, N. M. Mikova, I. P. Ivanov in Chemistry of Natural Compounds (2014)

  13. No Access

    Article

    Effect of methods for thermal and alkaline modification of birch wood on properties of porous carbon materials obtained

    Study of the carbonization of birch wood demonstrated that, under conditions of a preliminary carbonization at a temperature of 400°C, KOH favors better, compared with NaOH, development of the specific surface...

    N. M. Mikova, N. V. Chesnokov, I. P. Ivanov… in Russian Journal of Applied Chemistry (2013)

  14. No Access

    Article

    Properties of palladium catalysts on carbon supports prepared from chemically modified and activated anthracites

    The influence of chemical modification and thermal activation on the porous structure of Donbass anthracites (Ukraine) and on the state and catalytic properties of supported palladium has been studied. The mos...

    B.N. Kuznetsov, N.V. Chesnokov, N.M. Mikova… in Reaction Kinetics and Catalysis Letters (2004)

  15. No Access

    Article

    Texture and catalytic properties of palladium supported on thermally expanded natural graphite

    Data about preparation and properties of palladium catalysts on porous supports prepared by intercalation and subsequent thermal expansion of natural graphite are presented. Some relations between the structur...

    B.N. Kuznetsov, N.V. Chesnokov, N.M. Mikova… in Reaction Kinetics and Catalysis Letters (2003)

  16. No Access

    Article

    Chemical transformations of a SiO2-supported [Fe5RhC(CO)16]− cluster and catalysis of propylene hydroformylation

    Chemical transformations of SiO2-supported [Fe5RhC(CO)16]− and [Fe4RhC(CO)14]− clusters in Ar, CO, and synthesis gas are studied by IR spectroscopy, Mössbauer spectroscopy, and transmission electron microscopy. I...

    V. I. Koval'chuk, N. M. Mikova, A. F. Savitskii… in Russian Chemical Bulletin (1995)

  17. No Access

    Article

    Synthesis of hydrocarbons from CO and H2 on SiO2 supported iron-cobalt clusters

    Bimetallic catalysts (Fe+Co)/SiO2 were prepared by impregnation of SiO2 with solutions of carbonyl clusters [FeCo3(CO)12][(C2H5)4N], [Fe3Co(CO)13][(C2H5)4N], HFeCo3(CO)12, [Fe5CoC(CO)16][(C2H5)4N], and Co2(CO)8, ...

    V. I. Koval'chuk, B. N. Kuznetsov, N. M. Mikova, A. A. Efremov… in Russian Chemical Bulletin (1993)

  18. No Access

    Article

    Synthesis of heterometallic octahedral clusters containing three kinds of metal atoms

    V. E. Lopatin, N. M. Mikova, S. P. Gubin in Bulletin of the Academy of Sciences of the… (1983)

  19. No Access

    Article

    Preparation and structure of iron carbidocarbonyl cluster [(C2H5)4N][Fe5RhC(CO)16]

    The thermolysis of the reaction products of Fe(CO)5 with sodium amalgam in diglyme under certain conditions leads directly to Na2[Fe5(CO)14]. The latter in diglyme solution exhibits a high reactivity toward metal...

    V. E. Lopatin, N. M. Mikova, S. P. Gubin in Bulletin of the Academy of Sciences of the… (1983)