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http://dx.doi.org/10.7844/kirr.2011.20.4.071

Reduction Behavior of MoO3 to MoO2 by Ar+H2 Gas Mixture  

Sohn, Ho-Sang (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
Yi, Hyang-Jun (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
Park, Jong-Il (Research institute of Industrial Science & Technology(RlST))
Publication Information
Resources Recycling / v.20, no.4, 2011 , pp. 71-77 More about this Journal
Abstract
$MoO_3$ powders were reduced to $MoO_2$ under Ar+$H_2$ gas mixture in a tubular furnace at temperature range 723~873 K. Reaction rate was quantitatively deduced by measuring relative humidity of off gas. Observed reaction rate increased significantly with hydrogen partial pressure and reaction temperature and the rate of $H_2O$ evolution increased drastically during the initial period of reduction. As reduction proceeded, however, $H_2O$ partial pressure decreased noticeably. During the initial period of the reduction, a linear relationship for time dependence of the reduction fraction was observed. The activation energy for the reduction of $MoO_3$ to $MoO_2$was 73.56 kJ/mol during the initial period of reduction.
Keywords
Molybdenum; Hydrogen reduction; $MoO_3$; $MoO_2$; Kinetics;
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