Topochemical approach of kinetics of the reduction of hematite to wüstite

K. Piotrowski; K. Mondal; T. Wiltowski; P. Dydo; G. Rizeg

doi:10.1016/j.cej.2006.12.024

Topochemical approach of kinetics of the reduction of hematite to wüstite

K. Piotrowski
, K. Mondal
, T. Wiltowski
, P. Dydo
, G. Rizeg

Southern Illinois University
General Electric

Research output: Contribution to journal › Article › peer-review

175 Citations (Scopus)

Abstract

The kinetics of hematite (Fe₂O₃) to wüstite (FeO) reduction has been investigated. Kinetic parameters have been estimated based on the thermogravimetric data. The Avrami-Erofe'ev equation of coupled nucleation and growth processes was successfully applied to describe the initial stages of the process, while four diffusion equations were tested to model the final stages of the process. It was found that the initial stage can be interpreted theoretically as the crystals' nucleation and 1D growth at the gas/iron oxide(s) interface, which gradually shifts to diffusion control. Kinetic and diffusion regions for various temperatures (within the 700-900 °C range) were identified. The value of activation energy ΔE_a of the reaction was estimated and compared with the literature data.

Original language	English
Pages (from-to)	73-82
Number of pages	10
Journal	Chemical Engineering Journal
Volume	131
Issue number	1-3
DOIs	https://doi.org/10.1016/j.cej.2006.12.024
Publication status	Published - 1 Jul 2007

Keywords

Avrami-Erofe'ev model
Hematite
Iron-oxide(s) reduction
Isothermal gas-solid reaction kinetics
Magnetite
TGA data
Topochemical reaction
Wüstite

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.cej.2006.12.024

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title = "Topochemical approach of kinetics of the reduction of hematite to w{\"u}stite",

abstract = "The kinetics of hematite (Fe2O3) to w{\"u}stite (FeO) reduction has been investigated. Kinetic parameters have been estimated based on the thermogravimetric data. The Avrami-Erofe'ev equation of coupled nucleation and growth processes was successfully applied to describe the initial stages of the process, while four diffusion equations were tested to model the final stages of the process. It was found that the initial stage can be interpreted theoretically as the crystals' nucleation and 1D growth at the gas/iron oxide(s) interface, which gradually shifts to diffusion control. Kinetic and diffusion regions for various temperatures (within the 700-900 °C range) were identified. The value of activation energy ΔEa of the reaction was estimated and compared with the literature data.",

keywords = "Avrami-Erofe'ev model, Hematite, Iron-oxide(s) reduction, Isothermal gas-solid reaction kinetics, Magnetite, TGA data, Topochemical reaction, W{\"u}stite",

author = "K. Piotrowski and K. Mondal and T. Wiltowski and P. Dydo and G. Rizeg",

year = "2007",

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doi = "10.1016/j.cej.2006.12.024",

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journal = "Chemical Engineering Journal",

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}

TY - JOUR

T1 - Topochemical approach of kinetics of the reduction of hematite to wüstite

AU - Piotrowski, K.

AU - Mondal, K.

AU - Wiltowski, T.

AU - Dydo, P.

AU - Rizeg, G.

PY - 2007/7/1

Y1 - 2007/7/1

N2 - The kinetics of hematite (Fe2O3) to wüstite (FeO) reduction has been investigated. Kinetic parameters have been estimated based on the thermogravimetric data. The Avrami-Erofe'ev equation of coupled nucleation and growth processes was successfully applied to describe the initial stages of the process, while four diffusion equations were tested to model the final stages of the process. It was found that the initial stage can be interpreted theoretically as the crystals' nucleation and 1D growth at the gas/iron oxide(s) interface, which gradually shifts to diffusion control. Kinetic and diffusion regions for various temperatures (within the 700-900 °C range) were identified. The value of activation energy ΔEa of the reaction was estimated and compared with the literature data.

AB - The kinetics of hematite (Fe2O3) to wüstite (FeO) reduction has been investigated. Kinetic parameters have been estimated based on the thermogravimetric data. The Avrami-Erofe'ev equation of coupled nucleation and growth processes was successfully applied to describe the initial stages of the process, while four diffusion equations were tested to model the final stages of the process. It was found that the initial stage can be interpreted theoretically as the crystals' nucleation and 1D growth at the gas/iron oxide(s) interface, which gradually shifts to diffusion control. Kinetic and diffusion regions for various temperatures (within the 700-900 °C range) were identified. The value of activation energy ΔEa of the reaction was estimated and compared with the literature data.

KW - Avrami-Erofe'ev model

KW - Hematite

KW - Iron-oxide(s) reduction

KW - Isothermal gas-solid reaction kinetics

KW - Magnetite

KW - TGA data

KW - Topochemical reaction

KW - Wüstite

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DO - 10.1016/j.cej.2006.12.024

M3 - Article

AN - SCOPUS:34248339630

SN - 1385-8947

VL - 131

SP - 73

EP - 82

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

IS - 1-3

ER -

Topochemical approach of kinetics of the reduction of hematite to wüstite

Abstract

Keywords

ASJC Scopus subject areas

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