Synthesis and characterization of nickel-doped ceria nanoparticles with improved surface reducibility

Derafa, Wassila; Paloukis, Fotios; Mewafy, Basma; Baaziz, Walid; Ersen, Ovidiu; Petit, C.; Corbel, Gwenaël; Zafeiratos, Spyridon

doi:10.1039/c8ra07995a

Cited by 27 publications

(26 citation statements)

References 41 publications

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“…The newly emerged Raman peaks in Fig. 7c for Ni30 6 h sample were reported previously in relation to aliovalent doping and oxygen vacancies [51] rather than NiO islands. The inherent advantage of nickel doping over iron doping is obvious as seen in Fig.…”

Section: Co Oxidation Activitysupporting

confidence: 81%

Low temperature CO oxidation by doped cerium oxide electrospun fibers

Sim

Wang

2020

Nano Convergence

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We investigated CO oxidation behavior of doped cerium oxide fibers. Electrospinning technique was used to fabricate the inorganic fibers after burning off polymer component at 600 °C in air. Cu, Ni, Co, Mn, Fe, and La were doped at 10 and 30 mol% by dissolving metal salts into the polymeric electrospinning solution. 10 mol% Cu-doped ceria fiber showed excellent catalytic activity for low temperature CO oxidation with 50% CO conversion at just 52 °C. This 10 mol% Cu-doped sample showed unexpected regeneration behavior under simple ambient air annealing at 400 °C. From the CO oxidation behavior of the 12 samples, we conclude that absolute oxygen vacancy concentration estimated by Raman spectroscopy is not a good indicator for low temperature CO oxidation catalysts unless extra care is taken such that the Raman signal reflects oxide surface status. The experimental trend over the six dopants showed limited agreement with theoretically calculated oxygen vacancy formation energy in the literature.

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Section: Co Oxidation Activitysupporting

confidence: 81%

Low temperature CO oxidation by doped cerium oxide electrospun fibers

Sim

Wang

2020

Nano Convergence

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“…These broad bands are also visible after reduction and reaction. Note that the additional bands after calcination at ν = 234 cm −1 and ν = 629 cm −1 have been also observed by Derafa et al for Ni 0.1 Ce 0.9 O 2−x synthesized from heterobimetallic Schiff bases complex precursors and assigned to the incorporation of Ce 3+ and Ni 3+ into the ceria lattice [28]. After reduction and reaction, no additional bands to be assigned to NiO and IrO 2 are visible, which describes a complete reduction under the conditions used.…”

Section: Characterization Of the Catalyst Niirceo X _iwisupporting

confidence: 76%

Reaction Analyses Based on Quaternary Metal/Metal Oxide Catalyst Testing in Micro-Structured Reactors Using Combinatorial High-Throughput Methods for Power-to-Gas Applications

et al. 2020

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To optimize the Sabatier process, quaternary supported catalyst materials are synthesized and tested. The syntheses are performed by the industrially established, reproducible and automated methods of impregnation and sol–gel synthesis. The screening of the 588 quaternary catalysts is carried out in a specially designed 10-fold parallel gas flow micro-structured reactor as wall catalysts in sequential operation mode at a temperature of T = 573 K and a pressure of p = 15 bar. For the description of the activity, the reaction parameters CO2 conversion, CH4 yield, and CH4/CO2 selectivity are used. These are determined by analyses of the gas phase composition using µGC-FID. The catalysts with the highest activities are validated in a micro-structured reactor with similar characteristics as the screening reactor in the temperature range between T = 573–673 K and a pressure of p = 15 bar. Characterization by powder X-ray diffraction, Raman spectra, and scanning transmission electron microscopic images data on the phase and element distribution after calcination and reduction was conducted.

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“…The Ni 2p 3/2 line was composed by the main peak at 856 eV and a satellite feature at higher binding energies, which might be because of weak surface bonding between Ni and CeO 2 and showed successful loading of nickel on ceria as reported in the literature. [ 50 ] Fe was also present, showing peaks at 711 and 714 eV (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

Hybrid ceria and chitosan supported nickel nanoparticles: A recyclable nanocatalytic system in the reduction of nitroarenes and the synthesis of benzopyran derivatives in green solvent

Mahajan

Gupta

2021

Applied Organom Chemis

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Mesoporous, highly temperature resistant, magnetically separable, bimetallic, and organic‐based photoluminescent nanocatalyst has been prepared. Chitosan can act efficiently as a support material for preparing nanocatalysts. Hybrid ceria, that is, iron‐doped‐cerium oxide (Fe@CeO2), was prepared via coprecipitation method. Chitosan–iron‐doped‐ceria nanocomposite was prepared and kept in a solution of NiCl2 to adsorb Ni2+ ions, which were then reduced with NaBH4 to accumulate nickel nanoparticles. The characterization of nanocatalyst was performed using different techniques such as X‐ray diffraction (XRD), field emission scanning electron microscopy (FE‐SEM), high‐resolution transmission electron microscope (HR‐TEM), energy dispersive X‐ray spectra (EDX), Brunauer–Emmett–Teller (BET), X‐ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) analysis. The catalyst was found to have a very small size about 2–3 nm and having a large surface area of about 121 m2 g−1, which was stable up to 800°C. It was also found to be photoluminescent. The catalyst thus prepared is useful for the reduction of nitroarenes, which is a toxic compound that is often found as a pollutant in the environment, to anilines, key intermediates for the fine chemical, agrochemical, and pharmaceutical industries. Also, nanocatalyst was used for the synthesis of various substituted tetrahydrobenzo[b]pyrans, which is an essential structural component in various natural products, in good to excellent yields.

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Synthesis and characterization of nickel-doped ceria nanoparticles with improved surface reducibility

Abstract: Nickel-doped ceria nanoparticles (Ni0.1Ce0.9O2−x NPs) were fabricated from Schiff-base complexes and characterized by various microscopic and spectroscopic methods.

Cited by 27 publications

References 41 publications

Low temperature CO oxidation by doped cerium oxide electrospun fibers

Low temperature CO oxidation by doped cerium oxide electrospun fibers

Reaction Analyses Based on Quaternary Metal/Metal Oxide Catalyst Testing in Micro-Structured Reactors Using Combinatorial High-Throughput Methods for Power-to-Gas Applications

Hybrid ceria and chitosan supported nickel nanoparticles: A recyclable nanocatalytic system in the reduction of nitroarenes and the synthesis of benzopyran derivatives in green solvent

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