Abstract—The reduction behaviour of molybdenum trioxide, (MoO
3) and nickel (Ni) doped MoO
3 using carbon monoxide (CO) as reductant was investigated by temperature programmed reduction (TPR) and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscope analysis (TEM). The reduction characteristics of MoO
3 to MoO
2 were examined up to temperature 700 ºC and continued with isothermal reduction by 20 vol. % CO in nitrogen. The studies show that, TPR spectra of doped MoO
3 slightly shift to a lower temperature as compared to the undoped MoO
3 which begins at 630 ºC. The interaction between nickel and molybdenum ions leads to this slightly decrease of the reduction temperature of Ni doped MoO
3. Analysis using XRD confirmed, the addition of Ni enhances the reducibility of MoO
3. By addition of Ni, complete reduction to MoO
2 were take place at only 30 minutes starting of the isothermal reduction at 700 °C. Whereas, for undoped MoO
3 it takes about 60 minutes to completely reduce to MoO
2. However, excess of CO brings to the formation of molybdenum carbide (Mo
2C). Based on the results, it is confirmed addition of Ni to MoO
3 has a remarkable influence by reducing temperature in the reduction process. The ability to enhance the reducibility involved in MoO
3 may be associated to the presence of nickel molybdate, NiMoO
4 compound.
Index Terms—Carbon monoxide, molybdenum trioxide, nickel, reduction.
Alinda Samsuri is with School of Chemical Science & Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia, and on study leave from Centre for Defence Foundation Studies, Universiti Pertahanan Nasional Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia (e-mail: alindasamsuri@gmail.com).
Fairous Salleh, Tengku Shafazila Tengku Saharuddin, Rizafizah Othaman, and Mohd. Ambar Yarmo are with School of Chemical Science & Food Technology, Faculty of Science and Technology, Universiti Kebangsan Malaysia, 43600 Bangi, Selangor, Malaysia (e-mail: fairoussalleh@gmail.com, tengkushafazila@gmail.com, rizafizah@ukm.edu.my, ambar@ukm.edu.my).
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Cite: Alinda Samsuri, Fairous Salleh, Tengku Shafazila Tengku Saharuddin, Rizafizah Othaman, and Mohd. Ambar Yarmo, "Study on the Reduction Behaviour of Nickel Doped Molybdenum Trioxide by Using Carbon Monoxide as Reductant," International Journal of Chemical Engineering and Applications vol. 7, no. 1, pp. 16-21, 2016.
