Przemysl Chemiczny, Vol.85, No.8-9, 865-866, 2006
The use of a spent vanadium catalyst for the syntheses of sodium metavanadate(V) and potassium metavanadate(V)
At 873 K, reactions 4(Na or K)Cl + 2V(2)O(5) (spent catalyst) + O-2 = 4(Na or K)VO3 + 2Cl(2) gave (Na or K)VO3 in (87% or 26%) yields in 4 hrs, air flow rate 182 cm(3)/min, and with NaCl used in 15% and KCl in 50% excess over V2O5. The catalyst calcined at 800 degrees C/21 hrs. was free of S oxides. The catalyst particle size fractions 0.090-0.125 and 0.355-0.5 mm were resp. best to get the above max. yields.