Військовий інститут танкових військ НТУ "ХПІ"

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Cobalt and manganese oxide catalytic systems on valve metals in ecotechnologies
(Kyiv National University of Technologies and Design, 2017) Karakurkchi, A. V.; Sakhnenko, M. D.; Ved, M. V.; Gorohivskiy, A. S.; Galak, O.; Menshov, S.; Matykin, O.
The paper discusses the preparation of cobalt and manganese oxide catalytic systems on valve metals (aluminum and titanium alloys) for eco-technologies. Oxide catalysts with d-metals based on aluminum are widely used for reduce the toxic gases emission from internal combustion engines. Catalysts based on Titania doped with transition metal oxides are also widely used in the heterogeneous and especially photo-catalysis. The higher catalytic properties in this case are demonstrated by the nano-structured oxide systems with developed surface both on aluminum and titanium alloys. From the point of view of the application convenience, better technological forms of a catalyst are the thin-film oxide coatings, formed directly on the metal substrate by the method of plasma-electrolytic oxidizing. It is considered the features of the conversion coatings formation on aluminum and titanium alloys by plasma electrolytic oxidation in alkaline electrolytes. The effect both the concentration and ratio of the electrolyte components and processing conditions on the composition and the morphology of the surface layers is studied. The difference in the plasma oxidation parameters of aluminum and titanium alloys is attributed with the various specific electric resistance of matrix metal as well as the alloying elements oxides. The oxides’ composition influence on the surface relief and their properties is investigated. The factors influenced on the catalytic properties of single and mixed oxide systems are established and the prospects for their use in technology of neutralization of toxic substances are discussed.
Increasing the efficiency of intra-cylinder catalysis in diesel engines
(Украинский государственный химико-технологический университет, 2017) Parsadanov, I. V.; Sakhnenko, N. D.; Ved, M. V.; Rykova, I. V.; Khyzhniak, V. A.; Karakurkchi, A. V.; Gorokhivskiy, A. S.
The data of research done to systemize and choose scientific fields and search for the rational ways of an increase in the efficiency of intra-cylinder catalysis in diesel engines have been given. The use of base metal oxides and composite oxides of transition metals as the coatings for the piston combustion chamber has been substantiated. This allows us to control chemical reaction rates and reduce the formation of toxic substances. When selecting the scientific fields and rational practical ways of an increase in the efficiency of intra-cylinder catalysis in diesel engines chemical, physical and technological factors were taken into consideration. The formation of catalytic coatings based on the oxides of transition metals (Mn, Co) was provided using the plasma-electrolytic oxidizing on the Al25 alloy. These included both individual manganese and cobalt oxides and the mixed oxides of both metals. The investigation of catalytic coatings of the combustion chamber in the diesel engine piston on the basis of manganese and cobalt oxides and mixed oxides enabled the establishment of a maximum catalytic effect when cobalt oxides were used. The prototype diesel test data showed that the fuel rate in this case is decreased by 4 to 6 %, NOx emissions were reduced by 14 to 15 % and carbon oxide emissions were reduced by 20 through 25 %.

Військовий інститут танкових військ НТУ "ХПІ"

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