Systems and Methods for Variations of ZPGM Oxidation Catalysts Compositions
First Claim
1. A method for forming a zero platinum group metal (ZPGM) catalyst, comprising:
- providing at least one substrate, wherein the at least one substrate is selected from the group consisting of cordierite, zeolite, and combinations thereof;
depositing by co-precipitation a washcoat suitable for deposition on the substrate, the washcoat comprising at least one oxide solid further comprising at least one carrier metal oxide and at least one first ZPGM catalyst; and
depositing by co-precipitation an overcoat suitable for deposition on the substrate, the overcoat comprising at least one second ZPGM catalyst;
wherein at least one of the first ZPGM catalyst and second ZPGM catalyst comprises at least one perovskite structured compound having the formula ABO3, wherein A and B are selected from the group consisting of at least one of lanthanum, yttrium, silver, manganese, and combinations thereof; and
wherein the at least one carrier metal oxide comprises ZrO2.
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Accused Products
Abstract
The present disclosure refers to variation of compositions for catalytic converters free of platinum group metals, which may be employed to manufacture ZPGM oxidation catalyst systems, to remove main pollutants from exhaust of diesel engines, by oxidizing toxic gases. Suitable support oxides material may include ZrO2, ZrO2 doped with lanthanide group metals, Nb2O5, Nb2O5—ZrO2, Al2O3 and Al2O3 doped with lanthanide group metals, TiO2 and doped TiO2 may be used. Materials suitable for use as ZPGM catalysts include Lanthanum (La), Yttrium (Y), Silver (Ag), Manganese (Mn) and combinations thereof. The disclosed ZPGM DOC systems may include perovskite structures with the characteristic formulation ABO3 or related structures. A plurality of methods may be employed for production of ZPGM diesel oxidation catalyst systems substantially free of PGM, which may include a substrate, a washcoat, and an impregnation layer.
22 Citations
18 Claims
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1. A method for forming a zero platinum group metal (ZPGM) catalyst, comprising:
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providing at least one substrate, wherein the at least one substrate is selected from the group consisting of cordierite, zeolite, and combinations thereof; depositing by co-precipitation a washcoat suitable for deposition on the substrate, the washcoat comprising at least one oxide solid further comprising at least one carrier metal oxide and at least one first ZPGM catalyst; and depositing by co-precipitation an overcoat suitable for deposition on the substrate, the overcoat comprising at least one second ZPGM catalyst; wherein at least one of the first ZPGM catalyst and second ZPGM catalyst comprises at least one perovskite structured compound having the formula ABO3, wherein A and B are selected from the group consisting of at least one of lanthanum, yttrium, silver, manganese, and combinations thereof; and wherein the at least one carrier metal oxide comprises ZrO2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification