METHOD FOR RECOVERING NOBLE METAL FROM CATALYST DEVICE HAVING METAL CARRIER

摘要

A method for recovering a wash coat carrying a noble metal component from a catalyst device having a metal carrier, which comprises treating the catalyst device having a metal carrier provided with a wash coat and, carried thereon, a catalyst component containing a noble metal with an aqueous mixed acid solution containing sulfuric acid and nitric acid. The method can be employed for separating and recovering a wash coat carrying a catalyst component containing a noble metal from the metal carrier of a used catalyst device having a metal carrier for use in the clarification of an exhaust gas from an internal combustion engine, without substantially crashing or dissolving said metal carrier with good efficiency.