Перегляд за Автор "Volkova, V. Y."
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Документ Bentonite modified with ions of transition metals in the reaction of ozone decomposition(2016) Truba, Alla S.; Dzhyga, Ganna M.; Rakitskaya, Tatiana L.; Nahaievska, Anna V.; Volkova, V. Y.; Джига, Ганна Михайлівна; Джига, Анна Михайловна; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна Леонидовна; Труба, Алла Сергіївна; Труба, Алла СергеевнаSince the catalysts required for ozone decomposition in individual and collective protective devices must be in a suitable solid form, their active components are usually anchored on different supports. As such supports, natural aluminosilicates are of special interest due to their availability and cheapness.Документ Catalytic activity of Pd(II) and Cu(II) complexes anchored to natural and pre-modified bentonite in the oxidation of carbon monoxide(2015) Rakitskaya, Tatiana L.; Vasylchenko, E. G.; Kiose, Tetiana O.; Gryshchouk, Galyna V.; Dzhyga, Ganna M.; Volkova, V. Y.; Джига, Ганна Михайлівна; Джига, Анна Михайловна; Кіосе, Тетяна Олександрівна; Киосе, Татьяна Александровна; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна ЛеонидовнаThe influence of different methods of pre-modification (thermal, hydrothermal, and acid-thermal) of natural bentonite on the catalytic activity of bentonite-anchored palladium(II) and copper(II) complexes in lowtemperature oxidation of carbon monoxide has been studied. The contributions of weakly and strongly bound Pd(II) and Cu(II) forms to the total activity of the catalysts were evaluated by two methods, desorption of the metal ions and a kinetic method.Документ Catalytic properties of iron oxides in the reaction of low-temperature ozone decomposition(2017) Truba, Hanna M.; Rakitskaya, Tatiana L.; Stoyan, A. A.; Volkova, V. Y.; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна Леонидовна; Труба, Ганна Миколаївна; Труба, Анна НиколаевнаIron oxides show low activity as catalysts of redox reactions at ambient temperature and normal pressure. However, the significant attention paid to them lately is caused by the possibility to obtain the desired phase composition, physicochemical properties and, as a result, maximum catalytic activity by varying the nature of their precursors, the ratio of their components, the temperature of their calcination and other factors.Документ Halide and ammonia palladium-copper complexes supported on modified tripoli in the reaction of carbon monoxide oxidation(2017) Rakitskaya, Tatiana L.; Golubchik, Khrystyna Olehivna; Kiose, Tetiana O.; Volkova, V. Y.; Кіосе, Тетяна Олександрівна; Киосе, Татьяна Александровна; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна ЛеонидовнаThe influence o: both an order of reactant mixing and their concentrations in the impregnating solution was investigated in detail. The investigation of all samples by X-ray diffraction, FT-IR spectroscopy, and thermal gravimetry allowed to assume the mechanism of formation of surface palladium-copper complexes.Документ Nanostructured polyphase catalysts based on the solid component of welding aerosol for ozone decomposition(2015) Rakitskaya, Tatiana L.; Truba, Hanna M.; Ennan, Alim-Abdul A.; Kiro, S. A.; Oprya, M. V.; Volkova, V. Y.; Ракитська, Тетяна Леонідівна; Труба, Ганна МиколаївнаThe solid component of welding aerosol (SCWA) is the airdispersed particulate formed out of the welding arc in consequence of the oxidation and condensation of vapors of components of electrode coatings, welding fluxes, and metals.Документ Some features of Pd(II) and Cu(II) adsorption with bentonites and activity of bentonite based catalysts in the reaction of carbon monoxide oxidation(2016) Rakitskaya, Tatiana L.; Vasylechko, V. O.; Kiose, Tetiana O.; Dzhyga, Ganna M.; Gryshchouk, Galyna V.; Volkova, V. Y.; Джига, Ганна Михайлівна; Джига, Анна Михайловна; Кіосе, Тетяна Олександрівна; Киосе, Татьяна Александровна; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна ЛеонидовнаFor the first time, Ukrainian natural bentonites are used as supports for anchoring Pd(II) and Cu(II) complexes. Depending on the bentonite origin, such supported metal complexes have different catalytic properties in the reaction o f carbon monoxide oxidation. Bentonites, similarly to other natural sorbents, are selective with respect to metal ions: the bentonite origin affects Cu(II) position in the selectivity orders. However, there are no data concerning adsorption o f Pd(II) and also Cu(II) and Pd(II) when they are simultaneously present in aqueous solution used for bentonite impregnation.Документ Structural-adsorption characteristics of natural and аcid-modified clinoptilolite(2016) Kiose, Tetiana O.; Golubchik, Khrystyna Olehivna; Rakitskaya, Tatiana L.; Dlubovskyi, Ruslan Mykhailovych; Kara, A. L.; Volkova, V. Y.; Кіосе, Тетяна Олександрівна; Киосе, Татьяна Александровна; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна ЛеонидовнаNatural clinoptilolite (N-CLI) is a polyphase mineral containing clinoptilolite, -quartz, mordenite, and hematite at certain ratios. We use clinoptilolite in its acid-modified forms (H-CLIs) as a support for Pd(II)-Cu(II) complexes (Pd-Cu/Н-CLIs) characterized by catalytic properties in the reaction of CO oxidation. N-CLI used in the study was provided from Sokirnitskoye deposit (Trans-Carpathian region). (0.25-3)Н-CLI-0.5H-CLI samples were prepared by N-CLI boiling for 0.5 h in nitric acid solution at its concentrations ranged from 0.25 to 3 M. Since water molecules directly participate in the formation of Pd(II)-Cu(II) surface complexes, we investigated ad/desorption of water vapor into/from N-CLI, (0.25-3)Н-CLI-0.5, and Pd-Cu/Н-CLIs using well-known McBain gravimetric method.Документ Structural-adsorption parameters of natural and modified tripoli(2017) Kiose, Tetiana O.; Rakitskaya, Tatiana L.; Golubchik, Khrystyna Olehivna; Kara, A. L.; Volkova, V. Y.; Кіосе, Тетяна Олександрівна; Киосе, Татьяна Александровна; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна ЛеонидовнаNatural tripoli (N-Tr) is a polyphase mineral containing (in a certain ratio) a-SO2 ; tridymite, p-cristobalite, and a-cristobalite as well as some products of clay decomposition We are tripoli modified by different ways as a support for anchoring Pd(II) and Cu(II) complexes/ The compositions thus obtained show exellent catalytic properties in the reaction of carbon monoxide oxidation with air oxygen.Документ The influence of concentration of nitric acid used in clinoptilolite modification on the activity of clinoptilolite based palladium-copper catalysts in the reaction of carbon monoxide oxidation(2016) Rakitskaya, Tatiana L.; Kiose, Tetiana O.; Golubchik, Khrystyna Olehivna; Volkova, V. Y.; Кіосе, Тетяна Олександрівна; Киосе, Татьяна Александровна; Ракитская, Татьяна Леонидовна; Ракитська, Тетяна ЛеонідівнаThe activity of supported palladium-copper catalysts in the reaction o f low-temperature carbon monoxide oxidation can be controlled by varying Pd(II) and Cu(II) precursors, ligands (L = СГ, Br~), Pd(II);Cu(II):L ratios, and structure-adsorption and physicochemical properties o f supports. The latter can be changed by acid-thermal modification o f natural sorbents often used as the supports.Документ Water vapor adsorption by dispersed manganese dioxides(2017) Truba, Alla S.; Rakitskaya, Tatiana L.; Nahaievska, Anna V.; Volkova, V. Y.; Ракитська, Тетяна Леонідівна; Ракитская, Татьяна Леонидовна; Труба, Алла Сергіївна; Труба, Алла СергеевнаAn adsorption capacity towards water vapor is one of the factors influencing catalytic properties of metal oxide compositions. samples: (i) commercial electrolytic manganese dioxide (IS-Mn) and prepared by us via different procedures, i/е/ (ii) by reducing of permanganates with Mn2+ ion (IIS-Mn) and (iii) by melting of KNO3 and MnS0 4 together (IIIS-Mn).Документ Water vapor adsorption by nanostructured polyphase compositions based on the solid component of welding aerosol(2017) Rakitskaya, Tatiana L.; Truba, Hanna M.; Ennan, Alim-Abdul A.; Dlubovskyi, Ruslan Mykhailovych; Volkova, V. Y.; Ракитська, Тетяна Леонідівна; Труба, Ганна МиколаївнаThe main harmful factor in welding and related productions is welding aerosol (WA). The solid component of welding aerosol (SCWA) is an air dispersed particulate formed out of the welding arc in consequence of the oxidation and condensation of vapours of components forming electrode coatings and welding fluxes, and also metals themselves. Taking into consideration volumes and techniques of welding and related productions as well as materials used for them, it is important not only to decrease toxic effect of SCWAs on the environment and operating personnel but also to recycle solid wastes in order to obtain industrial and household products.