method of preparing SO -> SO conversion catalyst using exhausted vanadium catalysts Russian patent published in 1999 - IPC

FIELD: oxidation catalysts. SUBSTANCE: method including leaching active components in slurry, separating them with filter from solid residue, treating filtrate and solid residue, mixing the latter with active components from filtrate, adding components of fresh contact mass, drying, molding, and heat treatment is distinguished by that solid residue after filtration is treated with solution of potassium and/or sodium alkali at molar ratio SiO₂/(K₂O+Na₂O)-V₂O₅ from 2.5 to 29.8 until degree of SiO₂ isolation into solution attains 0.1 to 1.0, after which sulfuric acid-containing SiO₂ and V₂O₅ gel is coprecipitated. EFFECT: increased percentage of use of exhausted catalyst with high working characteristics preserved. 6 cl, 1 tbl, 15 ex