Reduction of Molybdenum Trioxide by Using Hydrogen

Abstract:

Metallic molybdenum was synthesized through reduction of molybdenum trioxide (MoO₃) by using hydrogen as a reducing agent. The reduction behavior of MoO₃ were investigated by using temperature programmed reduction (TPR). The reduced phases were characterized by X-ray diffraction spectroscopy (XRD). The XRD results indicate that the reduction of MoO₃ proceed in two steps reduction (MoO₃ → MoO₂ → Mo) with formation of intermediate phases of Mo₄O₁₁ during first step of reduction. However, the TPR results showed only one broad peak that correspond to all reduction step that was merge into one peak. It seem that, increasing the temperature cause the rapid reduction that correlated with thermodynamic consideration data that show the formation of metallic molybdenum is become feasible by increasing the temperature.

• Periodical: Materials Science Forum (Volume 888)
• Pages: 404-408
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.888.404
• Online since: March 2017
• Authors: Mohd Nor Latif*, Alinda Samsuri, Mohamed Wahab Mohamed Hisham, Mohd Ambar Yarmo
• Keywords: Hydrogen, Molybdenum, Molybdenum Trioxide, Reduction

References

[1] K. Manukyan, D. Davtyan, J. Bossert, S. Kharatyan, Direct reduction of ammonium molybdate to elemental molybdenum by combustion reaction, Chem. Eng. J., 168 (2011) 925–930.

DOI: 10.1016/j.cej.2011.01.080

[2] G. S. Kim, Y. J. Lee, D. G. Kim,Y. Do Kim, Consolidation behavior of Mo powder fabricated from milled Mo oxide by hydrogen-reduction, J. Alloys Compd. 454 (2008), 327–330.

DOI: 10.1016/j.jallcom.2006.12.039

[3] M. Saghafi, S. Heshmati-Manesh, A. Ataie, A. A. Khodadadi, Synthesis of nanocrystalline molybdenum by hydrogen reduction of mechanically activated MoO3, Int. J. Refract. Met. Hard Mater. 30 (2012), 128–132.

DOI: 10.1016/j.ijrmhm.2011.07.014

[4] L. Wang, G. Zhang, K. Chou, Mechanism and kinetic study of hydrogen reduction of ultra-fine spherical MoO3 to MoO2, Int . Journal of Refractory Metals and Hard Materials, 54 (2016) 342–350.

DOI: 10.1016/j.ijrmhm.2015.09.003

[5] J. Dang, G. H. Zhang, K. C. Chou, R. G. Reddy, Y. He,Y. Sun, Kinetics and mechanism of hydrogen reduction of MoO3 to MoO2, Int. J. Refract. Met. Hard Mater., 41 (2013) 216–223.

DOI: 10.1016/j.ijrmhm.2013.04.002

[6] J. Wang, Z. Ren, W. Liu, F. Gao, M. Zhou, Effects of RE2O3 doping on the reduction behavior of molybdenum oxide and properties of molybdenum powder, Int. J. Refract. Met. Hard Mater., 27 (2009), 155–158.

DOI: 10.1016/j.ijrmhm.2008.06.003

[7] W. V. Schulmeyer, H. M. Ortner, Mechanisms of the hydrogen reduction of molybdenum oxides, Met. Powder Rep., 20 (2002) 261–269.