Calcination and hydrogen reduction behavior of Fe-Ni and Fe-Co powders from metal nitrates

Doh Hyung Riu; Sung Tag Oh

doi:10.1016/j.cap.2012.03.008

Calcination and hydrogen reduction behavior of Fe-Ni and Fe-Co powders from metal nitrates

Doh Hyung Riu, Sung Tag Oh

Dept. of Materials Science & Engineering

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

3 Scopus citations

Abstract

The calcination and hydrogen reduction behavior of Fe-/Ni-nitrate and Fe-/Co-nitrate have been investigated. The powder mixtures of metal oxides were prepared by solution mixing and calcination of metal nitrates. Thermogravimetry and microstructural analysis revealed that the nitrate mixtures by the calcination at 300-350 °C for 2 h were changed to Fe-oxide/NiO and Fe-oxide/Co ₃O ₄ composite powders with an average particle size of about 100 nm. The reduction behavior of the calcined powders was analyzed by thermogravimetry with different heating rates in a hydrogen atmosphere. The hydrogen reduction kinetic was evaluated by the amount of peak shift with heating rates. The activation energies for the reduction, estimated by the slope of the Kissinger plot, were measured as 83-100 kJ/mol depending on reduction steps.

Original language	English
Pages (from-to)	S188-S191
Journal	Current Applied Physics
Volume	12
Issue number	SUPPL. 2
DOIs	https://doi.org/10.1016/j.cap.2012.03.008
State	Published - Sep 2012

Keywords

Activation energy
Calcination and hydrogen reduction
Fe-Ni and Fe-Co system
Microstructure

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10.1016/j.cap.2012.03.008

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title = "Calcination and hydrogen reduction behavior of Fe-Ni and Fe-Co powders from metal nitrates",

abstract = "The calcination and hydrogen reduction behavior of Fe-/Ni-nitrate and Fe-/Co-nitrate have been investigated. The powder mixtures of metal oxides were prepared by solution mixing and calcination of metal nitrates. Thermogravimetry and microstructural analysis revealed that the nitrate mixtures by the calcination at 300-350 °C for 2 h were changed to Fe-oxide/NiO and Fe-oxide/Co 3O 4 composite powders with an average particle size of about 100 nm. The reduction behavior of the calcined powders was analyzed by thermogravimetry with different heating rates in a hydrogen atmosphere. The hydrogen reduction kinetic was evaluated by the amount of peak shift with heating rates. The activation energies for the reduction, estimated by the slope of the Kissinger plot, were measured as 83-100 kJ/mol depending on reduction steps.",

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T1 - Calcination and hydrogen reduction behavior of Fe-Ni and Fe-Co powders from metal nitrates

AU - Riu, Doh Hyung

AU - Oh, Sung Tag

PY - 2012/9

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N2 - The calcination and hydrogen reduction behavior of Fe-/Ni-nitrate and Fe-/Co-nitrate have been investigated. The powder mixtures of metal oxides were prepared by solution mixing and calcination of metal nitrates. Thermogravimetry and microstructural analysis revealed that the nitrate mixtures by the calcination at 300-350 °C for 2 h were changed to Fe-oxide/NiO and Fe-oxide/Co 3O 4 composite powders with an average particle size of about 100 nm. The reduction behavior of the calcined powders was analyzed by thermogravimetry with different heating rates in a hydrogen atmosphere. The hydrogen reduction kinetic was evaluated by the amount of peak shift with heating rates. The activation energies for the reduction, estimated by the slope of the Kissinger plot, were measured as 83-100 kJ/mol depending on reduction steps.

AB - The calcination and hydrogen reduction behavior of Fe-/Ni-nitrate and Fe-/Co-nitrate have been investigated. The powder mixtures of metal oxides were prepared by solution mixing and calcination of metal nitrates. Thermogravimetry and microstructural analysis revealed that the nitrate mixtures by the calcination at 300-350 °C for 2 h were changed to Fe-oxide/NiO and Fe-oxide/Co 3O 4 composite powders with an average particle size of about 100 nm. The reduction behavior of the calcined powders was analyzed by thermogravimetry with different heating rates in a hydrogen atmosphere. The hydrogen reduction kinetic was evaluated by the amount of peak shift with heating rates. The activation energies for the reduction, estimated by the slope of the Kissinger plot, were measured as 83-100 kJ/mol depending on reduction steps.

KW - Activation energy

KW - Calcination and hydrogen reduction

KW - Fe-Ni and Fe-Co system

KW - Microstructure

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DO - 10.1016/j.cap.2012.03.008

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SP - S188-S191

JO - Current Applied Physics

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ER -

Calcination and hydrogen reduction behavior of Fe-Ni and Fe-Co powders from metal nitrates

Abstract

Keywords

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