CATALYSTS TO REDUCE SPINEL-BASED NITROGEN OXIDES EMISSION.

摘要

The present invention concerns to the utilization of catalysts for the treatment of internal combustion engines exhaust gases having a high oxygen content. These catalysts can be of the type including a spinel structure massic oxide, and are of formula ZnA12O4, or including a normal spinel or reverse spinel structure oxide, with the exemption of ZnA12O4. Said catalysts can be obtained particularly by disaggregation of spinel constitutive element precursors, or from a salt solution or suspension of said spinel constitutive element; the media so obtained is subsequently dryed and calcinated. The catalysts of the present invention can also be obtained by a mixture of precursors of the spinel constitutive element and combustion of a carbon and nitrogen source.