DEVICE FOR USE IN TREATMENT OF EXHAUST GASES PARTICULARLY FROM ENGINES OPERATING WITH A WEAK MIXTURE

摘要

The invention relates to a device comprising a catalytic composition made from two and optionally three catalysts used in the treatment of exhaust gases particularly from engines operating with a weak mixture. The device comprises a composition made from a first catalyst with at least one precious metal on a support made from cerium oxide, titanium oxide or a mixture of zirconium oxide and titanium oxide, a second catalyst of the NOx-trapping type and optionally a third catalyst with at least an NOx-reducing function.