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http://dx.doi.org/10.7844/kirr.2022.31.1.29

The Hydrogen Reduction Behavior of MoO3 Powder  

Koo, Won Beom (Korea Maritime & Ocean University)
Yoo, Kyoungkeun (Korea Maritime & Ocean University)
Kim, Hanggoo (Korea Maritime & Ocean University)
Publication Information
Resources Recycling / v.31, no.1, 2022 , pp. 29-36 More about this Journal
Abstract
The hydrogen reduction behavior of molybdenum oxides was studied using a horizontal-tube reactor. Reduction was carried out in two stages: MoO3 → MoO2 and MoO2 → Mo. In the first stage, a mixed gas composed of 30 vol% H2 and 70 vol% Ar was selected for the MoO3 reduction because of its highly exothermic reaction. The temperature ranged from 550 to 600 ℃, and the residence time ranged from 30 to 150 min. In the second step, pure H2 gas was used for the MoO2 reduction, and the temperature and residence time ranges were 700-750 ℃ and 30-150 min, respectively. The hydrogen reduction behavior of molybdenum oxides was found to be somewhat different between the two stages. For the first stage, a temperature dependence of the reaction rate was observed, and the best curve fittings were obtained with a surface reaction control mechanism, despite the presence of intermediate oxides under the conditions of this study. Based on this mechanism, the activation energy and pre-exponential were calculated as 85.0 kJ/mol and 9.18 × 107, respectively. In addition, the pore size within a particle increases with the temperature and residence time. In the second stage, a temperature dependence of the reaction rate was also observed; however, the surface reaction control mechanism fit only the early part, which can be ascribed to the degradation of the oxide crystals by a volume change as the MoO2 → Mo phase transformation proceeded in the later part.
Keywords
Molybdenum; Hydrogen Reduction; 2- stage Reduction; $MoO_3$; $MoO_2$;
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