Titanium-supported nickel-copper oxide catalysts for oxidation of carbon(II) oxide

Vasileva, Marina; Руднев, В. С.; Sklyarenko, O. E.; Tyrina, L. M.; Kondrikov, N. B.

doi:10.1134/s1070363210080037

Cited by 23 publications

(11 citation statements)

References 7 publications

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“…For example, impregnation in solu tions with subsequent annealing or a combination of the PEO and extraction-pyrolytic methods are com monly used to modify the surfaces of preformed oxide layers with catalytically active components [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Magnetic characteristics of iron-modified oxide layers on titanium

Руднев

Adigamova

Lukiyanchuk

et al. 2014

Russ. J. Phys. Chem.

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Iron modified TiO 2 coatings on titanium exhibiting ferromagnetic properties are formed by com bining plasma electrolytic oxidation (PEO) and impregnation with subsequent annealing. It is found that iron is contained in the composition of dispersed particles with sizes of 1-10 µm distributed over the surface of the coatings. It is shown that the coercive force of the coating on titanium samples is 20-70 Oe. The composition, structure, and magnetic properties of the samples with coatings prepared via direct PEO and by combining PEO and impregnation are compared. It is concluded that impregnation and annealing procedures can be used to impart ferromagnetic properties to PEO coatings with different compositions, e.g., protective coat ings and coatings applied in catalysis or medicine.

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Section: Introductionmentioning

confidence: 99%

Magnetic characteristics of iron-modified oxide layers on titanium

Руднев

Adigamova

Lukiyanchuk

et al. 2014

Russ. J. Phys. Chem.

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“…Recently, transition metal oxides, including those deposited on various substrates (silica gel, aluminum and titanium oxides, metals, and alloys), have been extensively applied as heterogeneous catalysts in chemical and oil processing industry as well as in cleaning industrial gaseous wastes and automobile transport Plasma electrolytic oxidation (PEO) is one of unconventional and promising methods used for fabrication of oxide catalysts on metal substrates [6][7][8][9][10][11][12][13][14][15][16]. The PEO method, which comprises the buildup of anodic oxide layers on metals and alloys in the near-anode area of spark and microarc electric discharges, enables one to obtain oxide layers consisting not only of the treated metal oxide (as during conventional anodization), but also of electrolyte components [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…To deposit the catalytically active substance by the impregnation/annealing method, it appears efficient to use PEO layers formed in the silicate electrolyte (Na 2 SiO 3 ) having relatively high water absorption [9], specific surface area, and porosity [20]. At the same time, the cross-section structure of coatings on titanium obtained in the silicate electrolyte has been studied insufficiently yet.…”

Section: Introductionmentioning

confidence: 99%

“…The PEO method, which comprises the buildup of anodic oxide layers on metals and alloys in the near-anode area of spark and microarc electric discharges, enables one to obtain oxide layers consisting not only of the treated metal oxide (as during conventional anodization), but also of electrolyte components [17][18][19]. In many cases, PEO layers are characterized by developed and defect surface and can be efficiently impregnated in aqueous salt solutions [6][7][8][9]. In the process of catalysts fabrication through combination of the PEO method with impregnation and annealing, the PEO layer serves as an oxide one or as the secondary substrate (here, metal or alloy constitute the primary substrate).…”

Section: Introductionmentioning

confidence: 99%

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Formation, composition, structure, and catalytic activity in CO oxidation of SiO2+ TiO2/Ti composite before and after modification by MnOx or CoOx

Vasilyeva

Руднев

Ustinov

et al. 2015

Surface and Coatings Technology

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“…In addition, it was shown that the coatings formed in this electrolyte by PEO are convenient for modifi cation by impregnation [7].…”

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Deposition of cobalt-containing films on titanium by plasma electrolytic oxidation

et al. 2012

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The possibility of forming Co-containing coatings on titanium by plasma electrolytic oxidation and by a combination of oxidation and impregnation methods using an aqueous solution of sodium silicate as the base electrolyte was examined. Comparative analysis of the composition and structure of the systems obtained and of their activity in oxidation of СО to СО 2 was performed.For catalysis, in particular, for photo-and electrocatalysis, of much interest are layers on titanium that contain, along with TiO 2 , oxides of transition and rareearth metals, including cobalt oxides [1]. At the same time, coatings with cobalt and cobalt oxides can exhibit magnetic properties. For example, incorporation of cobalt nanoparticles into oxide layers on titanium imparts ferromagnetic properties to the surface oxide structures [2].One of methods for preparing cobalt-containing oxide coatings on the surface of titanium specimens is plasma electrolytic oxidation (PEO) in aqueous electrolytes [2][3][4][5]. For example, X-ray amorphous coatings containing up to 45 wt % cobalt depending on the forming conditions were prepared by plasma electrolytic treatment of a titanium alloy in an aqueous electrolyte containing salts of phosphoric, boric, and tungstic acids (PBW) and up to 30 g l -1 Co(CH 3 COO) 2 [3]. After annealing in air at 800°С, the CoO, Co 2 O 3 , Co 3 O 4 , CoWO 4 , Na 2 TiO 3 , and Na 3 Co 9 (PO 4 ) 7 phases crystallized in the coatings. In [4,5], the coatings were formed from electrolytes with Со 2+ polyphosphate complexes. On titanium and aluminum, layers containing from 18 to 27 wt % cobalt and crystalline phases of Co(II)Co(III)Ti(PO 4 ) 3 , Co 2 O 3 , and TiO 2 (on Ti) and of Co 2 O 3 , CoAl 2 O 4 , and AlPO 4 (on Al) were obtained. However, the functional properties of the oxide systems obtained were not studied.One of the most widely used electrolytes for PEO of valve metals and alloys is an aqueous solution of sodium silicate [6]. In addition, it was shown that the coatings formed in this electrolyte by PEO are convenient for modifi cation by impregnation [7].This study was aimed to form Co-containing coatings on titanium by PEO alone and in combination with impregnation, using an aqueous solution of sodium silicate as the base electrolyte, and to compare the composition and structure of the systems obtained and their activity in the oxidation of СО to СО 2 . EXPERIMENTAL Plasma electrolytic oxidation experiments were performed with plates of VT1-0 grade titanium of sizes 0.5 × 2.5 × 0.1 and 2.2 × 2.2 × 0.1 cm. The specimens were subjected to mechanical polishing and chemical etching in the HF : HNO 3 = 1 : 3 acid system at 60-80°С for 2-3 s, after which they were washed with distilled water and dried in air.As power source we used a TER4-63/460N-2-2-UKhL4 thyristor aggregate with the unipolar pulse current. The coatings were formed under galvanostatic condi-

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Titanium-supported nickel-copper oxide catalysts for oxidation of carbon(II) oxide

Cited by 23 publications

References 7 publications

Magnetic characteristics of iron-modified oxide layers on titanium

Magnetic characteristics of iron-modified oxide layers on titanium

Formation, composition, structure, and catalytic activity in CO oxidation of SiO2+ TiO2/Ti composite before and after modification by MnOx or CoOx

Deposition of cobalt-containing films on titanium by plasma electrolytic oxidation

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