Synthesis and characterization of nano-sized nickel ferrites from fly ash for catalytic oxidation of CO

Rashad, M.M.; Fouad, Osama A.

doi:10.1016/j.matchemphys.2005.05.028

Cited by 119 publications

(44 citation statements)

References 17 publications

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“…According to XRD data, the incorporation of iron and nickel in the NiFe 2 O 4 structure is not complete at 850°C for the CP catalysts. These results are in agreement with those of M. M. Rashad et al [18] who showed that the formation of pure phase NiFe 2 O 4 , using co-precipitation method, is observed around 1200°C. Raman spectra (Fig.…”

Section: Structural Properties Characterization Of Cp and Ht Catalystssupporting

confidence: 93%

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Benrabaa¹,

Boukhlouf²,

Barama³

et al. 2011

Catal Lett

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Section: Structural Properties Characterization Of Cp and Ht Catalystssupporting

confidence: 93%

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Benrabaa¹,

Boukhlouf²,

Barama³

et al. 2011

Catal Lett

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“…In fact, ferrites are already effective catalysts for various processes like treatment of exhaust gases [9], oxidation of toluene [10] or propane [11], gas sensing [12]. Nickel ferrites showed good catalytic properties in the presence of reducing gas such as CO [13], and cobalt ferrites were tested for the Fischer Tropsch reaction [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and microstructure of cobalt ferrite nanoparticles

Ajroudi

Villain

Madigou

et al. 2010

Journal of Crystal Growth

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Cobalt ferrites (Co x Fe 3-x O 4 ) nanoparticles with various compositions were synthesized by a new non-aqueous synthesis method. The cobalt ferrites were characterized by X-rays diffraction, and transmission electron microscopy coupled with energy dispersive spectroscopy. The nanoparticles are highly crystallized, with a homogeneous chemical composition. The particle size varies from 4 nm up to 7.5 nm, depending on the cobalt content. The smallest particles, with a size of 4 nm, are obtained for high cobalt content.These particles have also the highest micro-structural strain. Catalytic measurements were realized using Fourier Transform Infrared Spectroscopy. The lowest activation energy and the highest conversion rate are obtained for Co 1.8 Fe 2.4 O 4 , in the 400-500 °C temperature range.

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“…The precursor is thermally treated in a porcelain crucible at a temperature range from 500 to 1,200°C for 120 min. Detailed description on synthesis of samples is published elsewhere [10].…”

Section: Materials Synthesismentioning

confidence: 99%

Catalytic Oxidation of CO Over Synthesized Nickel Ferrite Nanoparticles from Fly Ash

2008

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Catalytic oxidation of carbon monoxide (CO) gas over nanosized nickel ferrites prepared from fly ash has been investigated. X-ray diffraction analyses showed that pure crystalline nickel ferrite, NiFe 2 O 4 , phase can be obtained by thermal treatment of the precursors at temperature [800°C for 120 min in the studied pH range, from 7 (neutral) to 12 (highly alkaline). In the temperature range 500 B T B 800°C, impure low crystalline NiFe 2 O 4 phase formed. The main impurities are FeO (OH) and Fe 2 O 3 Á H 2 O phases. Higher magnetization (32 emu/g) is obtained for a precursor precipitated at pH 10 and thermally treated at 1,200°C for 120 min. The catalytic oxidation of CO over nanocrystalline NiFe 2 O 4 powders was studied using quadrupole mass gas analyzer system. The main parameters as crystal size, surface area and firing temperature are used to clarify the efficiency of using NiFe 2 O 4 powders in catalytic oxidation of CO. It was found that the efficiency of catalytic oxidation decreased by increasing firing temperature and crystallite size of the samples. The lower crystal size (2-8.5 nm), the higher surface area (25-55 m 2 /g) and the presence of impurities FeO(OH) phase enhanced CO adsorption and consequently its oxidation.

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Synthesis and characterization of nano-sized nickel ferrites from fly ash for catalytic oxidation of CO

Cited by 119 publications

References 17 publications

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Structural, Textural and Acid–Base Properties of Nano-Sized NiFe2O4 Spinel Catalysts

Synthesis and microstructure of cobalt ferrite nanoparticles

Catalytic Oxidation of CO Over Synthesized Nickel Ferrite Nanoparticles from Fly Ash

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