Abstract—This study was undertaken to investigate the effect of noble metals (ruthenium, osmium and silver) on the reduction behaviour of iron oxide by (10%,v/v) carbon monoxide as a reductant. Powder of iron oxide samples doped with noble metal were prepared by impregnation method. The reduction behaviour of samples were characterized by temperature programmed reduction (TPR) and the phases formed of partially and completely reduced samples were characterized by X-ray diffraction spectroscopy (XRD). It is found that Ru enhanced the reducibility of the iron oxide compare to osmium and silver in the order as follows Ru-Fe
2O
3 > Os-Fe
2O
3 > Ag-Fe
2O
3. TPR results indicate that the reduction of Ru doped and undoped iron oxide proceed in three steps reduction (Fe2O
3 → Fe
3O4 → FeO → Fe) with reduction to metal iron completed at lower temperature (650 ⁰C) compared to undoped iron oxide (900 ⁰C), while, Os-Fe
2O
3 and Ag-Fe
2O
3 inhibits complete reduction of Fe
2O
3 to metallic Fe by stabilizing the intermediate FeO as shown in the XRD profile. Furthermore, the decrease in the activation energy of Ru doped iron oxide regarding to all transition phases (Fe
2O
3 → Fe
3O
4 → FeO → Fe) during the reduction process may also led to the increase in the rates of iron oxide reduction.
Index Terms—Reduction, iron oxide, noble metal, carbon monoxide.
The authors are with the School of Chemical Science & Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia (e-mail: tengkushafazila@gmail.com).
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Cite: Tengku Shafazila Tengku Saharuddin, Fairous Salleh, Alinda Samsuri, Rizafizah Othaman, and Mohd Ambar Yarmo, "Influence of Noble Metal (Ru, Os and Ag) on the Reduction Behaviour of Iron Oxide Using Carbon Monoxide: TPR and Kinetic Studies," International Journal of Chemical Engineering and Applications vol. 6, no. 6, pp. 405-409, 2015.
