Oxide coatings modified with transition and rare-earth metals on aluminum and their activity in CO oxidation

Tyrina, L. M.; Руднев, В. С.; Ustinov, A. Yu.; Lukiyanchuk, I. V.; Недозоров, П. М.; Chernykh, I. V.; Dmitrieva, E. E.

doi:10.1134/s2070205114040170

Cited by 6 publications

(8 citation statements)

References 23 publications

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“…% and lower concentration of impurities comparing with Al│Al 2 O 3 coating synthesized in pure diphosphate electrolyte (Fig. 1 a), which is essential for the high catalytic properties of the material [3]. Analysis of the composition of oxide systems indicates nonstoichiometric ratio of cobalt and oxygen which is favorable for the implementation of catalytic processes involving oxygen.…”

Section: Resultsmentioning

confidence: 93%

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Synthesis of Catalytic Cobalt-Containing Coatings on Alloy Al25 Surface by Plasma Electrolytic Oxidation

Ved¹,

Karakurkchi²,

Сахненко³

et al. 2017

Him. Fiz. Tehnol. Poverhni

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The study aims at the investigation of the influence of electrolyte composition and plasma electrolytic oxidation modes on the composition and morphology of a mixed aluminum and cobalt oxides at the AL25 alloy. Composition, morphology Environmental and technical problems accompanying the operation of internal combustion engines (ICE) are associated with the incomplete combustion of fuel and, respectively, the inevitable formation of toxic components (CO, NO x , and soot). One of the perspective ways to improve the performance of ICE can be the use of catalysis in situ in the combustion chamber [1]. Catalytic processes are characterized by lower activation energies and consequently temperatures of the fuel burning start as well as its higher completeness [2]. These lead to a decrease in the maximum pressure in the combustion chamber and, hence, in the severity of engine operation and to the minimization of emissions of hazardous substances with exhaust gases.The currently available hydrocarbon fuel combustion catalysts are divided into two groups: catalysts based on noble metals (most commonly Pd and Pt) and transition-metal oxides (Mn, Co, Fe, etc.), particularly those with a complex composition [3]. At high temperatures, significant advantages are shown by a family of catalysts based on d-metals, in particular, cobalt oxides, which exhibit thermal lability and high oxygen affinity [4]. Nonstoichiometric cobalt oxides not only provide the thermal stability of the catalysts but also lead to a significant improvement of its reactivity.In terms of rational designing and effective technology, it seems appropriate to deposit a catalytic layer directly on the surface of ICE pistons manufactured using AL25 alloys with an optimal combination of physico-mechanical and performance properties [5]. The most promising method for the formation of thin layers on aluminum alloys, in particular, silumins, is plasma electrolytic oxidation (PEO). This method provides the incorporation of catalytically active components into an alumina matrix owing to the implementation of both electrochemical and thermo-chemical reactions in high-energy modes [6,7]. However, it should

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Section: Resultsmentioning

confidence: 93%

“…), particularly those with a complex composition [3]. At high temperatures, significant advantages are shown by a family of catalysts based on d-metals, in particular, cobalt oxides, which exhibit thermal lability and high oxygen affinity [4].…”

mentioning

confidence: 99%

Synthesis of Catalytic Cobalt-Containing Coatings on Alloy Al25 Surface by Plasma Electrolytic Oxidation

Ved¹,

Karakurkchi²,

Сахненко³

et al. 2017

Him. Fiz. Tehnol. Poverhni

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“…As was shown by Boreskov [11,12], sequential impregnation enables one to obtain more active catalysts. This has also been shown to be true in the case of oxide catalysts on metallic sub strates obtained through a combination of the meth ods of plasma electrolytic oxidation (PEO) and impregnation followed by annealing [13,14]. In this case, PEO (electrochemical anodization of valve met als under conditions of electric and arc discharges) provides the creation of an oxide layer (secondary sub strate) from components of treated metal and electro lyte having good adhesion to metallic substrate on the metal surface.…”

Section: Introductionmentioning

confidence: 86%

“…As was established in [14], the sequential introduc tion of oxygen compounds of Ni(II), Cu(II), Mn(II), Co(II), and Ce(III) into plasma electrolytic oxide layers SiO 2 + Al 2 O 3 on D16 aluminum alloys by the method of impregnation followed by annealing was accompanied with gradual decrease of the tempera ture of half conversion of CO into СО 2 , i.e., with the increase of the catalytic activity of the formed catalysts ( Fig. 1).…”

Section: Introductionmentioning

confidence: 86%

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Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

Tyrina

Руднев

Lukiyanchuk

et al. 2015

Prot Met Phys Chem Surf

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Coatings on aluminum alloy containing one or several crystalline oxides of cobalt, copper, and cerium deposited in different sequences have been obtained by a combination of methods of plasma electro lytic oxidation and impregnation followed by annealing. It has been established that the composition of sur face layers and the catalytic activity of composites depend on the sequence of deposition of active components on the substrate. Cu 2+ , Cu + , Co 3+ , Ce 4+ , and Ce 3+ are present in the surface and subsurface layers. All the studied composites are characterized by catalytic activity in the reaction of oxidation of CO into CO 2 . Of the studied composites, the following are most active: Ce

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Recent Advances of Monolithic Metal Mesh‐Based Catalysts for CO Oxidation

Yang,

Li,

Liu

2024

ChemCatChem

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This review systematically evaluates the research and applications of metal mesh‐based catalysts for CO oxidation. CO is a hazardous gas that affects human health and the environment. Traditional cordierite‐based catalysts have drawbacks such as complex preparation, high costs, poor stability, and limited catalytic activity, necessitating exploration of alternative solutions. Monolithic metal mesh‐based catalysts, using metal substrates like Ti, Cu, Fe, FeCrAl, stainless steel, Al and Ni, could address these problems effectively. Generally, each metal mesh requires specific pretreatments to roughen surface and facilitate the loading of active species. Plasma electrolytic oxidation is particularly effective for Ti and Al mesh. This results in a monolithic metal mesh‐based catalyst with uniform surface distribution and fully exposed active species. The review also summarizes in‐situ preparation strategies for metal mesh‐based catalysts and their progress in CO oxidation. Finally, the development potential of metal mesh‐based catalysts is discussed, emphasizing the significant challenges and future prospects for industrial applications.

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Oxide coatings modified with transition and rare-earth metals on aluminum and their activity in CO oxidation

Cited by 6 publications

References 23 publications

Synthesis of Catalytic Cobalt-Containing Coatings on Alloy Al25 Surface by Plasma Electrolytic Oxidation

Synthesis of Catalytic Cobalt-Containing Coatings on Alloy Al25 Surface by Plasma Electrolytic Oxidation

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

Recent Advances of Monolithic Metal Mesh‐Based Catalysts for CO Oxidation

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