Rhodium-Iron Catalysts

摘要

The present disclosure describes rhodium iron catalysts of use in catalyst systems. Disclosed here are TWCs configured to include a substrate and one or more of a washcoat layer, an impregnation layer, and/or an overcoat layer. Disclosed herein are one or more of a washcoat layer and/or an overcoat layer formed using a slurry that includes one or more of an oxygen storage material, a refractory support oxide, iron, and rhodium. Disclosed herein are methods of preparing catalysts wherein a washcoat layer is deposited onto the substrate, one or more impregnation layers may be deposited onto the washcoat layer, one or more overcoat layers may be deposited onto the impregnation washcoat layer, and one or more additional impregnation layers may be deposited onto the one or more washcoat layers.

主权项

1. A catalyst system, comprising:
a substrate; a washcoat deposited on the substrate; at least one impregnation layer; and an overcoat; wherein the washcoat comprises at least one of the group consisting of about 10 wt % to about 75 wt % cerium oxide, about 25 wt % to about 90 wt % zirconium-hafnium oxide, about 0 wt % to about 15 wt % lanthanum oxide, about 0 wt % to about 15 wt % neodymium oxide, about 0 wt % to about 15 wt % yttrium oxide, and about 0 wt % to about 15 wt % praseodymium oxide; wherein the at least one impregnation layer comprises one or more of the group consisting of rhodium, iron nitrate, cerium, and combinations thereof; and wherein the overcoat comprises at least one of the group consisting of a second oxygen storage material, a second refractory support oxide, iron, rhodium, and combinations thereof.