REGENERATION OF V2O5–TiO2 CATALYSTS FOR NITROGEN MONOXIDE REDUCTION POISONED BY POTASSIUM SALTS

Abstract

Abstract The activities of V2O5–TiO2 catalysts poisoned by potassium salts were recovered from 70 to 90% compared to that of the virgin catalyst by calcining in air to oxidized all vanadium species to fifth-valence, followed by treating with a solution of sodium sulfate or ammonium sulfate to remove the potassium salts of 97–98%.