COMPOSITION A BASE D'OXYDES DE XIROCONIUM, DE PRASEODYME, DE LANTHANE OULE NEODYME, PROCEDE DE PREPARATION ET UTLISATION DANS UN SYSTEME CATALYTIQUE

摘要

the invention relates to a process for treating a gas containing nitrogen oxides (nox), which is characterized in that it uses as a nox trap (a composition based on an oxidation catalyst ofno2 and nox are a compound of zirconium oxide and praseodymium oxide in a proportion of praseodymium oxide is between 5% and 50% by weight of the oxide.the compound may further include of the cerium oxide.the method of the invention can be used in the treatment of exhaust gases of internal combustion engines, diesel type, gas type and operating in combination.