Aging inorganic workpieces used as catalyst or catalyst carrier for treating exhaust gases comprises heat treating at specified temperature under specified pressure

摘要

Aging inorganic workpieces comprises heat treating the workpieces at 1000-1350 deg C under a pressure of 10<-7> to 10<-2> mbar for 1-60 hours. Preferred Features: The workpieces are placed into a vacuum furnace, flushed with an inert gas, and heated to 850 deg C. The furnace is then evacuated to the prescribed pressure and heated to the required temperature. The workpieces are cooled to room temperature in a hydrogen-containing atmosphere or inert gas atmosphere after heat treatment. The workpieces are metallic, oxidic or ceramic, especially an exhaust gas catalyst or catalyst carrier.