Electrochemical Reduction of Molybdenum(VI) Compounds in Molten Lithium Chloride-Potassium Chloride Eutectic

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Abstract
Molybdenum (VI) oxide reacts with molten eutectic at 450° to form , which probably is present as an anion , and pyromolybdate, . Both of these species are electrochemically reduced to , which can be reoxidized to by current reversal. A second reduction step, observed whether or is added to the melt, can be attributed to the reduction of , formed as a secondary reaction product in the first step. The reduction of molybdate proceeds in two steps, the first at −0.85V and the second at −1.75V vs. the 1M Pt(II)/Pt reference electrode. The first step shows an abnormally short transition time, attributable to a slow equilibrium. The second step corresponds to a diffusion‐controlled reduction with , yielding a product of the empirical formula .

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