Dmitry Selishchev

Boreskov Institute of Catalysis · Department of Unconventional Catalytic Processes

A biotemplate method was used for the synthesis of self-doped TiO2 photocatalysts via the impregnation of sheep wool fibers with a solution containing titanium hydroxocomplexes under mild hydrothermal conditions (115 °C, 170 kPa), followed by the removal of the wool template during calcination in air at 600 °C. An intermediate-wool TiO2 composite,...

The use of technologies based on combustion of carbon-containing fossil fuel leads to emission of large amounts of CO2, one of the main greenhouse gases, into the atmosphere. To reduce the CO2 level in the atmosphere, systems for CO2 sorption from various gas sources are being developed. The systems allowing the CO2 sorption and desorption at low t...

In addition to the band gap of a semiconducting photocatalyst, its band edges are important because they play a crucial role in the analysis of charge transfer and possible pathways of the photocatalytic reaction. The Mott−Schottky method using electrochemical impedance spectroscopy is the most common experimental technique for the determination of...

Polymeric floating photocatalysts based on polyethylene (PE)/TiO2 compositions were synthesized by in situ ethylene polymerization in the presence of a titanium–magnesium catalyst synthesized by the sequential deposition of a magnesium–aluminum complex and TiCl4 on commercial TiO2 P25. The optical band gap of the synthesized PE/TiO2 composites was...

In this study, the high-loaded copper-containing catalysts modified with Fe and Al were successfully applied for the hydroconversion of furfural to furfuryl alcohol (FA) or 2-methylfuran (2-MF) in a batch reactor. The synthesized catalysts were studied using a set of characterization techniques to find the correlation between their activity and phy...

In this study, composite materials based on nanocrystalline anatase TiO2 doped with nitrogen and bismuth tungstate are synthesized using a hydrothermal method. All samples are tested in the oxidation of volatile organic compounds under visible light to find the correlations between their physicochemical characteristics and photocatalytic activity....

To elucidate the role of high valence manganese and surface lattice oxygen in catalyst for catalytic combustion of toluene, herein, a porous LaMnO3 catalyst was firstly fabricated using ordered mesoporous carbon (OMC) as a hard-template. Compared with pristine LaMnO3-bulk, the optimal porous LaMnO3 exhibited boosted catalytic performance for toluen...

This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of...

Chemical modification of cotton-rich fabrics with TiO2 nanoparticles results in photoactive self-cleaning textiles, which can provide, under UV or solar radiation, complete oxidation of low-molecular compounds, degradation of supramolecular structures, and inactivation of microorganisms due to the photocatalytic effect. In this paper, we describe,...

We herein report the selective photooxidation of primary and secondary benzylic alcohol to the corresponding carbonyl compounds over titanium dioxide in acetonitrile under visible light irradiation. To enhance the understanding in which way parameters influence the reaction rate, several factors, such as initial concentration, catalyst amount, ligh...

The dependence of action spectra for pristine and Cu-grafted anatase TiO2 on temperature for photocatalytic acetone vapor oxidation at 40, 100 and 140 °C is described. The results obtained demonstrate the thermal inhibition of activity under UV irradiation for pristine titania at 140 °C, while for TiO2 grafted with copper species this inhibition is...

The development of active and stable photocatalysts for the degradation of volatile organic compounds under visible light is important for efficient light utilization and environmental protection. Titanium dioxide doped with nitrogen is known to have a high activity but it exhibits a relatively low stability due to a gradual degradation of nitrogen...

Five commercially available TiO2 powder photocatalysts and 8 series of synthesized in laboratory TiO2-based samples, containing deposited Mn, Cu, Pt, and Ag, have been studied in test reaction of complete oxidation of gaseous VOC under UV (370 nm) and blue (440 nm) light at a temperature within a range 40-140 ℃. The dependencies of the activity on...

This paper describes a simple technique for the modification of titania with copper to enhance its photocatalytic performance. In addition to the absorption of UV light resulted in band-to-band excitation of electrons, TiO2 grafted with copper species absorbs radiation in the visible region of spectrum, and it is able to completely oxidize volatile...

In this study, various solid uranium oxycompounds and TiO2-supported materials based on nanocrystalline anatase TiO2 are synthesized using uranyl nitrate hexahydrate as a precursor. All uranium-contained samples are characterized using N2 adsorption, XRD, UV–vis, Raman, TEM, XPS and tested in the oxidation of a volatile organic compound under visib...

Experimental dependency of the photosystem's response on the wavelength of exciting radiation, also known as action spectrum, may be substantially affected by the spectrum shape of this radiation. This is especially important in the case, when different radiation sources are used for the investigation of action spectrum. For instance, too wide emis...

This paper describes a simple method for the modification of TiO2 surface with palladium to prepare a highly active photocatalyst for oxidation of benzene micropollutants in air. The method consists of the impregnation of anatase TiO2 with a solution of palladium (II) acetate (Pd(OAc)2) in acetone followed by photodecomposition of Pd(OAc)2 under UV...

In this paper, we show the action spectra for five commercially available TiO2 photocatalysts and a uranyl-modified TiO2 photocatalyst prepared in laboratory. The action spectra are evaluated as spectral dependencies of photonic efficiency in the complete oxidation of acetone vapor under radiations from UV to visible range (367-734 nm) provided by...

A nanoarchitectural approach based on in situ formation of quantum dots (QDs) within/outside clay nanotubes was developed. Efficient and stable photocatalysts active under visible light were achieved with ruthenium‐doped cadmium sulfide QDs templated on the surface of azine‐modified halloysite nanotubes. The catalytic activity was tested in the hyd...

In order to increase the catalytic activity of titanium dioxide (TiO2) under visible light, a method for the synthesis of a complex sandwich catalyst based on nanotubular and sol–gel TiO2 and colloidal cadmium sulfide (CdS) was developed. The use of titanium dioxide in the form of nanotubes allowed increasing the specific surface area of the cataly...

The effect of TiCl₄ hydrolysis temperature on the structural, textural and morphological properties of the resulting rutile and on the changes of these properties upon calcination was studied. The XRD, Raman spectroscopy, mercury porosimetry, BET, SEM and TEM studies have revealed that TiO₂ rutile has a hierarchical 3D-architecture. The obtained na...

Photocatalysts based on zinc hydroxide and a solid solution of CdS and ZnS were prepared via the precipitation method and used for photocatalytic hydrogen production from aqueous solutions of inorganic (Na2S/Na2SO3) and organic (ethanol) sacrificial agents. The photocatalysts were tested in cyclic experiments for hydrogen evolution and studied usin...

In this paper, we show a synergistic effect of polychromatic radiation on the visible light activity of a TiO2 photocatalyst doped with nitrogen. This effect consists in the fact that N-doped TiO2 has no photocatalytic activity under red light, but a combination of blue and red lights enhances the utilization of blue light in the photocatalytic oxi...

The TiO2 photocatalyst doped with nitrogen was synthesized via a precipitation method and investigated in the oxidation of acetone vapor under UV (371 nm) and visible light (450 nm). The data were collected in a continuous-flow set-up equipped with a long-path IR gas cell for in situ analysis of oxidation products and evaluation of the photocatalyt...

Three commercially available TiO2 powder photocatalysts and additional one synthesized in laboratory via the modification of anatase TiO2 with uranyl nitrate (5 wt.%) have been studied in the complete oxidation of several VOCs under UV (367 nm) and visible (450 nm) light. The kinetic curves for VOC removal, intermediate formation, and final product...

Macroporous oxides are often prepared by template method with polymeric spheres, however, these polymeric spheres synthesized by emulsion polymerization using different initiators, most commonly contain S or/and N chemical residues. We have found that these template-originated impurities are not completely removed after thermal treatment of composi...

Novel photocatalysts consisting of a cadmium and zinc sulfide solid solution (Cd1-xZnxS) were successfully prepared by a simple two-step technique. The as-obtained materials were characterized by X-ray diffraction, UV-VIS diffuse reflection spectroscopy, and low temperature N2 adsorption techniques. The photocatalysts were tested in the photocataly...

A wide range of experimental data are reported for the first time on the TiO2 prepared by hydrolysis of highly concentrated Ti(OⁱPr)4 in water solutions of quaternary ammonium compounds (QACs). These TiO2 materials have been shown to be photocatalytically active under visible light irradiation (LED, 450 nm) using acetone as a model substrate oxidiz...

The silica, alumina, ceria, and titania supports were modified with uranyl ions (5 wt.%) and investigated using X-ray photoelectron spectroscopy. The data show the U4f photoelectron spectra and charge state of uranium for uranyl ions deposited on different supports. The additional in situ XPS experiments with simultaneous irradiation of the sample...

The TiO2 and composite TiO2/zeolite catalysts were investigated in the photocatalytic oxidation of model volatile organic compounds. The photocatalytic experiments were performed in a batch reactor using an FTIR in situ method for the detailed analysis of the reaction components in the gas phase. The kinetic data for the TiO2 and composite TiO2/zeo...

In this study, 0.1-4 wt.% Pd-loaded catalysts were synthesized via thermal decomposition of palladium (II) acetylacetonate (Pd(acac)2) at 210-310 °C or its photodecomposition under UV-LED irradiation using anatase TiO2 as a support. The catalysts were characterized by X-ray fluorescence, TEM, XPS, and CO chemisorption analyses and tested for CO oxi...

The purification of air polluted by volatile organic compounds (VOCs) using the TiO2-mediated photocatalytic oxidation (PCO) method was analyzed from a hygienic point of view by the evaluation of the total hazard during the process. For this purpose, the photocatalytic oxidation of various VOCs, including acetone, alcohols, hydrocarbons, and hetero...

Invention relates to development of a method for photocatalyst production based on titanium dioxide modified with platinum particles, exhibiting activity under ultraviolet radiation in the reaction of carbon monoxide photocatalytic oxidation at room temperature. Photocatalyst is intended mainly for photocatalytic purification of air from carbon mon...

The TiO2 catalysts supported with 0.01-4 wt.% Pt, Pd, or Au were prepared via chemical reduction of inorganic precursors with NaBH4 or their photoreduction in water-ethanol solution under UV irradiation. The samples were characterized by the means of X-ray fluorescence, N2 adsorption, TEM, XPS and UV-Vis spectroscopy and investigated in the process...

Photocatalytic oxidation (PCO) of volatile organic compounds (VOCs) including acetone, alcohols and hydrocarbons was investigated in a static reactor using an FTIR in situ method. Three commercially available TiO2 powders and one TiO2 sample synthesized via thermal hydrolysis of titanyl sulfate were employed in the kinetic experiments. PCO reaction...

Photocatalytic reduction of gaseous CO2 by water vapor without any additional sacrificial electron donors was studied on TiO2 P25 as photocatalyst. Formation of oxygen, hydrogen, C1–C4 hydrocarbons, as well as methanol, ethanol and acetone was observed under the high power UV-LED illumination. Complete photocatalyst deactivation was observed after...

Программа позволяет рассчитывать площадь полосы ИК поглощения вещества в условиях мешающего влияния других веществ с полосами поглощения в близких диапазонах. Обработка может быть выполнена как в ручном режиме для отдельного спектра, так и в автоматическом для серии спектров. Результат расчетов выводится в графическом и текстовом виде. Программа пр...

Программа предназначена для управления с компьютера измерительным стендом определения фотокаталитической активности материалов. Программа позволяет управлять скоростью потока реакционной смеси, влажностью, концентрацией исследуемого субстрата, температурой реактора, переключать режимы анализа начальной и конечной реакционной смеси, включать и выклю...

Фотокаталитический сорбирующий материал для фотокаталитической и адсорбционной очистки газовых и водных сред, характеризующийся тем, что представляет собой структурно-организованную систему, состоящую из текстильной тканевой основы, промежуточного изолирующего слоя из пористого диоксида кремния и наружного фотокаталитически активного слоя, представ...

Material is a structurally organized system which consists of a fabric base coated with an intermediate silicon dioxide layer and an outer layer of photocatalytically active nanocrystalline titanium dioxide of an anatase modification.

Invention relates to the field of production of self-cleaning fabric material having the photocatalytic activity under the action of ultraviolet and visible radiation and intended for the photocatalytic destruction of hazardous organic and inorganic substances and macromolecules. The method of production of the material comprises impregnating of th...

The kinetics of photocatalytic oxidation of ethanol vapors under visible light (l > 420 nm) on the TiO2 modified with noble metal (Au and Ag) and ions (Pt, Pd and Ru) is studied. The effect of the modificator on the activity of Au/TiO2 and Pt/TiO2 photocatalysts is studied. The optimum metal content is ~1 wt.%. The quantum efficiency is calculated...

Исследованы кинетические зависимости фотокаталитического окисления паров этанола с использованием диоксида титана, модифицированного благородными металлами (Au и Ag) и ионами (Pt, Pd и Ru), при облучении светом с длиной волны > 420 нм.

Composite TiO2/activated carbon (TiO2/AC) and TiO2/SiO2 photocatalysts with TiO2 contents in the 10 to 80 wt. % range were synthesized by the TiOSO4 thermal hydrolysis method and characterized by AES, BET, X-ray diffraction and FT-IR ATR methods. All TiO2 samples were in the anatase form, with a primary crystallite size of about 11 nm. The photocat...

В современном мире с высоким уровнем технологического прогресса человек постоянно сталкивается с проблемой загрязненности окружающей среды, обусловленной, главным образом, опасными выбросами промышленности, энергетики и транспорта. Поэтому в настоящее время актуальным является развитие природоохранных технологий, направленных на защиту окружающей с...

Invention relates to filtration materials intended for cleaning air of vapors and gases of an healthy substances. Proposed invention covers filtering sorbent comprising cloth base, silicon dioxide and photo catalytically active titanium dioxide in the anatase form. Titanium dioxide-to-silicon dioxide weight ratio makes (1-3): 5. Proposed method com...

Invention can be used for photocatalytic and adsorption treatment of gaseous and aqueous media contaminated with organic and inorganic substances. The composite photocatalyst consists of an adsorbent, silicon dioxide and a photocatalyst, each granule being a three-layer particle consisting of an inner layer - activated carbon or aluminium oxide or...

Invention relates to composition of structure-organised material based on woven inorganic material. The surface of inorganic material is coated with a composite photocatalytically active material based on a large specific surface area adsorbent with deposition of an intermediate insulating layer of silicon dioxide and an outer active layer of a pho...

A series of TiO2/AC composite photocatalysts with various TiO2 contents was prepared by thermal hydrolysis method of a TiOSO4 water solution in the presence of activated carbon particles. XRD. SEM and BET methods revealed that in all cases deposited TiO2 is an anatase with similar to 170 m(2)/g specific surface area. All samples were tested in gase...

Adsorption properties of the photocatalytic system also influence the rate of photocatalytic processes especially in the low concentration region which is obvious from the classic Langmuir-Hinshelwiid dependence of the product formation rate on the gas concentration of a substrate/ In this case, the rate of photooxidation is in direct proportion to...

The influence of adsorbent on the kinetics of (photo)catalytic oxidation processes was studied using the simple single and double stage reaction mechanisms with the adsorption stages corresponding to Langmuir model. It was found that in the static reactor in all cases the usage of adsorbent leads to the prolongation of substrate (A) removal and pro...

Invention relates to a photocatalyst composition based on carbon material with large specific surface area with a deposited photocatalyst based on titanium dioxide or titanium dioxide which is modified with noble metals, mainly used for photocatalytic purification of air and water, contaminated with molecular impurities of organic or inorganic natu...