Methods for oxidation and two-way and three-way ZPGM catalyst systems and apparatus comprising same
AssigneeClean Diesel Technology Inc.
InventorZahra Nazarpoor
Life of this patent
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Abstract
Oxidation ZPGM catalyst systems and three way ZPGM catalyst systems are disclosed. ZPGM catalyst systems may oxidize toxic gases, such as carbon monoxide and hydrocarbons, optionally some ZPGM catalyst systems may as well reduce nitrogen oxides that may be included in exhaust gases. ZPGM catalyst systems may include: a substrate, a washcoat, and an overcoat. The washcoat may include at least one ZPGM catalyst and carrier material oxides. Similarly, overcoat may include at least one ZPGM catalyst, carrier material oxides and OSMs. Suitable known in the art chemical techniques, deposition methods and treatment systems may be employed in order to form the disclosed ZPGM catalyst systems.
Claims23
A method for reducing emissions from an engine having associated therewith an exhaust system, the method providing a catalyst system for a reaction effective for selective catalytic reduction, comprising:
- providing a substrate;
- depositing on said substrate a washcoat suitable for deposition on the substrate, comprising at least one oxide solid, silver, or mixtures thereof;
- and
- depositing an overcoat suitable for deposition on the substrate, comprising copper oxide, cerium, or mixtures thereof;
- wherein the one of the washcoat or overcoat is capable of converting at least one selected from the group consisting of CO, NOx and HC.
A catalytic apparatus, comprising:
- a catalyst system, comprising:
- a substrate comprising cordierite;
- a washcoat suitable for deposition on the substrate, comprising at least one oxygen storage material and alumina;
- and
- an overcoat suitable for deposition on the substrate, comprising copper oxide, cerium, alumina, and at least one oxygen storage material,
- wherein the ratio of the alumina and the oxygen storage material in the washcoat is about 60:40 by weight and the ratio of the alumina and the oxygen storage material in the overcoat is about 40:60 by weight;
- wherein the one of the washcoat or overcoat is capable of converting at least one selected from the group consisting of CO, NOx and HC.
Dependencies are inferred from the claim text.