Kinetics of reduction of iron oxides by H2

Pineau, Annye; Kanari, Ndue; Gaballah, I.

doi:10.1016/j.tca.2007.01.014

Cited by 239 publications

(112 citation statements)

References 18 publications

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“…Interestingly, it can be seen that the reduction degree of original oxide scale at 500°C was higher than that in the temperature range of 600-800°C. This is because the reaction of magnetite and hydrogen directly generate iron and water vapor without solid phase transition of oxide scale (Fe 3 O 4 → Fe (1 − x) O + Fe), 8,19,20) the mechanism will be further discussed in Section 4.…”

Section: Isothermal Hydrogen Reductionmentioning

confidence: 99%

Effect of Cold Rolling before Hydrogen Reduction on Reduction Behavior and Morphologies of Oxide Scale on Hot-rolled Low-carbon Steel

Cao

Lin

et al. 2017

ISIJ Int.

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Section: Isothermal Hydrogen Reductionmentioning

confidence: 99%

Effect of Cold Rolling before Hydrogen Reduction on Reduction Behavior and Morphologies of Oxide Scale on Hot-rolled Low-carbon Steel

Cao

Lin

et al. 2017

ISIJ Int.

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“…FeO ? Fe° [14,15]. TPR of our samples was carried at a low concentration of hydrogen (3% H 2 ), which has as a consequence that the reduction of FeO in metallic iron starts above 1,073 K [16,17] and occurs during the structure collapse of the zeolite.…”

Section: H 2 -Tprmentioning

confidence: 99%

Selective catalytic reduction of nitric oxide with ammonia over Fe-MOR catalysts prepared from Fe(acac)3 precursor

Hamidi

Petitto

Signorile

et al. 2011

Reac Kinet Mech Cat

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Preparation of a Fe-mordenite catalysts was carried out by impregnation using Fe(acac) 3 precursor in order to have iron oxide species deposited at the surface of the zeolite. The selective presence of iron oxide species was determined and ascertained by temperature programmed reduction (TPR). In the selective catalytic reduction of NO by ammonia, no difference of conversion between the catalysts was observed indicating that well dispersed iron oxide species are active species for this reaction. Nevertheless, the obtained activity remains lower than catalysts containing iron cationic species at the exchange sites.

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“…Reduction of ferric oxide was a subject of numerous studies due to the importance of iron and steel in the current and future technologies [1]. The iron and ferric oxide are nontoxic and cheap materials give them as an important chosen material in the catalysis field [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…The iron and ferric oxide are nontoxic and cheap materials give them as an important chosen material in the catalysis field [2,3]. As a catalyst, the reduction behaviour and the degree of reduction of the iron species were highly important in such catalysis and previous studies, reaction temperature of ferric oxide reduction was determined using thermodynamics [4,5] and experimental [1,6]. The reduction process of Fe 2 O 3 involves different mechanism depending on temperature, particle size, concentration reduction gas used and additives to the Fe 2 O 3 [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Chromium on the Reduction Behavior of Ferric Oxide by Using Carbon Monoxide: Temperature Programmed Reduction and Kinetic Studies

Saharuddin

Samsuri

Salleh

et al. 2016

MJAS

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This study was undertaken to investigate the effect of chromium on the reduction behaviour of ferric oxide with carbon monoxide (10 %, v/v) in nitrogen as a reductant. Ferric oxide was impregnated with 3 % chromium to produce chromium-doped ferric oxide (Cr-Fe 2 O 3 ). The reduction behaviour and the kinetic studies of Cr-Fe 2 O 3 and Fe 2 O 3 have been studied by temperature programmed reduction (TPR) and the phases formed of partially and completely reduced samples were characterized by X-ray diffraction spectroscopy (XRD). Meanwhile, the activation energy values were calculated from the Arrhenius equation using Wimmer's method. TPR results indicate that the reduction of Cr-Fe 2 O 3 proceeded in two reduction steps (Fe 2 O 3 → Fe 3 O 4 → Fe), while, Fe 2 O 3 proceeded in three reduction steps (Fe 2 O 3 → Fe 3 O 4 → FeO → Fe) with doped ferric oxide showed a large shifted towards lower temperature. The complete reduction of ferric oxide to metallic Fe occur at 700 °C compared to the undoped ferric oxide (900 °C). The XRD pattern showed that the diffraction peaks of Cr-Fe 2 O 3 are more intense compare to Fe 2 O 3 , indicating that the improvement on the crystallinity of the characteristic peaks of Fe 2 O 3 with no additional peak observed meaning that the chromium particles loaded on the ferric oxide were well dispersed. Furthermore, additional of 3 % chromium on ferric oxide gives larger surface area and decrease in the activation energy up to 12.39 % regarding to transition phases of Fe 2 O 3 → Fe 3 O 4 during the reduction process may also led to the increase in the rates of ferric oxide reduction.

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Kinetics of reduction of iron oxides by H2

Cited by 239 publications

References 18 publications

Effect of Cold Rolling before Hydrogen Reduction on Reduction Behavior and Morphologies of Oxide Scale on Hot-rolled Low-carbon Steel

Effect of Cold Rolling before Hydrogen Reduction on Reduction Behavior and Morphologies of Oxide Scale on Hot-rolled Low-carbon Steel

Selective catalytic reduction of nitric oxide with ammonia over Fe-MOR catalysts prepared from Fe(acac)3 precursor

Influence of Chromium on the Reduction Behavior of Ferric Oxide by Using Carbon Monoxide: Temperature Programmed Reduction and Kinetic Studies

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