Systems and Methods for Managing a Synergistic Relationship Between PGM and Copper-Manganese in a Three Way Catalyst Systems

摘要

Synergized Platinum Group Metals (SPGM) catalyst systems for TWC application are disclosed. Disclosed SPGM catalyst systems may include a washcoat with a Cu—Mn spinel structure, Cu1.0Mn2.0O4, supported on Nb2O5—ZrO2 and an overcoat that includes PGM supported on carrier material oxides, such as alumina. SPGM catalyst system that includes the spinel structure of Cu1.0Mn2.0O4 show significant improvement in nitrogen oxide reduction performance under stoichiometric operating conditions and especially under lean operating conditions, which allows a reduced consumption of fuel. Additionally, disclosed SPGM catalyst system with spinel structure of Cu1.0Mn2.0O4 also enhances the reduction of carbon monoxide and hydrocarbon within catalytic converters. Furthermore, disclosed SPGM catalyst systems are found to have enhanced catalyst activity compared to same catalyst system that do not include Cu—Mn spinel catalysts, showing that there is a synergistic effect among PGM catalyst and Cu—Mn stoichiometric spinel structure within the disclosed SPGM catalyst system.

主权项

1. A catalyst system, comprising:
at least one substrate; at least one washcoat comprising at least one oxygen storage material further comprising Cu—Mn spinel having a niobium-zirconia support oxide; and at least one overcoat comprising at least one selected from the group comprising platinum group metal catalyst, Al2O3, and mixtures thereof; wherein the catalyst system has a T50 value of less than 300° C.