Vitalii O. Yevdokymenko

• Doctor of Philosophy
• Head of Department at V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry the National Academy of Sciences of Ukraine

Most of the known methods for the chemical production of nickel nano- and microparticles, nickel oxides and hydroxides use various reducing agents and solvents, which are often toxic to the environment.

Thermo-reactive polymer composite based on novolac type phenol-formaldehyde resin (NR) and polyvinyl butyral (PVB) has been synthesized by co-condensation of the resins at a mass ratio of 1:1. According to thermal gravimetric analysis data, the thermal degradation point of the composite is 320°С. The results of mechanical testing indicate that the...

Air-dry hemp hurd, waste after the fibre extraction from technical hemp, was used for the research. It has the following characteristics: humidity of 8%, the proportion of organic components to dry weight of 97.3% (cellulose – 48.4, hemicellulose – 25.8, lignin – 20.9 %mass) and inorganic components – 2.7%. To obtain microcrystalline cellulose, the...

The main idea of this work is the investigation of structural and morphological characteristics of microcrystalline cellulose with switchgrass (Panicum virgatum L.) by the method of organo-solvent cooking with the addition of various brands of ion-exchange resins instead of sulfuric acid. A sulfonated copolymer of styrene and divinyl benzene with t...

The aim of our work was to study the morphological and structural properties of the industrial methanol synthesis catalyst trademark CHM-Y before and after exposure to low-frequency oscillations in situ. The samples were examined by various methods, including XRD, FTIR-ATR, DTG/TGA, DSC, low-temperature adsorption-desorption of N2, SEM. According...

The aim of our work was to investigate the possibility of obtaining precursors for chemical synthesis from polyethylene bags and polyethylene terephthalate bottles by two-stage thermolysis at 750 and 1000 oC. It was established that the main products are gases. During the thermolysis of polyethylene bags, the main combustible gases are C1-C3 and hy...

The developed and software-implemented simplified three-dimensional mathematical model of the unsteady-state process of HFS desublimation is described. The study of regularities in the HFS desublimation process is performed by numerical modeling.

In this paper it is discussed the colloidal-chemical method of synthesis of dispersed composite bentonite-ferromagnetic powders that are stable to oxidation. It is shown that for this purpose it is advisable to use acid-activated bentonite clay with a high content of clay mineral - montmorillonite. Modified bentonite is a slightly amorphized silica...

It is known that the physicochemical characteristics of amorphous SiO2 are influenced by the raw material, process temperature, pH of the reaction medium, the ratio of reagents, the addition of coagulant, and modes of washing and drying. Previously, a waste-free technology for the production of biogenic silicon dioxide was described. However, there...

The CO2 processing into renewable fuels and platform chemicals is an important aspect of reducing CO2 emissions. Methanol, the main liquid product of the hydrogenation of CO2 with hydrogen from renewable energy sources, can serve as a carrier for energy storage for its future use in various applications such as heating, cooking and transportation....

Проведено аналіз можливостей використання відновлюваних джерел енергії та біомаси в Україні для виробництва альтернативного палива — паливних брикетів. Показано, що Україна має великі запаси відновлюваних джерел енергії та біомаси: потенціал енергії з біомаси складає 23 млн т нафтового еквіваленту, що достатньо для заміщення всього імпорту газу, ву...

The main idea of this work is to study the possibility of obtaining microcrystalline cellulose from multi-ton and low-value agricultural waste and investigation its structural properties. Air-dry soybean straw, an agricultural waste, was used for the research. Microcrystalline cellulose (MCC) was obtained from it by the method of organo-solvent coo...

New bi- and polymetallic complexes of polygalacturonic acid with essential trace elements for pre-sowing treatment of winter wheat seeds were created. Aims: The goal of the research was to create effective environmentally safe preparations of multifunctional action, with low cost rates for grain crops based on natural polymers of pectin nature and...

V Українська конференція з високомолекулярних сполук з міжнародною участю В ВМС-2022 Присвячується 95-річчю від дня народження академіка НАН України ЮРІЯ СЕРГІЙОВИЧА ЛІПАТОВА Київ, 25-27 жовтня, 2022 ХV Ukrainian conference on macromolecules with international participation VMS-2022 The conference is dedicated to the 95th anniversary of the birth o...

To mitigate the isopropylbenzene hydrocracking reaction on a classic industrial aluminum-nickel-molybdenum (ANM) catalyst , the latter was optimized by creating a composite membrane catalyst in combination with a proton current. In this work, the ANM-synthesized catalyst used as a component of the hydrocracking membrane catalyst simultaneously play...

Air-dry soybean straw, a technical crop, was used for the research. MCC was obtained from it by the method of organ-solvent cooking described in [1]. From the latter received nanocellulose (NC) by a known method [2]. Using the methods of XRD, XRF, FTIR-ATR, AFM, TGA and DSC, the structure and morphology of MCC and nanocellulose were studied. The in...

Thermolysis of pulp and paper waste was studied. It was established that at a temperature of 450 oC, about 28% of hydrocarbons can be obtained, of which the gasoline fraction is 45%, the diesel fraction is 45%, and fuel oil is 10%.

An effective method of processing one of the anthropogenic wastes - waste paper - into valuable substances and materials is proposed in this paper. The thermolysis of waste paper was studied in a laboratory installation at a temperature of 400-500 °C and atmospheric pressure. According to the obtained laboratory results, a technological scheme of a...

The unique characters of nanocellulose (NC), such as superior mechanical properties, low density, high specific surface area, and low thermal expansion coefficient, make them an ideal building block for flexible functional compounds. That is why determining the structural and morphological characteristics of the obtained NC is a priority. From the...

From the microcrystalline cellulose obtained from air-dry soybean straw by the method of organ-solvent cooking obtained nanocellulose (NC). Using the methods of XRD, XRF, FTIR-ATR, AFM, TGA and DSC, the structure and morphology of nanocellulose were studied. Due to the destruction of amorphous binders in the original MCC, regardless of the conditio...

Nowadays, one of the promising areas is the chemical utilization of carbon oxides in chemicals and fuels. This direction is extremely attractive because it not only reduces global warming caused by increasing atmospheric CO2 concentrations but also offers solutions to replace exhaustible fossil fuels. However, it is well known that carbon oxides ar...

Nowadays, one of the promising areas is the chemical utilization of carbon oxides in chemicals and fuels. This direction is extremely attractive because it not only reduces global warming caused by increasing atmospheric CO2 concentrations but also offers solutions to replace exhaustible fossil fuels. However, it is well known that carbon oxides ar...

The most selective conversion of CO2 into the target product is possible only by using efficient catalysts and catalytic processes. This can be achieved by creating the necessary structure (texture) of the catalyst or technological optimization of the heterogeneous catalytic process. Hydrogenation in the conditions of mechanical activation and arti...

A process on advanced membrane catalysts is proposed. It allows to concentrate alcohols and conduct a reaction with high selectivity at the same time. The studies were performed in a laboratory setting. It allowed the use of membranes as both concentrators of alcohols and catalysts for dehydration. It is shown that the organization of ether product...

Ethers are used in large quantities as anaesthetics, refrigerants, propellants and as universal solvents in uranium enrichment, dewaxing of lubricants. They are also used as oxygenating, anti-knock additives to gasoline. The expansion of the use of ethers as motor fuels requires the creation of high-performance catalysts for the processes of their...

Nowadays, the use of organo-mineral fertilizers in agricultural production is one of the main measures to address the environmental and food security of the country. Our research suggests that excess sludge from the aeration station and processed vegetable waste in the OMF are valuable raw materials for the creation of granular agrochemically effec...

Шляхом водної екстракції, описаної раніше, одержано зразок гарбузового пектину. Структуру та морфологію гарбузового пектину досліджено різними фізико-хімічними методами: низько температурною адсорбцією-десорбцією азоту, рентгенівською дифрактометрією (XRD), інфрачервоним спектральним аналізом із Фур’є перетворенням (FTIR-ATR) у режимі неповного від...

Mechanical activation is a simple, fast, cost-effective green technology that has been used for the upgrading and modification of microcrystalline cellulose (MCC). However, there is no information on the effect of short-term grinding on its physicochemical properties, as it is widely used for obtaining MCC powder or smaller particle with a size bel...

Silicon carbide, due to unique physicochemical properties (thermal and chemical stability, oxidation and corrosion resistance, high hardness, resistance to radiation damage), is used to produce oxygen-free ceramics, semiconductors, Schottky diodes, UV sensors, covering of the spaceship hull, and for the fusion reactor wall. Dependent on the way and...

Microbiological conversion of biosphere renewable resources to produce useful products, in particular biofuels, is currently one of the pressing problems of biotechnology. To establish a microbiological production of biobutanol at an industrial scale, strains with high-yield solvent production on plant biomass as a cheap substrate are needed. This...

Показано, що частота відхилення якості питної води водопроводів України від нормативних вимог є основною причиною того, що для населення України актуально використання підземних питних вод нецентралізованого водопостачання. Виявлено, що іонно-молекулярний склад підземних вод Київської області не стабільний внаслідок тріщинуватості водотривких порід...

Plant-based biogenic silicon dioxide nanoparticles are used to produce catalysts, additives, templates for deposition of other semiconductors and metals, nanomaterials with novel properties, bio-nanocomposites for biomedical, energy and environmental fields. There are too many ways of bio-SiO2 production. Dependent on the way and obtaining conditio...

The main challenge today is to find new alternative energy sources. Reduction of oil, gas and coal production can be achieved through the rational use of biomass as a raw material for fuels and lubri-cants. Thermochemical treatment of biomass allows to obtain raw materials for a number of process-es, in particular the separation of hydrocarbon comp...

The main challenge today is to find new alternative energy sources. Reduction of oil, gas and coal production can be achieved through the rational use of biomass as a raw material for fuels and lubricants. Thermochemical treatment of biomass allows to obtain raw materials for a number of processes, in particular the separation of hydrocarbon compon...

Microcrystalline cellulose (MCC) has been used in various fields (pharmaceutical, food, cosmetic and chemical). The aim of our work was the investigation of the local agriculture residues using as the MCC’s source. The properties of the prepared MCC were investigated using different methods: low-temperature nitrogen sorption-desorption, X-ray diffr...

It was shown that the treatment of plant material in the conditions of autohydrolysis allows destroying the original compact, strong structure into individual components. For microcrystalline cellulose (MCC), total conversion increases by 6-18% with a high crystallinity index (IC) of 0.81. It has been established that during the alkaline treatment...

Their chemical composition determines the list of products that can be obtained from plant material. It is known that rice waste (straw and husk) is, unlike other crops, silicon concentrators, which are part of a mature plant in the form of amorphous silica. Rice husk mainly consists of lignin, cellulose, hemicellulose, SiO2 and a small number of m...

Important environmental problems related to the processing of municipal wastewater sludge have been discussed. The proposed technological solution includes the following stages: sludge pretreatment; its thermal decomposition with formation of high-energy gas; production of organo-mineral fertilizers and synthetic soil; obtaining of fuel pellets; re...

The catalytic process for methanol production by synthesis gas conversion under the conditions of mechanochemical activation (MCA) of copper-zinc-aluminum oxide catalyst in the temperature range 160–280 °C at a pressure of 0.1 MPa are investigated. The use of mechanical action force is one of the promising ways to improve the activity of heterogene...

High porous carbon material was prepared by template synthesis. Ni-carbon materials were formed by deposition of Ni2+ salts into the carbon supporter pores and by following reducing of adsorbed Ni2+ to Ni. The structure peculiarities of nickel— carbon materials were studied by small-angle X-ray scattering methods. Obtaining Ni-carbon materials used...