Bimetallic Synergized PGM Catalyst Systems for TWC Application

摘要

Bimetallic Synergized Platinum Group Metals (SPGM) catalyst systems for TWC application are disclosed. Disclosed bimetallic SPGM catalyst systems may include a washcoat with a Cu—Mn spinel structure and an overcoat that includes PGMs, such as Pd/Rh or Pt/Rh supported on carrier material oxides, such as alumina. Bimetallic SPGM catalyst systems show significant improvement in nitrogen oxide reduction performance under lean operating conditions, which allows a reduced consumption of fuel. Additionally, disclosed bimetallic SPGM catalyst systems exhibit enhanced catalytic activity for carbon monoxide conversion. Furthermore, bimetallic SPGM catalyst systems are found to have enhanced catalytic activity for fresh, hydrothermally aged and fuel cut aged conditions compared to PGM catalyst system, showing that there is a synergistic effect between PGM catalyst and Cu—Mn spinel within the disclosed SPGM catalyst system which help in performance and thermal stability of disclosed SPGM catalyst systems.

主权项

1. A bimetallic synergized platinum group metals (SPGM) catalyst system comprising:
a) an overcoat comprising a bimetallic PGM catalyst; b) a washcoat comprising a CU—Mn spinel supported on doped ZrO2 support oxide; and c) a substrate.