Plasma electrolytic oxide coatings on valve metals and their activity in CO oxidation

Lukiyanchuk, I. V.; Руднев, В. С.; Tyrina, L. M.; Chernykh, I. V.

doi:10.1016/j.apsusc.2014.03.040

Cited by 23 publications

(14 citation statements)

References 34 publications

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“…This is due to variability of manganese oxidation numbers and more developed and a rough surface of mixed manganese containing oxide. Obtained results are in accordance with the data [15][16][17] and advantage of this work is that observed in this paper coatings do not need additional impregnation. Thus above data confirm the efficiency of materials as catalysts for the CO conversion and gaseous wastes neutralization.…”

Section: Resultssupporting

confidence: 90%

“…However, the increase in the catalytic activity of above materials in CO oxidation reaction was achieved by additional impregnation followed by annealing. In [17] catalytic materials on titanium and aluminum doped with transition metal oxides (Mn, Fe, Co, Ni) were obtained in one stage by the PEO method, and also in two stages combining the PEO treatment, followed by impregnation in solutions. The need for additional technological operations was due to the low content of dopants and the uneven distribution of catalytic components in the surface layers.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Research on the improvement of mixed titania and Co(Mn) oxide nano-composite coatings

Yar-Mukhamedova

Ved

Karakurkchi

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The structure and the properties of the oxide films formed on titanium in the diphosphate based electrolytes by means of plasma electrolytic oxidizing at direct current density of 2-2.5 A· dm −2 have been studied. Oxide layers of different composition and content of alloying elements were obtained by modification of electrolytes and variation in current density. The interelectrode voltage during PEO, chemical and phase composition, topography and microstructure of the formed layers depend on the electrolyte composition and applied current density. The spark-discharge regime was shown to be reached at inter-electrode voltage 100 to 130 V depending on the composition of electrolyte. The effect of chemical composition and surface morphology formed mixed oxide films on the corrosion resistance and catalytic activity has been discussed. IntroductionTitanium is the most common oxide in heterogeneous catalysis and photo-catalysis for the purification gas and liquid media from toxicant [1,2]. This fact is attributed to the fairly high chemical stability under different operating conditions, no toxicity, and relatively low cost of this material. At the same time it was found that, in most cases, catalyst materials based on mixed two or three component oxide systems exhibit high activity and selectivity not only in heterogeneous red-ox reactions [3-5] but also in photo-catalytic ones [6][7][8]. Synthesis of nano-composite catalytic disperse systems based on titania is carried out by various methods, including sol-gel processes [6,9,10].The formation different kind of oxide layers has been achieved by the anodic oxidation and plasma surface treatment in the sparking regime (plasma electrolytic oxidizing PEO) seems to be the very promising since it does not need the sophisticated facilities, allows to form various types of titania and to incorporate different species into the layer by modification of electrochemical parameters and of electrolyte chemistry [11][12][13][14].Titania layers containing manganese oxides obtained by PEO in acetate-borate electrolyte was noted to be catalytic active in CO conversion to CO 2 [15]. Cobalt-containing oxide coatings on titanium are obtained from a silicate electrolyte with cobalt acetate addition [16]. However, the increase in the catalytic activity of above materials in CO oxidation reaction was achieved by additional impregnation followed by annealing. In [17] catalytic materials on titanium and aluminum doped with transition metal oxides (Mn, Fe, Co, Ni) were obtained in one stage by the PEO method,

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Research on the improvement of mixed titania and Co(Mn) oxide nano-composite coatings

Yar-Mukhamedova

Ved

Karakurkchi

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In article [25], catalytic materials on titanium and aluminum were received over one stage by the method of PEO, as well as over two stages by combining the PEO-modification of base metal with subsequent impregnation in the solutions of salts of catalytically active components. By employing such a technique, the authors obtained oxide-metallic systems doped with the oxides of transition metals (Mn, Fe, Co, Ni), which were tested in the model reaction of CO oxidation.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Application of oxide-metallic catalysts on valve metals for ecological catalysis

Karakurkchi

Сахненко

Ved

et al. 2017

EEJET

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“…It is found, that depending on the processing conditions, it is possible to carry out the electrolytic-plasma oxidation [3][4][5][6][7][8][9], polishing of the surface of aluminum or deburring. It should be noted that in some works, where DC supply voltage is used the electrolytic-plasma oxidation is named as microarc oxidation [3][4][5][6][7] that in terms of electrical discharges properties is fundamentally wrong [2].…”

Section: Introductionmentioning

confidence: 99%

Aluminum Treatment in the Electrolytic Plasma During the Anodic Process

Duradji¹,

Капуткин²,

Duradji³

2017

JESTR

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Electrolytic-plasma processes are new highly efficient and environment friendly processing techniques of metals and alloys; they could be applied for polishing and cleaning of the metal surfaces, for thermal and chemical-thermal treatment. The present work is related to the study of modes, established on the active electrode made from aluminum during the anodic process and using of these modes for polishing of its surface, and also for the synchronous polishing of the anode surface and coating removing from the surface of the copper-plated cathode. The copper content and surface roughness of the metal before and after treatment were evaluated by means of the profilometry and energy-dispersive Xray analysis (EDAX). The composition, microstructure and morphology of the copper coating removed from the cathode surface have been studied depending on treatment parameters. The results show that electrolytic-plasma processes can be effectively used for polishing of the surface of aluminum, simultaneous polishing of the aluminum anode and removing of the copper coating from the cathode.

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Plasma electrolytic oxide coatings on valve metals and their activity in CO oxidation

Cited by 23 publications

References 34 publications

Research on the improvement of mixed titania and Co(Mn) oxide nano-composite coatings

Research on the improvement of mixed titania and Co(Mn) oxide nano-composite coatings

Application of oxide-metallic catalysts on valve metals for ecological catalysis

Aluminum Treatment in the Electrolytic Plasma During the Anodic Process

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