Enhanced catalytic activity at the stoichiometric condition of zero-PGM catalysts for TWC applications
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-021/00
B01J-021/04
B01J-021/06
B01J-021/08
B01J-023/00
B01J-023/72
B01J-023/755
B01J-023/889
B01J-035/00
B01J-035/02
B01J-035/04
B01J-023/20
B01J-037/02
B01J-037/08
B01D-053/94
출원번호
US-0377368
(2016-12-13)
등록번호
US-9861964
(2018-01-09)
발명자
/ 주소
Nazarpoor, Zahra
Golden, Stephen J.
출원인 / 주소
Clean Diesel Technologies, Inc.
대리인 / 주소
Alston & Bird LLP
인용정보
피인용 횟수 :
0인용 특허 :
60
초록▼
The present disclosure relates to zero-PGM (ZPGM) catalysts including variations of Nickel-doped Copper-Manganese spinel for improved catalyst performance at the stoichiometric condition for use within three-way catalyst (TWC) applications. The ZPGM catalyst material compositions within the aforemen
The present disclosure relates to zero-PGM (ZPGM) catalysts including variations of Nickel-doped Copper-Manganese spinel for improved catalyst performance at the stoichiometric condition for use within three-way catalyst (TWC) applications. The ZPGM catalyst material compositions within the aforementioned ZPGM catalysts are expressed with general formulas of Cu1-XNiXMn2O4 (A-site substitution) and Cu1Mn2-XNiXO4 (B-site substitution). The ZPGM catalysts are subjected to a TWC isothermal steady-state sweep test to assess the catalytic performance (e.g., NO conversion). Test results indicate the ZPGM catalysts exhibit higher NO conversions, at stoichiometric condition and lean conditions, when Ni substituted the B-site cation of the Cu—Mn spinel as compared to Ni substituted the A-site cation of the Cu—Mn spinel. Additionally, NO conversions of the ZPGM catalysts are significantly affected, at the stoichiometric condition, by the molar ratio of the Ni dopant within the A or B-site cation of the Cu—Mn spinel.
대표청구항▼
1. A catalyst comprising: a substrate;a washcoat layer overlying the substrate, the washcoat layer comprising a support oxide; andan impregnation layer overlying the washcoat layer, the impregnation layer comprising a doped binary spinel having the formula CuMn2-xNixO4 wherein x is a number from 0.0
1. A catalyst comprising: a substrate;a washcoat layer overlying the substrate, the washcoat layer comprising a support oxide; andan impregnation layer overlying the washcoat layer, the impregnation layer comprising a doped binary spinel having the formula CuMn2-xNixO4 wherein x is a number from 0.01 to 1.99. 2. The catalyst of claim 1, wherein x is a number ranging from 0.2 to 1.8, from 0.2 to 1.5, from 0.2 to 1.25, from 0.2 to 1.0, from 0.2 to 0.75, from 0.2 to 0.5, from 0.5 to 1.8, from 0.5 to 1.5, ranging from 0.5 to 1.25, from 0.5 to 1.0, from 0.5 to 0.75, from 0.75 to 1.8, from 0.75 to 1.5, from 0.75 to 1.25, from 0.75 to 1.0, from 1.0 to 1.8, from 1.0 to 1.5, or from 1.0 to 1.25. 3. The catalyst of claim 1, wherein the support oxide is selected from the group consisting of Al2O3, doped Al2O3, ZrO2, doped ZrO2, SiO2, doped SiO2, TiO2, doped TiO2, Al2O3—ZrO2, doped Al2O3—ZrO2, Nb2O5, doped Nb2O5, and mixtures thereof, and wherein the dopant in the support oxide, when present, is selected from the group consisting of calcium, strontium, barium, yttrium, lanthanum, cerium, neodymium, praseodymium, niobium, silicon, tantalum, and combinations thereof. 4. The catalyst of claim 1, wherein the washcoat layer comprises Nb-doped Al2O3—ZrO2. 5. A catalyst comprising a substrate;a washcoat layer overlying the substrate, the washcoat layer comprising a support oxide; andan impregnation layer overlying the washcoat layer, the impregnation layer comprising a doped binary spinel having the formula Cu1-xNixMn2O4 wherein x is a number from 0.01 to 0.99. 6. The catalyst of claim 5, wherein x is a number ranging from 0.01 to 0.70, from 0.01 to 0.5, from 0.01 to 0.2, from 0.01 to 0.1, from 0.1 to 0.7, from 0.1 to 0.5, from 0.1 to 0.2, from 0.2 to 0.7, or from 0.2 to 0.5. 7. The catalyst of claim 5, wherein the doped binary spinel further comprises an additional dopant selected from the group consisting of titanium, aluminum, magnesium, cobalt, barium, lanthanum, cadmium, tin, yttrium, zirconium, silver, iron, chromium, niobium, cerium, scandium, molybdenum, tungsten, and combinations thereof. 8. The catalyst of claim 5, wherein the support oxide is selected from the group consisting of Al2O3, doped Al2O3, ZrO2, doped ZrO2, SiO2, doped SiO2, TiO2, doped TiO2, Al2O3—ZrO2, doped Al2O3—ZrO2, Nb2O5, doped Nb2O5, and mixtures thereof, and wherein the dopant in the support oxide, when present, is selected from the group consisting of calcium, strontium, barium, yttrium, lanthanum, cerium, neodymium, praseodymium, niobium, silicon, tantalum, and combinations thereof. 9. The catalyst of claim 5, wherein the washcoat layer comprises Nb-doped Al2O3—ZrO2. 10. The catalyst of claim 5, wherein the impregnation layer is deposited overlying the washcoat layer as a solution, and has been calcined at a temperature from about 600° C. to about 700° C. 11. The catalyst of claim 5, wherein the catalyst exhibits an NO percent conversion that is from about 25 to about 70%.
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