Abstract
The kinetics of hydrolytic precipitation of potassium vanadates KxV12O31-δ ·nH2O(0 < x ≤ 2.25; 0 <δ ≤ 1.15) from a KVO3 solution at pH = 1.7 and 80°C in the presence of K2SO4 and VOSO4 is controlled by second and third order reactions respectively occurring on the precipitate surface. This difference is due to the effect of VO2+ ions on the polymer anion [V12 O31-δ]n formation. Potassium vanadates KxV12O31-δ ·nH2O and KxV3O8-δ·nH2O (1.02 ≤ x ≤ 1.91; 0 ≤ δ ≤ 0.22) can be used as vanadium-containing precursors for sulfuric acid catalysts.
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Podvalnaya, N., Volkov, V. & Andreykov, E. Potassium Vanadates of Mixed Valence as Sulfuric Acid Catalyst Precursors. Reaction Kinetics and Catalysis Letters 73, 357–365 (2001). https://doi.org/10.1023/A:1014188130254
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DOI: https://doi.org/10.1023/A:1014188130254