Perovskite catalyst system for lean burn engines

Details Perovskite catalyst system for lean burn engines Perovskite catalyst system for lean burn engines

2006-07-04

2006-07-04

Johnson, Christina (Department: 1725)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C502S303000, C502S304000, C502S325000, C502S326000, C502S328000, C502S330000, C502S331000, C502S338000, C502S339000, C502S324000, C502S344000, C502S345000, C502S340000, C502S349000

Reexamination Certificate

active

07071141

ABSTRACT:
A catalyst system for use with an internal combustion engine to provide emissions reductions under lean and stoichiometric operating conditions. The catalyst system comprises a first catalyst comprised of a newly developed Perovskite-based formulation having an ABO3crystal structure designed to bring the precious metal and NOx trapping elements close together. The first catalyst acts primarily to maximize the reduction of emissions under lean operating conditions. The catalyst system also comprises a second catalyst comprised of precious metals which acts primarily to maximize the reduction of emissions under stoichiometric conditions.

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