ZPGM TWC Systems Compositions and Methods Thereof
Compositions and methods for the preparation of ZPGM TWC systems are disclosed. ZPGM TWC systems may be employed within catalytic converters to oxidize toxic gases, such as carbon monoxide and other hydrocarbons, as well as to reduce nitrogen oxides. ZPGM TWC systems are completely free of PGM catalyst and may include: a substrate, a washcoat, and an overcoat. Washcoat may include manganese as 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 TWC systems. ZPGM TWC systems may include high surface area, low conversion temperature catalysts that may exhibit high efficiency in the conversion of exhaust gases.
1 . An apparatus for reducing emissions from an engine having associated therewith an exhaust system, the apparatus leading to a reaction effective for selective catalytic reduction, comprising:
a catalyst system, comprising:
a substrate;
a washcoat suitable for deposition on the substrate, comprising at least one oxide solid selected from the group consisting of at least one of a carrier material oxide, and a zero platinum group metal (ZPGM) catalyst; and
an overcoat suitable for deposition on the substrate, comprising at least one overcoat oxide solid selected from the group consisting of at least one of a carrier material oxide, and a ZPGM catalyst.
2 . The apparatus of claim 1 , wherein the washcoat ZPGM catalyst comprises one or more elements selected from the group consisting of copper, cerium, and manganese, and wherein the washcoat carrier metal oxide comprises lanthanum doped alumina.
3 . The apparatus of claim 2 , wherein the washcoat further comprises an oxygen storage material comprising one or more elements selected from the group consisting of at least cerium, zirconium, neodymium, praseodymium, samarium, lanthanum, and yttrium.
4 . The apparatus of claim 2 , wherein the washcoat ZPGM catalyst comprises about 4% to about 20% by weight manganese.
5 . The apparatus of claim 1 , wherein the overcoat ZPGM catalyst comprises one or more elements selected from the group consisting of copper, cerium, and manganese, and wherein, when the overcoat is the carrier material oxide, it comprises lanthanum doped alumina.
6 . The apparatus of claim 5 , wherein the overcoat further comprises an oxygen storage material comprising one or more elements selected from the group consisting of at least cerium, zirconium, neodymium, praseodymium, samarium, lanthanum, and yttrium.
7 . The apparatus of claim 5 , wherein the overcoat ZPGM catalyst comprises about 10% to about 16% copper and about 10% to about 20% cerium.
8 . The apparatus of claim 1 , wherein the washcoat ZPGM catalyst comprises cerium, and wherein the overcoat is the ZPGM catalyst which comprises at least one element selected from the group consisting of at least copper and manganese.
9 . The apparatus of claim 8 , wherein the washcoat ZPGM catalyst comprises about 10% to about 20% by weight cerium.
10 . The apparatus of claim 1 , wherein the overcoat ZPGM catalyst comprises one or more elements selected from the group consisting of copper, and manganese, and wherein the overcoat carrier material oxide comprises lanthanum doped alumina.
11 . The apparatus of claim 10 , wherein the overcoat further comprises an oxygen storage material comprising one or more elements selected from the group consisting of cerium, zirconium, neodymium, praseodymium, samarium, lanthanum, and yttrium.
12 . The apparatus of claim 10 , wherein the overcoat ZPGM catalyst comprises about 4% to about 20% manganese and about 10% to about 16% copper.
13 . The apparatus of claim 1 , wherein the washcoat ZPGM catalyst comprises at least one element selected from the group consisting of cerium, and manganese, and the overcoat comprises copper.
14 . The apparatus of claim 13 , wherein the washcoat ZPGM catalyst comprises about 4% to about 20% by weight manganese.
15 . The apparatus of claim 1 , wherein the overcoat ZPGM catalyst comprises one or more elements selected from the group consisting of copper, and cerium, and wherein the overcoat carrier material oxide comprises lanthanum doped alumina.
16 . The apparatus of claim 15 , wherein the overcoat further comprises an oxygen storage material comprising one or more elements selected from the group consisting of cerium, zirconium, neodymium, praseodymium, samarium, lanthanum, and yttrium.
17 . The apparatus of claim 15 , wherein the overcoat ZPGM catalyst comprises about 10% to about 16% copper and about 10% to about 20% cerium.
18 . The apparatus of claim 1 , wherein the T50 conversion temperature for carbon monoxide is less than 310 degrees Celsius
19 . The apparatus of claim 1 , wherein the T50 conversion temperature for carbon monoxide is less than 300 degrees Celsius.
20 . The apparatus of claim 1 , wherein the T50 conversion temperature for nitrogen oxide is less than 400 degrees Celsius.
21 . The apparatus of claim 1 , wherein the T50 conversion temperature for hydrocarbons is less than 350 degrees Celsius.
22 . The apparatus of claim 1 , wherein the T50 conversion temperature for hydrocarbons is less than 400 degrees Celsius.
23 . The apparatus of claim 1 , wherein the washcoat ZPGM catalyst comprises manganese, and the overcoat comprises at least one element selected from the group consisting of copper, and cerium.