Activation of the Surface of Polymetallic Carriers by the Formation of Intermediate Intermetallic Phases

Borshch, V. N.; Zhuk, S. Ya.; Сачкова, Н. В.

doi:10.1134/s0023158418030047

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Most studies on Al–Cu–Fe alloys were aimed at the synthesis of Al 63-70 Cu 20-25 Fe 10-12 quasicrystals of icosahedral structure [ 3 , 4 , 5 , 6 , 7 ] for a variety of applications: antimicrobial agents [ 8 ], decomposition of hazardous materials [ 9 ], carbon nanotube growth catalysts [ 10 ], magnetic materials [ 4 , 11 ], anodes in lithium batteries [ 12 ], fillers with ultralow wear [ 13 ], and catalysts in steam reforming of methanol [ 14 , 15 ]. Moreover, nanostructured powder alloys are becoming popular in traditional heterogeneous catalysis [ 16 , 17 ], e.g., in hydrogenation reactions of CO (CO 2 ) [ 18 ], synthesis of carbon fibers [ 19 ], decomposition of chlorine-containing hydrocarbons [ 20 , 21 ], decomposition of polymers [ 22 ], and in steam and dry reforming [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned earlier, for catalysis, the specific surface area must be high, which implies that the size of the powder particles and nano-aggregates must be small, which can be obtained by processes, such as self-propagating high-temperature synthesis [ 16 , 17 , 18 ]. However, even a short high-temperature exposure can be detrimental, leading to aggregate coarsening, which requires additional processing to increase the specific surface area of the powders [ 17 ]. Another possibility to produce fine powders of multi-component alloys is through mechanical alloying [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

et al. 2022

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In the present work, complex powder alloys containing spinel as a minor phase were produced by mechanical alloying in a high-energy planetary ball mill from a 33Al–45Cu–22Fe (at.%) powder blend. These alloys show characteristics suitable for the synthesis of promising catalysts. The alloying was conducted in two stages: at the first stage, a Cu+Fe powder mixture was ball-milled for 90 min; at the second stage, Al was added, and the milling process was continued for another 24 min. The main products of mechanical alloying formed at each stage were studied using X-ray diffraction phase analysis, Mössbauer spectroscopy, transmission electron microscopy, and energy-dispersive spectroscopy. At the end of the first stage, crystalline iron was not found. The main product of the first stage was a metastable Cu(Fe) solid solution with a face-centered cubic structure. At the second stage, the Cu(Fe) solid solution transformed to Cu(Al), several Fe-containing amorphous phases, and a spinel phase. The products of the two-stage process were different from those of the single-stage mechanical alloying of the ternary elemental powder mixture; the formation of undesirable intermediate phases was avoided, which ensured excellent composition uniformity. A sequence of solid-state reactions occurring during mechanical alloying was proposed. Mesopores and a spinel phase were the features of the two-stage milled material (both are desirable for the target catalyst).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

et al. 2022

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Synthesis and investigation of highly dispersed active phases of intermetallic and supported SHS-catalysts

Borshch

Pugacheva

Zhuk

et al. 2019

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

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In the present study, the active phases (AP) of an Fe–Ni–Co–Mn catalyst produced from SHS-intermetallics (a), a catalyst prepared via formation an intermetallic layer on a mesh surface of chromium-nickel stainless steel (b), and of a Co–Mn catalyst prepared via SHS on silica gel support (c), were isolated and characterized by SEM and XRD. The catalysts studied were highly active in the process of deep oxidation and catalysts (b) and (c) were highly active in the process of CO2 methanation as well. All AP had oxo-metallic composition and were formed from nanoscale components, but if the structure of these components for catalyst (a) was the same as on the surface of the catalyst, the structures of AP components for catalyst (b) significantly differed from the surface structures. In addition, AP sediment grain nanostructures of catalyst (c) differed from those of catalysts (a) and (b).

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Activation of the Surface of Polymetallic Carriers by the Formation of Intermediate Intermetallic Phases

Cited by 2 publications

References 15 publications

Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

Elimination of Composition Segregation in 33Al–45Cu–22Fe (at.%) Powder by Two-Stage High-Energy Mechanical Alloying

Synthesis and investigation of highly dispersed active phases of intermetallic and supported SHS-catalysts

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