Preparation of highly dispersed Ni1-xPdx alloys for the decomposition of chlorinated hydrocarbons

Rudneva, Yuliya; Shubin, Yu. V.; Plyusnin, P. E.; Bauman, Yury I.; Mishakov, Ilya V.; Коренев, С. В.; Vedyagin, Aleksey A.

doi:10.1016/j.jallcom.2018.12.207

Cited by 26 publications

(10 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This results in the formation of a mixture consisting of a complex Cu(Fe) + Fe cluster nanocomposite and α-Fe phase “invisible” due to X-ray fluorescence. The rate of alloying in the present study was found to be faster compared with low-energy milling reported previously [ 20 , 21 ].…”

Section: Resultssupporting

confidence: 50%

“…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%

See 1 more Smart Citation

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

et al. 2022

View full text Add to dashboard Cite

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).

show abstract

Section: Resultssupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The following commercial reagents were used as received: trichloroethylene (C 2 HCl 3 , chemically pure, Component-Reactiv, Moscow, Russia); acetonitrile (CH 3 CN, chemically pure, Component-Reactiv, Moscow, Russia); PdCl 2 (pure, Aurat, Moscow, Russia); NaBH 4 (purity of 98 wt%, Chemical Line, Saint Petersburg, Russia); 1,2-dichlorobenzene (C 6 H 4 Cl 2 , purity of 99 wt%, Sigma-Aldrich, St. Louis, MO, USA); KOH (analytically pure, Reakhim, Moscow, Russia); and 2-propanol (CH 3 CH(OH)CH 3 , high purity grade, Baza No.1 Khimreactivov, Staraya Kupavna, Russia). Microdispersed Ni-catalyst was synthesized as described elsewhere [ 37 ].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Chlorine- and Nitrogen-Containing Carbon Nanofibers for Water Purification from Chloroaromatic Compounds

et al. 2022

Self Cite

View full text Add to dashboard Cite

Chlorine- and nitrogen-containing carbon nanofibers (CNFs) were obtained by combined catalytic pyrolysis of trichloroethylene (C2HCl3) and acetonitrile (CH3CN). Their efficiency in the adsorption of 1,2-dichlorobenzene (1,2-DCB) from water has been studied. The synthesis of CNFs was carried out over self-dispersing nickel catalyst at 600 °C. The produced CNFs possess a well-defined segmented structure, high specific surface area (~300 m2/g) and high porosity (0.5–0.7 cm3/g). The addition of CH3CN into the reaction mixture allows the introduction of nitrogen into the CNF structure and increases the volume of mesopores. As a result, the capacity of CNF towards adsorption of 1,2-DCB from its aqueous solution increased from 0.41 to 0.57 cm3/g. Regardless of the presence of N, the CNF samples exhibited a degree of 1,2-DCB adsorption from water–organic emulsion exceeding 90%. The adsorption process was shown to be well described by the Dubinin–Astakhov equation. The regeneration of the used CNF adsorbent through liquid-phase hydrodechlorination was also investigated. For this purpose, Pd nanoparticles (1.5 wt%) were deposited on the CNF surface to form the adsorbent with catalytic function. The presence of palladium was found to have a slight effect on the adsorption capacity of CNF. Further regeneration of the adsorbent-catalyst via hydrodechlorination of adsorbed 1,2-DCB was completed within 1 h with 100% conversion. The repeated use of regenerated adsorbent-catalysts for purification of solutions after the first cycle of adsorption ensures almost complete removal of 1,2-DCB.

show abstract

“…In the present work, 1,2-dichloroethane (DCE) was used as a representative of the mentioned class of organochlorine compounds. The Ni-Pd alloy with palladium content of 5 wt% was chosen as a catalyst providing high enough efficiency [23,41]. Three different reactor types were examined.…”

Section: Introductionmentioning

confidence: 99%

Scaling up the Process of Catalytic Decomposition of Chlorinated Hydrocarbons with the Formation of Carbon Nanostructures

et al. 2022

Self Cite

View full text Add to dashboard Cite

Catalytic processing of organochlorine wastes is considered an eco-friendly technology. Moreover, it allows us to obtain a value-added product—nanostructured carbon materials. However, the realization of this process is complicated by the aggressiveness of the reaction medium due to the presence of active chlorine species. The present research is focused on the characteristics of the carbon product obtained over the Ni-Pd catalyst containing 5 wt% of palladium in various quartz reactors: from a lab-scale reactor equipped with McBain balance to scaled-up reactors producing hundreds of grams. 1,2-dichloroethane was used as a model chlorine-substituted organic compound. The characterization of the materials was performed using scanning and transmission electron microscopies, Raman spectroscopy, and low-temperature nitrogen adsorption. Depending on the reactor type, the carbon yield varied from 14.0 to 24.2 g/g(cat). The resulting carbon nanofibers possess a segmented structure with disordered packaging of the graphene layers. It is shown that the carbon deposits are also different in density, structure, and morphology, depending on the type of reactor. Thus, the specific surface area changed from 405 to 262 and 286 m2/g for the products from reactor #1, #2, and #3, correspondingly. The main condition providing the growth of a fluffy carbon product is found to be its ability to grow in any direction. If the reactor walls limit the carbon growing process, the carbon product is represented by very dense fibers that can finally crack the reactor.

show abstract

Preparation of highly dispersed Ni1-xPdx alloys for the decomposition of chlorinated hydrocarbons

Cited by 26 publications

References 28 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 of Chlorine- and Nitrogen-Containing Carbon Nanofibers for Water Purification from Chloroaromatic Compounds

Scaling up the Process of Catalytic Decomposition of Chlorinated Hydrocarbons with the Formation of Carbon Nanostructures

Contact Info

Product

Resources

About