Synergized PGM Catalyst Systems Including Platinum for TWC Application

摘要

Synergized Platinum Group Metals (SPGM) catalyst system for TWC application is disclosed. Disclosed SPGM catalyst system may include a washcoat that includes stoichiometric Cu—Mn spinel structure, supported on doped ZrO2, and an overcoat that includes PGM, such as platinum (Pt) supported on carrier material oxides, such as alumina. SPGM catalyst system shows significant improvement in nitrogen oxide reduction performance under lean and also rich operating conditions. Additionally, disclosed SPGM catalyst system exhibits enhanced catalytic activity for carbon monoxide conversion. Furthermore, disclosed SPGM catalyst systems are found to have enhanced catalytic activity compared to PGM catalyst system, showing that there is a synergistic effect between PGM catalyst, such as Pt, and Cu—Mn spinel within disclosed SPGM catalyst system, which help in activity and thermal stability of disclosed SPGM catalyst.

主权项

1. A synergized platinum group metal (SPGM) 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 platinum group metal catalyst and Al2O3; wherein the at least one platinum group metal catalyst has a concentration of about 6 g/ft3 to about 1 g/ft3; and wherein NOx conversion is higher as compared to a platinum group metal catalyst having substantially no Cu—Mn spinel.