Preparation and Characterization of Nano Ferrites

Lazarević, Zorica Ž.; Jovalekić, Čedomir; Milutinović, A.; Romčević, M.; Romčević, N.

doi:10.12693/aphyspola.121.682

Cited by 59 publications

(24 citation statements)

References 18 publications

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“…43 The resulting spectrum of Mn 0.6 Fe 2.4 O y is in agreement with previous reports. 43 The resulting spectrum of Mn 0.6 Fe 2.4 O y is in agreement with previous reports.…”

Section: Bulk Samples Characterizationsupporting

confidence: 92%

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Towards an improved process for hydrogen production: the chemical-loop reforming of ethanol

Vozniuk

Agnoli²,

Artiglia³

et al. 2016

Green Chem.

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International audienceM-modified ferrospinels with the formula M0.6Fe2.4Oy (M = Co, Mn or Co/Mn) were employed as ionic oxygen and electron carrier materials for an alternative sustainable route to produce hydrogen via chemical-loop reforming of ethanol. The new materials were tested in terms of both redox properties and catalytic activity to generate hydrogen by oxidation with steam, after a reductive step carried out with ethanol. In addition, the research includes in situ DRIFTS and in situ XPS studies that allowed the extraction of information at the molecular level and following surface changes within the reduction/re-oxidation processes during ethanol chemical-loop reforming. It was found that Co(II)-incorporation in spinels effectively improves decomposition/oxidation of ethanol, however a greater amount of coke is accumulated. On the other hand, addition of Mn(II) into the system helps to significantly reduce the amount of coke and hence to avoid fast deactivation of the material. Thus, the behavior of Co0.3Mn0.3Fe2.4Oy was shown to be the most promising one, as this material forms less coke during the reduction step, and consequently less COx is generated during the re-oxidation step with water, nevertheless a high hydrogen yield is maintained

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“…43 The resulting spectrum of Mn 0.6 Fe 2.4 O y is in agreement with previous reports. 43 The resulting spectrum of Mn 0.6 Fe 2.4 O y is in agreement with previous reports.…”

Section: Bulk Samples Characterizationsupporting

confidence: 92%

“…Table 1 reports the surface area measurements. 43 In spite of this, nanostructured powders of various synthesis and treatment methods can exhibit different degrees of inversion. Moreover, the particle size, morphology and structure of the samples were investigated by means of TEM.…”

Section: Bulk Samples Characterizationmentioning

confidence: 99%

Towards an improved process for hydrogen production: the chemical-loop reforming of ethanol

Vozniuk

Agnoli²,

Artiglia³

et al. 2016

Green Chem.

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“…Similar behavior was observed for Co/Mn incorporation in Co 0.6‐x Mn x Fe 2.4 O y system . Hence, Mn 2+ ions are proposed to partially replace Fe 3+ ions in the T d sites, which may cause a change of the inversion degree towards the formation of the normal spinel . The low intensity of the peaks and partial energy shifts can also be related to a lack of long‐range ordering in the small dimension systems along with the effects owing to the high defectivity and low crystallinity as confirmed by XRD.…”

Section: Resultssupporting

confidence: 62%

Structural Changes of Binary/Ternary Spinel Oxides During Ethanol Anaerobic Decomposition

et al. 2017

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Several M‐modified iron oxides of the spinel family have proven to be effective electron and O2− vectors for the production of hydrogen in the chemical‐loop reforming of bio‐alcohols. The present work is specifically focused on investigation of ethanol anaerobic decomposition over spinel oxides, which results in significant structural changes of the oxygen carrier material itself and corresponds to a first step of the chemical‐loop reforming process. In particular, a series of binary/ternary M‐modified ferrospinels were prepared by a co‐precipitation method and tested in terms of both redox properties and intrinsic catalytic activity in addition to a complex ex situ study that encompasses the solid‐state chemistry investigations of the fresh and reduced oxygen carrier materials. It was found that Co/Cu incorporation facilitates total/partial oxidation of ethanol, giving rise to high yields of H2, COx, and H2O; whereas Mn incorporation predominantly favored dehydrogenation and condensation reactions, leading to the formation of acetaldehyde and acetone. In addition, the incorporation of Mn contributed to significantly reduce the amount of coke formed; however, it caused a lower intrinsic reducibility, which was explained by the formation of a thermodynamically stable and hardly reducible layer of MnxFeyO solid solution.

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“…Fig. 2(a) and 2(b) shows TEM images of pure NiFe2O4 nanoparticles and PANI/NiFe2O4 nanocomposites (30%) respectively [36]. From polygonic morphology of NiFe2O4 nanoparticles, the average particle size was observed as 30nm, whereas average particle size of PANI/NiFe2O4 nanocomposite (30%) was observed as 40nm.…”

Section: Resultsmentioning

confidence: 95%

Structural and optical properties of polyaniline/nickel ferrite nanocomposites

Nandapure

2021

Advanced Materials Proceedings

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Polyaniline/ferrite nanocomposites have attracted increasing attention because they offer the possibility of a new generation of nanostructure materials with advanced applications like electromagnetic interference shielding, rechargeable batteries, corrosion devices due to their flexibility, inexpensive and easy of synthesis. Polyaniline (PANI) containing MFe2O4 were prepared by in-situ polymerization of aniline in aqueous solution (Where M-represent divalent metal cation, M 2+ = Ni 2+ ). PANI reduces the agglomeration of nanosized nickel ferrite (NiFe2O4) particles which is good for the stabilization of nanoparticles. The investigation of structural, morphological and optical properties was carried out for the synthesized PANI/NiFe2O4 nanocomposites using X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Ultraviolet visible spectrophotometer (UV-Vis). XRD revealed that the structure of NiFe2O4 nanoparticles is spinel with space group Fd3m and crystallite size 14 nm. Lattice parameter was found to increases with NiFe2O4 concentration in PANI and this may be due to the larger ionic radius of the Ni 2+ ion. XRD pattern of PANI/NiFe2O4 nanocomposites at different ferrite molar percent are just the superposition of those of polyaniline and ferrite nanoparticles. Transmission electron microscopy of PANI/NiFe2O4 nanocomposites show increase in particle size over pure a NiFe2O4 nanoparticles which is relevant with XRD results. UV-Visible absorption spectroscopy of PANI/NiFe2O4 nanocomposites shows two absorption bands in range of 300-350 nm and 600-650 nm which reflects interaction of ferrite nanoparticles with PANI.

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Preparation and Characterization of Nano Ferrites

Cited by 59 publications

References 18 publications

Towards an improved process for hydrogen production: the chemical-loop reforming of ethanol

Towards an improved process for hydrogen production: the chemical-loop reforming of ethanol

Structural Changes of Binary/Ternary Spinel Oxides During Ethanol Anaerobic Decomposition

Structural and optical properties of polyaniline/nickel ferrite nanocomposites

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