Carbothermic reduction kinetics of nanocrystallite Fe2O3/NiO composites for the production of Fe/Ni alloy

Halim, K. S. Abdel; Khedr, M.H.; Nasr, M. I.; Abdel-wahab, M. Sh.

doi:10.1016/j.jallcom.2008.02.026

Cited by 30 publications

(14 citation statements)

References 15 publications

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“…The reduction of WO 3 to WO 2 by CO was found to be best represented by contracting geometric mechanism. Reduction of Fe 2 O 3 ─NiO by solid C powder has been reported to be controlled through chemical reactions at temperatures above 1100°C, where enough CO is produced to satisfy the reduction by a gas agent reducer . Similar result has been reported in another work …”

Section: Resultssupporting

confidence: 83%

“…Reduction of Fe 2 O 3 -NiO by solid C powder has been reported to be controlled through chemical reactions at temperatures above 1100 • C, where enough CO is produced to satisfy the reduction by a gas agent reducer. 41 Similar result has been reported in another work. 42 An interesting finding in the present work was that the diffusion of the reducing agent or the gaseous products did not act as the controlling mechanism in any of the reaction steps.…”

Section: The Mechanism Of Isothermal Reduction and Carburizationsupporting

confidence: 87%

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Kinetics of nonisothermal reduction and carburization of WO₃─NiO nano‐composite powders by CO─CO₂

Mohammadzadeh

Rezaie

Barati

et al. 2019

Int J of Chemical Kinetics

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The kinetics of simultaneous reduction and carburization of WO3─NiO nanocomposite powders by CO/CO2 was studied using a nonisothermal thermogravimetric analysis. The experiments were carried out at heating rates between 5 and 15°C/min, showing that the thermochemical processes can be divided into four steps, each dominated by a reaction, as following: NiO → Ni, WO3 → WO2, WO2 → W, and W → WC. The apparent activation energy for each step was obtained based on the Flynn‐Wall‐Ozawa isoconversional method for the individual steps, and the kinetic model was assessed by fitting master plots of various kinetic models for these steps at different heating rates. The Avrami‐Erofeev kinetic model was found to fit to the third and fourth steps and main part of the first, and the geometric contracting model fitted the best for the second step. Changing the heating rate did not affect the master plots of the third step. However, for the first step, increasing the heating rate made the Avrami‐Erofeev model the best‐fitting correlation and also for the second step the matching model changed at the highest heating rate (15°C/min) from a two‐dimensional contracting model (cylindrical particles) to a three‐dimensional contracting model (spherical particles).

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Section: Resultssupporting

confidence: 83%

Section: The Mechanism Of Isothermal Reduction and Carburizationsupporting

confidence: 87%

Kinetics of nonisothermal reduction and carburization of WO₃─NiO nano‐composite powders by CO─CO₂

Mohammadzadeh

Rezaie

Barati

et al. 2019

Int J of Chemical Kinetics

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“…More contribution to solid state reaction control seems to have an effect at high temperatures as discussed by Abdel-Halim et al [24].…”

Section: Introductionmentioning

confidence: 87%

A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process

El-Hussiny

Shalabí

2011

Powder Technology

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“…Secondly, NiO reacts with Fe 2 O 3 to produce NiFe 2 O 4 , which is easier to reduce. When NiO was added to Fe 2 O 3 system, the morphological structure of samples changed significantly and the porosity of the compacts increased and promoted the reduction of Fe 2 O 3 [12,29]. Compared with Ni, the promotion effect of NiO is not as obvious.…”

Section: Reduction Behavior In the Fe-ni-o-h Systemmentioning

confidence: 99%

“…The addition of NiO promotes the initial stage of reduction process of Fe2O3. Abdel-Halim et al [12] studied the preparation of ferronickel alloy by reduction of Fe2O3/NiO compound with carbon. The results showed that the reaction was carried out step by step.…”

Section: Computational Detailsmentioning

confidence: 99%

Combined Density Functional Theory and Reduction Kinetics Investigation of Enhanced Adsorption of Hydrogen onto Fe2O3 by Surface Modification with Nickel

Zhang

Wei

et al. 2019

Metals

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Based on the density functional theory, the geometric structure, adsorption energy and density of states of H 2 /α-Fe 2 O 3 (001) system and (H 2 + Ni)/α-Fe 2 O 3 (001) system were determined. The results showed that the absolute value of adsorption energy between H 2 molecule and α-Fe 2 O 3 (001) surface and the bond length of H 2 molecule were increased by the presence of Ni atom. The presence of Ni atom promotes the adsorption of H 2 molecule on α-Fe 2 O 3 (001) surface. Reduction behavior of iron and nickel oxides in H 2 atmosphere was determined by thermogravimetric analysis. The samples included Fe 2 O 3 , Fe 2 O 3 -NiO and Fe 2 O 3 -Ni systems. The effect of Ni and NiO on the reduction behavior of Fe 2 O 3 was investigated. The ease of reduction within the following three systems decreases sequentially: Fe 2 O 3 -Ni > Fe 2 O 3 -NiO > Fe 2 O 3 . The activation energy of Fe 2 O 3 -Ni, Fe 2 O 3 -NiO and Fe 2 O 3 systems at two temperature stages (viz. < 400 • C and > 400 • C) were 172 kJ·mol −1 , 197 kJ·mol −1 and 263 kJ·mol −1 respectively.

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Carbothermic reduction kinetics of nanocrystallite Fe2O3/NiO composites for the production of Fe/Ni alloy

Cited by 30 publications

References 15 publications

Kinetics of nonisothermal reduction and carburization of WO₃─NiO nano‐composite powders by CO─CO₂

Kinetics of nonisothermal reduction and carburization of WO₃─NiO nano‐composite powders by CO─CO₂

A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process

Combined Density Functional Theory and Reduction Kinetics Investigation of Enhanced Adsorption of Hydrogen onto Fe2O3 by Surface Modification with Nickel

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Carbothermic reduction kinetics of nanocrystallite Fe2O3/NiO composites for the production of Fe/Ni alloy

Cited by 30 publications

References 15 publications

Kinetics of nonisothermal reduction and carburization of WO3─NiO nano‐composite powders by CO─CO2

Kinetics of nonisothermal reduction and carburization of WO3─NiO nano‐composite powders by CO─CO2

A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process

Combined Density Functional Theory and Reduction Kinetics Investigation of Enhanced Adsorption of Hydrogen onto Fe2O3 by Surface Modification with Nickel

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Kinetics of nonisothermal reduction and carburization of WO₃─NiO nano‐composite powders by CO─CO₂

Kinetics of nonisothermal reduction and carburization of WO₃─NiO nano‐composite powders by CO─CO₂