Systems and methods for zero-PGM binary catalyst having Cu, Mn, and Fe for TWC applications

摘要

Variations of bulk powder catalyst material including Cu—Mn, Cu—Fe, and Fe—Mn spinel systems for ZPGM TWC applications are disclosed. The disclosed bulk powder catalyst samples include stoichiometric and non-stoichiometric Cu—Mn, Cu—Fe, and Fe—Mn spinels on Pr6O11—ZrO2 support oxide, prepared using incipient wetness method. Activity measurements under isothermal steady state sweep test condition may be performed under rich to lean condition. Catalytic activity of samples may be compared to analyze the influence that different binary spinel system bulk powders may have on TWC performance of ZPGM materials for a plurality of TWC applications. Stoichiometric Cu—Mn, Cu—Fe, and Fe—Mn spinel systems exhibit higher catalytic activity than non-stoichiometric Cu—Mn, Cu—Fe, and Fe—Mn spinel systems. The influence of prepared Cu—Mn, Cu—Fe, and Fe—Mn spinel systems may lead into cost effective manufacturing solutions for ZPGM TWC systems.

主权项

1. A catalytic system, comprising:
a substrate; a washcoat applied to said substrate; and an overcoat applied to said washcoat comprising at least one support oxide and at least two catalysts applied to the at least one support oxide; wherein the at least two catalysts have the general formula AXB3-XO4, wherein X may be less than or equal to 1.5 and wherein A and B are selected from the group consisting of Cu, Mn, and Fe; and wherein the at least two catalysts are substantially free of platinum group metals.