Perovskite-type metal oxide compounds and methods of making and using thereof
First Claim
1. A method of reducing nitrogen oxides, oxidizing carbon monoxide, and oxidizing hydrocarbons in an exhaust stream from a motor vehicle, said method comprising:
- contacting the exhaust stream with a perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula;
Aa-xBxMObwhereinA is a mixture of elements originally in the form of a single phase mixed lanthanide collected from bastnasite;
B is a divalent or monovalent cation;
M is at least one element selected from the group consisting of elements of an atomic number of from 22 to 30, 40 to 51, and 73 to 80;
a is 1 or 2;
b is 3 when a is 1 or b is 4 when a is 2; and
x is a number defined by 0≦
x<
0.7.
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Accused Products
Abstract
Perovskite-type catalyst consists essentially of a metal oxide composition and methods of using them are provided. The metal oxide composition is represented by the general formula Aa−xBxMOb, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0≦x<0.5. Methods of making and using the perovskite-type catalysts are also provided. The perovskite-type catalyst may be used to reduce nitrogen oxides, oxidize carbon monoxide, and oxidize hydrocarbons in an exhaust stream from a motor vehicle. Methods of such a use are provided.
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Citations
20 Claims
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1. A method of reducing nitrogen oxides, oxidizing carbon monoxide, and oxidizing hydrocarbons in an exhaust stream from a motor vehicle, said method comprising:
- contacting the exhaust stream with a perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula;
Aa-xBxMObwherein A is a mixture of elements originally in the form of a single phase mixed lanthanide collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 22 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0≦
x<
0.7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- contacting the exhaust stream with a perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula;
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17. A method of purifying industrial process emissions containing hydrocarbons, carbon monoxide, and nitrogen oxides, the method comprising:
- contacting said emissions with a perovskite-type catalyst, thereby purifying said emissions, said perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula;
Aa-xBxMObwherein A is a mixture of elements originally in the form of a single phase mixed lanthanide collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 22 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0≦
x<
0.7.- View Dependent Claims (18, 19, 20)
- contacting said emissions with a perovskite-type catalyst, thereby purifying said emissions, said perovskite-type catalyst consisting essentially of a metal oxide composition represented by the general formula;
Specification