PROCEDURE TO IMPROVE THE AGEING CHARACTERISTICS OF CATALYSTS APPLIED IN THE OXIDATIVE PURIFICATION OF EXHAUST GASES ORIGINATING FROM COMBUSTION ENGINES FUELLED WITH LEADED GASOLINE

摘要

The invention provides a method of improving the ageing characteristics of catalysts used for the oxidative purification of exhaust gases from combustion engines fuelled with leaded gasoline, wherein the engines are kept running, essentially, at the stoichiometric air/fuel ratio.