Nickel(0) nanoparticles supported on bare or coated cobalt ferrite as highly active, magnetically isolable and reusable catalyst for hydrolytic dehydrogenation of ammonia borane

Manna, Joydev; Akbayrak, Serdar; Özkâr, Saim

doi:10.1016/j.jcis.2017.08.045

Cited by 57 publications

(19 citation statements)

References 51 publications

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“…Spinel ferrite nanoparticles (SF-NPs) adopting the general A 2+ Fe2 3+ O4 formula with A = Ni [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], Ni-Zn [1,2,8,, Mn [1,[60][61][62], Co [1,60,61,[63][64][65][66][67][68][69][70][71][72][73], Co-Zn [74][75][76][77][78][79], Ni-Cu [43], Zn [80][81][82][83][84][85], Mn-Zn…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Bajorek

Berger

Dulski

et al. 2019

Journal of Physics and Chemistry of Solids

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The comprehensive study of the Ni0.5Zn0.5Fe2O4 ferrite nanopowder crystallized in the inverse spinel structure and synthesized by co-precipitation method is presented. The distribution of Fe 3+ cations among tetrahedral and octahedral sites was confirmed. The microstructural investigations revealed the presence of ultrafine grained structure with an average crystallites size in the range of 14 ÷ 20 nm. Raman and Fourier-Transform Infrared (FTIR) spectroscopy studies confirmed typical spinel structure with tetrahedrally and octahedrally iron occupancy as well as indicate co-associated iron-oxide phases considered as factors responsible for the structural disorder. The magnetic properties revealed the superparamagnetic behavior at the room temperature with estimated critical size of single domain particles about 63 nm. The analysis of saturation magnetization pointed to the spin canting phenomenon in the surface layer. The valuation of exchange coupling parameters based on the mean field theory calculation strengthened the conclusion about opposite magnetization arrangement between tetrahedral and octahedral magnetic sublattices.

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Section: Introductionmentioning

confidence: 99%

“…The last one is rather for Ni 2+ states in Boctahedral or typical for NiO states. It is well known, that XPS measurements performed for nanoparticles reveals their oxidation[70].…”

mentioning

confidence: 99%

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Bajorek

Berger

Dulski

et al. 2019

Journal of Physics and Chemistry of Solids

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“…However, PDA‐free Pd 0 ‐CoFe 2 O 4 and the related mixed silica‐supported catalyst gave even higher TOF values but exhibited similar stabilities in reuses (entries 5, 6). Their third sample is a catalyst bearing Ni 0 /Ni 2+ species (3.47 % Ni‐PDA/CoFe 2 O 4 , 8.5±1.0 nm layer) with similar features to those in entry 1 (entry 7) . In turn, the two catalysts without PDA gave high E a values and exhibited the lowest stabilities in reuse (entries 8, 9).…”

Section: Miscellaneous Transformationsmentioning

confidence: 92%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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“…To prevent the active component from interacting with the support, protecting the support surface using an inert layer of a polymer or silica was proposed. It was also shown that CoFe 2 O 4 and Fe 3 O 4 used as supports were themselves not active in this process [ 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the studied cobaltites and molybdates, the application perspectives of Fe 3 O 4 and ferrrites of transition metals for the AB hydrolysis have not yet been completely investigated. Traditionally, these oxides have been proposed for applications such as magnetically removable supports [40][41][42][43][44]. To prevent the active component from interacting with the support, protecting the support surface using an inert layer of a polymer or silica was proposed.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Behavior of Iron-Containing Cubic Spinel in the Hydrolysis and Hydrothermolysis of Ammonia Borane

et al. 2021

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The paper presents a comparative study of the activity of magnetite (Fe3O4) and copper and cobalt ferrites with the structure of a cubic spinel synthesized by combustion of glycine-nitrate precursors in the reactions of ammonia borane (NH3BH3) hydrolysis and hydrothermolysis. It was shown that the use of copper ferrite in the studied reactions of NH3BH3 dehydrogenation has the advantages of a high catalytic activity and the absence of an induction period in the H2 generation curve due to the activating action of copper on the reduction of iron. Two methods have been proposed to improve catalytic activity of Fe3O4-based systems: (1) replacement of a portion of Fe2+ cations in the spinel by active cations including Cu2+ and (2) preparation of highly dispersed multiphase oxide systems, involving oxide of copper.

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Nickel(0) nanoparticles supported on bare or coated cobalt ferrite as highly active, magnetically isolable and reusable catalyst for hydrolytic dehydrogenation of ammonia borane

Cited by 57 publications

References 51 publications

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

Polydopamine – its Prolific Use as Catalyst and Support Material

Catalytic Behavior of Iron-Containing Cubic Spinel in the Hydrolysis and Hydrothermolysis of Ammonia Borane

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