Compositions of lean NO_xtrap (LNT) systems and methods of making and using same

摘要

The present disclosure relates to a substrate comprising nanoparticle catalysts and NOx storage materials for treatment of gases, and washcoats for use in preparing such a substrate. Also provided are methods of preparation of the nanoparticle catalysts and NOx storage materials, as well as methods of preparation of the substrate comprising the nanoparticle catalysts and NOx storage materials. More specifically, the present disclosure relates to a coated substrate comprising nanoparticle catalysts and NOx storage materials for lean NOx trap (LNT) systems, useful in the treatment of exhaust gases.

主权项

1. A coated substrate comprising:
a substrate; a washcoat layer comprising oxidative catalytically active micron-particles, the oxidative catalytically active micron-particles comprising oxidative composite nanoparticles bonded to a first micron-sized carrier particle, the oxidative composite nanoparticles comprising a first support nanoparticle and an oxidative catalytic nanoparticle; a washcoat layer comprising reductive catalytically active micron-particles, the reductive catalytically active micron-particles comprising reductive composite nanoparticles bonded to a second micron-sized carrier particle, the reductive composite nanoparticles comprising a second support nanoparticle and a reductive catalytic nanoparticle; and a washcoat layer comprising NOx trapping particles, the NOx trapping particles comprising a micron-sized cerium oxide-containing material.