A5035850595- Lignin and Wood Chemistry
- Biofuel production and bioconversion
- Catalysis for Biomass Conversion
- Advanced Cellulose Research Studies
- Polysaccharides and Plant Cell Walls
- Enzyme-mediated dye degradation
- Polysaccharides Composition and Applications
- Plant biochemistry and biosynthesis
- Microbial Metabolites in Food Biotechnology
- Biochemical and biochemical processes
- Dyeing and Modifying Textile Fibers
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Arctic and Russian Policy Studies
- Thermochemical Biomass Conversion Processes
- Catalysis and Hydrodesulfurization Studies
- Coal and Coke Industries Research
- Steroid Chemistry and Biochemistry
- Biodiesel Production and Applications
- Synthesis of heterocyclic compounds
- Advanced oxidation water treatment
- Cholesterol and Lipid Metabolism
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Free Radicals and Antioxidants
- Water Quality Monitoring and Analysis
Institute of Chemistry and Chemical Technology
2015-2024
Russian Academy of Sciences
2020-2024
Krasnoyarsk Scientific Center
2021-2023
Siberian Federal University
2020-2023
Siberian Branch of the Russian Academy of Sciences
2015-2022
Xanthan is an important polysaccharide with many beneficial properties. Sulfated xanthan derivatives have anticoagulant and antithrombotic activity. This work proposes a new method for the synthesis of sulfates using sulfamic acid. Various N-substituted ureas been investigated as process activators. It was found that urea has greatest activating ability. BBD sulfation acid in 1,4-dioxane carried out. shown optimal conditions (13.1 wt% sulfur content) are: amount sulfating complex per 1 g 3.5...
Spruce (Piceaabies) wood hemicelluloses have been obtained by the noncatalytic and catalytic oxidative delignification in acetic acid-water-hydrogen peroxide medium a processing time of 3–4 h temperatures 90–100 °C. In process, H2SO4, MnSO4, TiO2, (NH4)6Mo7O24 catalysts used. A polysaccharide yield up to 11.7 wt% has found. The hemicellulose composition structure studied complex physicochemical methods, including gas gel permeation chromatography, Fourier-transform infrared spectroscopy,...
Thermal conversion of flax shives was studied in sub- and supercritical ethanol medium at 225 250 °C the presence bifunctional catalyst 3% Ru/C. The use Ru/C process thermal found to increase by 27% yield liquid products 10%. led destruction both lignin cellulose. degree delignification non-catalytic increased upon transition from subcritical (225 °C) (250 conditions. Main monomeric were guaiacylpropene or guaiacylpropane depending on temperature. In catalyst, molecular weight distribution...
In this study, hemicelluloses of aspen wood (Pópulus trémula) were obtained by oxidative delignification in an acetic acid-water-hydrogen peroxide medium at temperatures 70-100 °C and a process time 1-4 h. The maximum polysaccharide yield up to 9.68 wt% was reported. composition structure the studied using complex physicochemical methods: gas gel permeation chromatography, Fourier-transform infrared spectroscopy, 2D nuclear magnetic resonance thermogravimetric analysis. xylose, mannose,...
Flax shive is the main waste (up to 70 wt %) in production of flax fiber. It represents lignified parts stem mainly form small straws. Complex processing such wastes a significant problem due heterogeneity chemical structure lignin. This article presents results reductive catalytic fractionation (RCF) ethanol and isopropanol at elevated temperatures (225–250 °C) presence bifunctional catalyst (Ru/C) molecular hydrogen. provides solvolytic depolymerization lignin hemicelluloses presented...
Reductive catalytic fractionation (RCF) has emerged as an effective lignin-first biorefinery strategy to depolymerize lignin into tractable fragments in high yields. Herein, we propose the RCF of spruce wood over a Ru/C bifunctional catalyst medium ethanol and molecular hydrogen produce monomeric phenolic compounds from lignin, polyols hemicelluloses, microcrystalline cellulose. This contribution attempts elucidate role catalysts characteristics. The results clarify particular effect carbon...
Water-soluble azo derivatives of lignin were synthesized by the coupling reaction using organosolv ethanol and diazonium salts based on sulfanilic acid p-nitroaniline. The structure studied nuclear magnetic resonance, Fourier-transform infrared spectroscopy, gel permeation chromatography. It was found that azobenzene bonds formed in macromolecules impart photosensitive properties to polymers via cis–trans photoisomerization diazobenzene group. shown experimentally exhibited good solubility...
The process of sulfation arabinogalactan—a natural polysaccharide from Larix sibirica Ledeb.—with sulfamic acid in 1,4-dioxane using different activators has been studied for the first time. dynamics molecular weight sulfated arabinogalactan upon variation temperature and time with investigated. It found that, as increases 10 to 90 min, weights reaction products grow due introduction sulfate groups without significant destruction initial polymer products. Sulfation at 95 °C 20 min yields a...
Imidazole derivatives have found wide application in organic and medicinal chemistry. In particular, benzimidazoles proven biological activity as antiviral, antimicrobial, antitumor agents. this work, we experimentally theoretically investigated N-Butyl-1H-benzimidazole. It has been shown that the presence of a butyl substituent N position does not significantly affect conjugation structural organization benzimidazole. The optimized molecular parameters were performed by DFT/B3LYP method...
Noble metal-based catalysts are widely used to intensify the processes of reductive fractionation lignocellulose biomass. In present investigation, we proposed for first time using inexpensive NiCuMo/SiO2 catalyst replace Ru-, Pt-, and Pd-containing in process abies wood into bioliquids cellulose products. The optimal conditions hydrogenation were selected provide effective depolymerization lignin (250 °C, 3 h, initial H2 pressure 4 MPa). composition structure liquid solid products...
To ensure the high quality of water, it is necessary to remove toxic pollutants. At present, purification water implemented using various sorbents. The efficient sorption materials are modified polysaccharides. In this study, we report on a new environmentally friendly method for modifying larch hemicellulose—arabinogalactan (AG)—with polybasic carboxylic acids (citric, succinic, oxalic, and adipic) obtain composite materials. synthesized AG derivatives have been explored by complex...
Hydrogenation of flax shives in ethanol over bifunctional Ni/C catalysts at 225 °C has been studied. It shown that the 10% catalyst enhances yield monomeric products from 1.1 to 9.7 wt %, decreases solid product content 45 35 and increases degree delignification 91%. The main compounds obtained during hydrogenation are propyl guaiacol propenyl guaiacol. established an increase mass transfer intensity via increasing stirring rate or decreasing grain size leads total propanol yield. Alkaline...
For the first time, fractionation of birch wood into microcrystalline cellulose, xylose and methoxyphenols is suggested based on integration alkali-acid pretreatments hydrogenation in ethanol over a bifunctional Ru/C catalyst. It established that removal hemicelluloses during influences yields liquid, gaseous solid products non-catalytic catalytic pretreated samples at 225 °C. The Ru/carbon catalyst affects different ways conversion initial acid- alkali-pretreated wood. most noticeable...
The reductive catalytic fractionation of flax shives in the presence bimetallic NiRu catalysts supported on oxidized carbon materials (CM) such as mesoporous Sibunit and mesostructured by KAIST (CMK-3) was studied. based CMK-3 were characterized a higher surface area (1216 m2/g) compared to ones (315 m2/g). catalyst (10Ni3RuC400) more uniform distribution Ni particles, contrast Sibunit-based (10Ni3RuS450), which large agglomerated particles (300-400 nm) presented. found be selective towards...
The influence of sulfuric acid catalyst concentration on hydrolysis birch wood hemicelluloses under mild conditions (temperature 100 °С and atmospheric pressure) was studied.It found that the maximum yield xylose (72,4-77,1 % wt. initial content in birch) is achieved at a H 2 SO 4 2-3 by weight process duration 5 hours.According to gas chromatographic analysis obtained hydrolysates contain mainly xylose, minor amounts mannose glucose.The solid products cellulose (56,8-70,4 wt.), lignin...
A new method for extractive-catalytic fractionation of aspen wood to produce microcrystalline (MCC), microfibrillated (MFC), nanofibrilllated (NFC) celluloses, xylan, and ethanollignin is suggested in order utilize all the main components biomass. Xylan obtained with a yield 10.2 wt.% via aqueous alkali extraction at room temperature. Ethanollignin was 11.2 60% ethanol from xylan-free 190 °C. The lignocellulose residue formed after xylan subjected catalytic peroxide delignification acetic...
Arabinogalactan depolymerization over solid Zr-containing SBA-15-based catalyst was studied via HPLC, GPC, and theoretical modeling. Arabinogalactans (AG) are hemicelluloses mainly present in larch wood species, which can be extracted on an industrial scale. The application of acid catalysts the processes hemicellulose conversion exclude serious drawbacks such as equipment corrosion, etc. Characterization 5%Zr-SBA-15 confirmed successful formation mesoporous structure inherent to SBA-15 with...