Pengaruh kromium terhadap kelakuan penurunan ferik oksida dengan menggunakan karbon monoksida: Kajian penurunan suhu berprogram dan kinetik

Translated title of the contribution: Influence of chromium on the reduction behavior of ferric oxide by using carbon monoxide: Temperature programmed reduction and kinetic studies

Tengku Shafazila Tengku Saharuddin, Alinda Samsuri, Fairous Salleh, Mohammad Kassim, Rizafizah Othaman, Mohamed Wahab Mohamed Hisham, Mohd. Ambar Yarmo

Research output: Contribution to journalArticle

Abstract

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-Fe2O3). The reduction behaviour and the kinetic studies of Cr-Fe2O3 and Fe2O3 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-Fe2O3 proceeded in two reduction steps (Fe2O3 → Fe3O4 → Fe), while, Fe2O3 proceeded in three reduction steps (Fe2O3 → Fe3O4 → 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-Fe2O3 are more intense compare to Fe2O33, indicating that the improvement on the crystallinity of the characteristic peaks of Fe2O3 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 Fe2O3 → Fe3O4 during the reduction process may also led to the increase in the rates of ferric oxide reduction.

Original languageMalay
Pages (from-to)531-538
Number of pages8
JournalMalaysian Journal of Analytical Sciences
Volume20
Issue number3
DOIs
Publication statusPublished - 2016

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Chromium
Carbon Monoxide
Kinetics
Temperature
Activation energy
ferric oxide
Spectroscopy
X ray diffraction
Reducing Agents
Nitrogen
Diffraction

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Pengaruh kromium terhadap kelakuan penurunan ferik oksida dengan menggunakan karbon monoksida : Kajian penurunan suhu berprogram dan kinetik. / Tengku Saharuddin, Tengku Shafazila; Samsuri, Alinda; Salleh, Fairous; Kassim, Mohammad; Othaman, Rizafizah; Mohamed Hisham, Mohamed Wahab; Yarmo, Mohd. Ambar.

In: Malaysian Journal of Analytical Sciences, Vol. 20, No. 3, 2016, p. 531-538.

Research output: Contribution to journalArticle

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abstract = "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-Fe2O3). The reduction behaviour and the kinetic studies of Cr-Fe2O3 and Fe2O3 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-Fe2O3 proceeded in two reduction steps (Fe2O3 → Fe3O4 → Fe), while, Fe2O3 proceeded in three reduction steps (Fe2O3 → Fe3O4 → 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-Fe2O3 are more intense compare to Fe2O33, indicating that the improvement on the crystallinity of the characteristic peaks of Fe2O3 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 Fe2O3 → Fe3O4 during the reduction process may also led to the increase in the rates of ferric oxide reduction.",
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AU - Tengku Saharuddin, Tengku Shafazila

AU - Samsuri, Alinda

AU - Salleh, Fairous

AU - Kassim, Mohammad

AU - Othaman, Rizafizah

AU - Mohamed Hisham, Mohamed Wahab

AU - Yarmo, Mohd. Ambar

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AB - 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-Fe2O3). The reduction behaviour and the kinetic studies of Cr-Fe2O3 and Fe2O3 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-Fe2O3 proceeded in two reduction steps (Fe2O3 → Fe3O4 → Fe), while, Fe2O3 proceeded in three reduction steps (Fe2O3 → Fe3O4 → 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-Fe2O3 are more intense compare to Fe2O33, indicating that the improvement on the crystallinity of the characteristic peaks of Fe2O3 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 Fe2O3 → Fe3O4 during the reduction process may also led to the increase in the rates of ferric oxide reduction.

KW - Carbon monoxide

KW - Chromium

KW - Ferric oxide

KW - Kinetic

KW - Reduction

KW - Temperature programmed reduction

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