ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 52, (1) 1 - 7 (2008)


INSIGHTS INTO THE OXIDATION MECHANISM OF MOLYBDENUM IN MOLTEN GLASS
 
Vanmoortel Ine 1, De Strycker Joost 2, Temmerman Eduard 1, Adriaens Annemie 1
 
1 Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, B-9000 Ghent, Belgium
2 Arcelor Innovation - R&D, OCAS N.V., J. Kennedylaan 3, B-9060 Zelzate, Belgium

Keywords: Oxidation, Mechanism, Glass melts, Molybdenum
 

This study focuses on the elaboration of the oxidation mechanism of molybdenum in a molten glass. More specifically it was sought to examine whether the anodic dissolution of molybdenum occurs in one or more steps and what the reaction products are. The work was performed in two steps. First the reaction of molybdenum ions in a glass melt at a platinum electrode was investigated. This was followed by the study of the corrosion reactions at a molybdenum electrode in this molten glass. Experiments showed that the oxidation of metallic molybdenum occurs in three steps: Mo → Mo³⁺(glass) + 3e⁻ (I); Mo³⁺ (glass) → Mo⁴⁺(surface/glass) + e⁻ or Mo → Mo⁴⁺(surface/glass) + 4e⁻ (II); Mo⁴⁺ (surface/glass) → Mo⁶⁺(glass) + 2e⁻ or Mo → Mo⁶⁺(glass) + 6e⁻ (III).


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