Reactivity of Thermal Decomposition Products of Ammonium MetavanadateTowards Sodium Sulfate at Different Temperature

Abstract

The present study is devoted to throw some light on the probable

interactions between ammonium metavanadate and sodium sulfite which

may help in preparation of vanadium-containing catalyst used in sulfuric

acid industry. The probable interactions are in fact chemical reactions

between the resulted reactive decomposition products of both salts. The

reactive species produced from ammonium metavanadate are

(NH₄)₄ V₆O₁₇·l4H₂O and V₂O₅ whereas those produced from sodium sulfite

are Na₂S₅O₁₆, Na₂O, Na₂SO₄ and Na₂S. The crystalline reaction

products produced at different temperatures are Na₂V₆O₁₆·3H₂O, V₂S₃,

NaV₆O₁₅, NaV₃O₈ and Na₈V₂₄O₆₃. The factors which affect the formation

and quantities of different products are discussed with the help of the results

obtained from X-ray diffraction, electronic absorption spectra,

thermogravimetric and chemicals analyses.