Ni–Fe mixed oxides prepared by calcination of layered double hydroxides: Potential pigments for the ceramic industry

Holgado, Patricia H.; Holgado, M. J.; Román, S. San; Rives, V.

doi:10.1016/j.ceramint.2015.03.047

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…HTlcs have a brucite-like structure, and divalent cations M 2+ can be substituted by the trivalent cation M 3+ . Accordingly, the charge balance of the layger is compensated by anions, and interlayer space is occupied by a water molecule. , The generated formula is represented as [(M 2+ ) n (M 3+ ) m (OH) 2( n + m ) ] m + [(A x – ) m / x ]· y H 2 O, in which the M 3+ and M 2+ are the layer forming trivalent and divalent cations and A x – is the interlayer anion . After calcination, the HTcls structure decomposes to generate complex metal oxides which exhibit advantages in metal dispersion, reactivity, and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Fe–Ni–Al Oxygen Carrier Derived from Hydrotalcite-like Precursors for the Chemical Looping Gasification of Biomass Char

Wei

Zhao

et al. 2017

Energy Fuels

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Chemical looping gasification (CLG) of biomass uses the lattice oxygen of oxygen carriers to convert biomass into syngas with a low tar content, high heating value, and low price. It is of key importance to exploit well-dispersed and thermally stable oxygen carriers for the CLG process. In the current work, a series of oxygen carriers with varied Fe and Ni molar ratios were synthesized from hydrotalcite compound precursors (HTlcs), which made the metallic elements mix at the molecular level. Consequently, highly dispersed complex metal oxygen carriers can be achieved after precursor calcinations. CLG of biomass char was carried out in TGA and a fixed bed reactor accompanied by various physical and chemical analyses for the fresh and used oxygen carriers. The result manifested the HTlcs crystalline form, which was formed in the precursors and produced the Fe0.99Ni0.6Al1.1O4 compound after calcination, suggesting that a high degree dispersion of the multimetal oxygen carrier was synthesized. The main H2 uptake and CLG reactivity of the oxygen carriers were related to its higher metal dispersion and synergistic effect between Fe and Ni. Accordingly, there was an optimum Fe/Ni ratio of 4:1 in oxygen carriers at which the oxygen carrier can achieve better CLG reactivity. Also, the oxygen carrier to biomass char mass ratio of 7:3 provided a maximum weight loss of 35.59% and a largest mass loss rate of 2.46 wt %/min, suggesting higher lattice oxygen releasing efficiency. CO exhibited a higher generating rate in the CLG reactions owing to its higher reaction activation energy with lattice oxygen [O], while H2 was more prone to being consumed. The morphological analysis of fresh and regenerated samples exhibited that the oxygen carrier was reduced to the Fe3Ni2 alloy phase after the CLG process, and the lattice oxygen can be fully recovered in an air atmosphere. Although the BET surface displayed a decreased trend in the regenerated oxygen carriers, serious sintering was not observed in the samples, and the main metallic crystallized phases were still maintained.

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Section: Introductionmentioning

confidence: 99%

“…Accordingly, the charge balance of the layger is compensated by anions, and interlayer space is occupied by a water molecule. 29,30 The generated formula is represented as…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Fe–Ni–Al Oxygen Carrier Derived from Hydrotalcite-like Precursors for the Chemical Looping Gasification of Biomass Char

Wei

Zhao

et al. 2017

Energy Fuels

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“…10 °C/min. The calcined material (encoded C -LDH) was then collected and directly stored in a desiccator under nitrogen for further use . The yield was approximately 2.31 g.…”

Section: Methodsmentioning

confidence: 99%

Tailoring of a Potential Nanoformulated Form of Gibberellic Acid: Synthesis, Characterization, and Field Applications on Vegetation and Flowering

Hafez

Osman

Sewedan

et al. 2018

J. Agric. Food Chem.

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Nanoformulation of agrochemicals has become a potential choice to improve the physicochemical properties, enhance the utilization efficiency, and reduce the side effects and ecotoxicity of many hazardous chemicals. Here, we tailored a new formulation platform for gibberellic acid (GA) using the layered double hydroxides (LDH) as a potential carrier. Typically, we synthesized, characterized, and potentially applied the newly nanoformulated form of GA on the quantity and quality properties of Dendranthema grandiflorum cultivar. We also evaluated the synergetic effect of the carrier LDH on the release behavior of GA, showing a remarkable impact on the utilization efficiency of GA. The nanohybrid structure of GA also showed an enhanced thermal stability and safe preservation for the incorporated moieties. Taking into account the hazardous effect of free GA on the environment and human health, the hybrid technique of GA is one of the best choices among all of the studied protocols.

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“…Among the several methods, high random distribution of the metal ions or complexes are based on the use of a matrix are fix (solution or gel). This increases the chemical homogeneity and reduces the segregation of a particular metal during the processing and crystallization of the mixed metal oxides [6][7]. In these chemical methods, the metal ions are immobilized on an atomic scale, which allows obtaining oxides at lower temperatures than solid state reaction.…”

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confidence: 99%

Sugarcane Juice Based Sol-Gel Method for Mn Substituted Magnesium Ferrites.

Mali.¹

2017

IJAR

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Manganese substituted magnesium ferrites having stoichiometric composition Mg 1-x Mn x Fe 2 O 4 with x ranging from 0.0 to 1.0 were prepared sugarcane juice based Sol-gel method. X-ray diffraction was used to characterize the structure and phases present respectively. It was found that of all ferrite compositions at 800°C led to cubes of the ferrite grains and that there was single phase spinel structure. The Xray diffraction patterns revealed the presence of (311) …………………………………………………………………………………………………….... Introduction:-Nanoscale crystalline mixed metal oxides are synthesized by several mechanical and chemical methods. The main objective is to reduce the costs of chemical synthesis and to produce materials for technological applications [1][2][3][4][5]. Among the several methods, high random distribution of the metal ions or complexes are based on the use of a matrix are fix (solution or gel). This increases the chemical homogeneity and reduces the segregation of a particular metal during the processing and crystallization of the mixed metal oxides [6][7]. In these chemical methods, the metal ions are immobilized on an atomic scale, which allows obtaining oxides at lower temperatures than solid state reaction. Due to the immobilization, the metal ions react with each other with a minimum diffusion; consequently, it is possible to synthesize homogeneous and stoichiometric oxides [8][9]. Sol-gel is one of the best techniques with these characteristics [10]. In these techniques, the particle size can be controlled by the formation and aggregation of the particles in the starting sol, which is dependent on the concentration of reagents, temperature, pH, electro negativity of the metals, solvent etc. [11][12][13][14][15]. Besides the versatility and simplicity water is the most polar solvent, the aqueous solution-gel method can offer a better chemical homogeneity compared to other solvents. Therefore, aqueous solution-gel synthesis method was tested to produce cheap nanocrystalline powders.This new technique is based on the use of sugarcane juice as the chelating agent, and it stands out by its simplicity, low processing cost and reduces environmental pollution, using sugarcane juice and metal nitrates nano-crystalline mixed metal oxides are synthesized. The process is similar to previous work [16]. In this paper, the chemical route is similar but sugarcane juice is used as the chelating agent for the synthesis of nanoscale Mn Substituted MgFe 2 O 4 for the study of electrical resistivity.

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Ni–Fe mixed oxides prepared by calcination of layered double hydroxides: Potential pigments for the ceramic industry

Cited by 12 publications

References 23 publications

Experimental Investigation of Fe–Ni–Al Oxygen Carrier Derived from Hydrotalcite-like Precursors for the Chemical Looping Gasification of Biomass Char

Experimental Investigation of Fe–Ni–Al Oxygen Carrier Derived from Hydrotalcite-like Precursors for the Chemical Looping Gasification of Biomass Char

Tailoring of a Potential Nanoformulated Form of Gibberellic Acid: Synthesis, Characterization, and Field Applications on Vegetation and Flowering

Sugarcane Juice Based Sol-Gel Method for Mn Substituted Magnesium Ferrites.

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