Abstract:Selective catalytic reduction catalysts containing vanadium, tungsten and titanium are widely used in many industrial applications to reduce nitrogen oxides. Denitrification catalysts in various industries are entering the peak period of scrapping and replacement, and it is urgent to recycle valuable metal from waste catalysts. Recycled vanadium, tungsten and titanium can be used to produce new catalysts or other products to form circular economy. Extraction process of vanadium and tungsten from waste denitrification catalyst is reviewed. Leaching and separation of vanadium and tungsten are introduced.