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DTA/TG study of CuO and MoO3 co-reduction by combined Mg/C reducers

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Abstract

The mechanism of copper (II) oxide and molybdenum (VI) oxide co-reduction by Mg + C mixture was investigated at non-isothermal conditions by carrying out simultaneous differential thermal (DTA) and thermogravimetric (TG) analyses combined with X-ray diffraction (XRD) analysis of intermediate and final products. The whole process was found to involve several phenomena: interaction between oxides with CuMoO4 salt formation, high-exothermic reactions occurring directly between metal oxides and magnesium, as well as low-exothermic carbothermal reactions. In order to better understand the complex nature of calorimetric and TG curves, the behaviour of each single reagent as well as that of binary, ternary and quaternary mixtures was studied at linear heating. It was revealed that the simultaneous reduction of Cu and Mo oxides proceeds more easily by carbon than by magnesium. Only due to the decisive role of carbon on the reaction pathway, the combined and complete reduction of oxides by Mg/C reducing mixture becomes possible at relatively low temperatures. The sequence of chemical reactions possibly occurring during the heating process on the basis of DTA/TG curves and XRD analyses results of quenched reaction products has been proposed.

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Acknowledgements

The authors acknowledge the financial support of the State Committee of Science of the Republic of Armenia (Project #13_1D192).

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Authors and Affiliations

  1. Laboratory of Kinetics of SHS Processes, A.B. Nalbandyan Institute of Chemical Physics NAS RA, 5/2, P. Sevak Str., 0014, Yerevan, Armenia

    Hasmik Kirakosyan, Ofik Niazyan, Sofiya Aydinyan & Suren Kharatyan

  2. Department of Inorganic and Analytical Chemistry, Yerevan State University, 1, A. Manoogian Str., 0025, Yerevan, Armenia

    Tatev Minasyan, Sofiya Aydinyan & Suren Kharatyan

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  1. Hasmik Kirakosyan
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  2. Tatev Minasyan
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  3. Ofik Niazyan
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  4. Sofiya Aydinyan
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  5. Suren Kharatyan
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Correspondence to Sofiya Aydinyan.

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Kirakosyan, H., Minasyan, T., Niazyan, O. et al. DTA/TG study of CuO and MoO3 co-reduction by combined Mg/C reducers. J Therm Anal Calorim 123, 35–41 (2016). https://doi.org/10.1007/s10973-015-4919-z

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  • DOI: https://doi.org/10.1007/s10973-015-4919-z

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