Optimal Composition of Copper-Manganese Spinel in ZPGM Catalyst for TWC Applications

Abstract

It is an object of the present disclosure, to provide an optimized catalyst composition with variations of Cu and Mn molar ratio, which may include a formulation CuxMn3-xO4 spinel, with a plurality of molar ratio variations for selecting the optimal Cu—Mn molar ratio for TWC application. The formulation may include a support oxide, such as Nb2O5—ZrO2. Employing this optimized Cu and Mn ratio in spinel as overcoat may achieve optimal NO conversion, high catalyst activity, and enhanced thermal stability, having a chemical composition substantially free from PGM and rare earth metals. According to principles of the present disclosure, the disclosed Cu—Mn spinel on Nb—Zr support oxide for TWC applications may require a washcoat of alumina, and overcoat of Cu—Mn spinel on Nb—Zr support oxide.

Dependencies are inferred from the claim text.