W-containing oxide layers obtained on aluminum and titanium by PEO as catalysts in thiophene oxidation

Руднев, В. С.; Lukiyanchuk, I. V.; Vasilyeva, M. S.; Morozova, V. P.; Zelikman, V. M.; Tarkhanova, I. G.

doi:10.1016/j.apsusc.2017.06.071

Cited by 18 publications

(8 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[18] Secondly, we earlier observed the formation of sulfuric acid during oxidation of thiophene on tungsten-containing catalysts. [19] As a result, the corrosion medium is formed, which may decompose the catalyst. [20] Therefore, the selected process allows testing both the activity and stability of catalysts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

et al. 2020

View full text Add to dashboard Cite

One‐stage size‐selective method of laser electrodispersion (LED) was used to produce nanostructured NiPd, NiMo and NiW coatings on the surface of alumina, HOPG and Sibunit for the catalytic application. The deposition of nanoparticles produced by LED of bimetallic targets from alloyed or pressed metal powders provides the uniform distribution of both metals on the outer support surface; the metal ratio is similar to that in the original target. The catalytic behaviour of produced “core‐shell” catalysts in comparison with monometallic analogues was tested in two model reactions: the CO oxidation with oxygen on NiPd catalysts supported on alumina and Sibunit; and thiophene oxidation with hydrogen peroxide on NiMo and NiW alumina supported catalysts. Novel LED bimetallic catalysts with extremely low metal content (0.005 %) were superior in terms of activity and stability to monometallic ones and the catalysts obtained by “wet” chemistry methods. Improved catalytic properties of bimetallic LED catalysts are related to the high density of single nanoparticles and the formation of active metal‐oxide interfaces on the support surface.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Firstly, thiophene is the most resistant to oxidation among thiophene derivatives contained in fuels . Secondly, we earlier observed the formation of sulfuric acid during oxidation of thiophene on tungsten‐containing catalysts . As a result, the corrosion medium is formed, which may decompose the catalyst .…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The bubble would collapse with the change in the internal pressure in the electrolyte, forming a great jet stream. The micro-holes were in a high-temperature and high-pressure environment, and some solute ions were carried into the interface between the electrolyte and the coating, promoting the transformation of the solute ions into their oxide due to the quenching effect by solution [34], and then, the molten titanium oxide was solidified immediately and metastable oxide phases formed, shown as reactions (5) and (6). This process is illustrated in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Micro-arc oxidation (MAO), also called plasma electrolytic oxidation (PEO), has been well utilized to improve the properties of metallic materials because it is a simple and environmental-friendly process, and the resultant coatings exhibit superior properties like ceramics and are metallurgically bonded with the substrates [3][4][5][6][7][8][9]. As a result, the corrosion resistance and wear resistance of aluminum alloys can be significantly improved [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of K2TiO(C2O4)2 Addition in Electrolyte on the Microstructure and Tribological Behavior of Micro-Arc Oxidation Coatings on Aluminum Alloy

Wang

Yang

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

Micro-arc oxidation (MAO) coatings with different concentrations of K 2 TiO(C 2 O 4) 2 in the sodium silicate base electrolyte were prepared on 6061 aluminum alloy with the aim of promoting a better understanding of the formation mechanisms and tribological behaviors of the coatings. Scanning electron microscopy (SEM) assisted with energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and friction test were employed to characterize the MAO processes and microstructure of the resultant coatings. Results showed that the composition and microstructure of the coatings were significantly affected by the addition of K 2 TiO(C 2 O 4) 2. A sealing microstructure of MAO coating was obtained with the addition of K 2 TiO(C 2 O 4) 2. Ti element from K 2 TiO(C 2 O 4) 2 was only absorbed into the defects of micropores under surface energy in the early stage, while in the later stage, Ti element was predominant in the micropores and distributed on the coatings under plasma discharge to form TiO 2. It was demonstrated that Ti and Si elements from the electrolyte could interact with each other during the MAO process and the interaction mechanism was systematically analyzed. Wear resistance of the MAO coatings with K 2 TiO(C 2 O 4) 2 addition was significantly improved compared with that of the MAO coatings without K 2 TiO(C 2 O 4) 2 addition.

show abstract

“…Some of them show the process of in situ doping such as cerium or phosphate [13], tungsten [14], or even nanoplatelets [15]. Other works describe nanoformation on the coating surface, which affects its final properties [16,17].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Oxide Coating Synthesized on an Aluminum Alloy by Plasma Electrolytic Oxidation in Molten Salt

et al. 2017

View full text Add to dashboard Cite

Plasma electrolytic oxidation (PEO) is a surface treatment process for obtaining oxide coatings with a high performance on valve metals. PEO is mostly performed in an aqueous solution electrolyte that limits the size of treated parts due to the fact that the system is heated. Therefore, the coating of large surfaces cannot be synthesized in an aqueous electrolyte. In the current work, an alternative approach of PEO treatment, whereby an aluminum 1050 alloy in nitrate molten salt at a temperature of 280 • C is applied, was investigated. The microstructure, phase and chemical compositions, and micro-hardness were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and micro-hardness tests. The obtained results show that formed coating contains from two sub-layers: one is the outer sub-layer of the α-Al 2 O 3 phase and the second is its inner sub-layer. It was found that the formed coating was free of any contaminants originating from the electrolyte and had no cracks or pores, which are usually present in coatings formed by PEO treatment in an aqueous solution electrolyte.

show abstract

W-containing oxide layers obtained on aluminum and titanium by PEO as catalysts in thiophene oxidation

Cited by 18 publications

References 56 publications

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

Effect of K2TiO(C2O4)2 Addition in Electrolyte on the Microstructure and Tribological Behavior of Micro-Arc Oxidation Coatings on Aluminum Alloy

An Investigation of Oxide Coating Synthesized on an Aluminum Alloy by Plasma Electrolytic Oxidation in Molten Salt

Contact Info

Product

Resources

About