Reactivity of Thermal Decomposition Products of Ammonium Metavanadate Towards Sodium Sulfite at Different Temperatures

摘要

The present study is devoted to throwing some lighton probable interactions between ammonium metavanadate andsodium sulfite, which may help in preparation of vanadium-containing catalyst used in the sulfuric acid industry. The probableinteractions are in fact chemical reactions between the resultingreactive decomposition products of both salts. These active speciesproduced from ammonium metavanadate are(NH_4)_4V_6O_17.14H_2O and V_2O_5, whereas thoseproducts produced at different temperatures areNa_2V_6O_16.3H_2O, Na_2O, Na_2SO_4, and Na_2S. Thecrystalline reaction products produced at different temperatures areNa_2V_6O_16.3H_2O, V_2S_3, NaV_6O_15, NaV_3O_8, andNa_8V_24O_63. The factors which affect the formation andquantities of different products are discussed with the help of theresults obtained from X-ray diffraction, electronic absorptionspectra, and thermogravimetric and chemical analyses.