Claims
- 1. An exhaust gas purifying catalyst comprising:a carrier; a catalyst layer; and an inhibiting layer formed between said catalyst layer and said carrier; wherein at least one material selected from alkali metals is contained in the catalyst layer as an absorbent agent; wherein an acid material with a high affinity with respect to said absorbent agent is mixed in said catalyst layer; and wherein the inhibiting layer inhibits movement of said absorbent agent toward said carrier.
- 2. An exhaust gas purifying catalyst according to claim 1, further comprising:a second catalyst layer formed on an external surface of said catalyst layer; and wherein at least one material selected from alkali metals contained in the second catalyst layer as an absorbent agent.
- 3. An exhaust gas purifying catalyst according to claim 1, further comprising:a second catalyst layer formed between said catalyst layer and said inhibiting layer; and wherein at least one material selected from alkali metals contained in the second catalyst layer as an absorbent agent.
- 4. An exhaust gas purifying catalyst according to claim 1, wherein said acid material or said inhibiting layer is composed of at least one of the following materials:an acid oxide including at least one acid substance selected from a group consisting of Group-IV, Group-V and Group-VI transition elements, and Group-IV, Group-V and Group-VI non-transition elements; a complex oxide including said at least one acid substance; a material that does not inhibit reaction of a nitrogen oxide and said absorbent agent; and a material that absorbs a reduced substance.
- 5. An exhaust gas purifying catalyst according to claim 1,wherein said acid material is composed of zeolite; and wherein said inhibiting layer is composed of silica (SiO2).
- 6. An exhaust gas purifying catalyst according to claim 1, wherein said inhibiting layer is composed of at least one of the following materials:a layer with a high acidity, a layer with a large specific surface area, a layer with a small crystal lattice, a layer composed of a compound, and a layer with a high alkalinity.
- 7. An exhaust gas purifying catalyst according to claim 1,wherein said absorbent agent includes potassium (K); and wherein said carrier is composed of a porous carrier.
- 8. A method of manufacturing an exhaust gas purifying catalyst comprising:forming a carrier; forming an inhibiting layer on the carrier; and forming a catalyst layer on the inhibiting layer; wherein at least one material selected from alkali metals is added to the catalyst layer as an absorbent agent; wherein an acid material with a high affinity with respect to said absorbent agent is mixed in said catalyst layer; and wherein the inhibiting layer inhibits movement of said absorbent agent toward said carrier.
- 9. A method of manufacturing an exhaust gas purifying catalyst according to claim 8, further comprising:forming a second catalyst layer on an external surface of said catalyst layer; and wherein at least one material selected from alkali metals is added to the second catalyst layer as an absorbent agent.
- 10. A method of manufacturing an exhaust gas purifying catalyst according to claim 8, further comprising:forming a second catalyst layer between said catalyst layer and said inhibiting layer; and wherein at least one material selected from alkali metals is added to the second catalyst layer as an absorbent agent.
- 11. A method of manufacturing an exhaust gas purifying catalyst according to claim 8, wherein said acid material or said inhibiting layer is composed of at least one of the following materials:an acid oxide including at least one acid substance selected from a group consisting of Group-IV, Group-V and Group-VI transition elements, and Group-IV, Group-V and Group-VI non-transition elements; a complex oxide including said at least one acid substance; a material that does not inhibit reaction of a nitrogen oxide and said absorbent agent; and a material that absorbs a reduced substance.
- 12. A method of manufacturing an exhaust gas purifying catalyst according to claim 8,wherein said acid material is composed of zeolite; and wherein said inhibiting layer is composed of silica (SiO2).
- 13. A method of manufacturing an exhaust gas purifying catalyst according to claim 8, wherein said inhibiting layer is composed of at least one of the following materials:a layer with a high acidity, a layer with a large specific surface area, a layer with a small crystal lattice, a layer composed of a compound, and a layer with a high alkalinity.
- 14. A method of manufacturing an exhaust gas purifying catalyst according to claim 8,wherein said absorbent agent includes potassium (K); and wherein said carrier is composed of a porous carrier.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-216313 |
Jul 2000 |
JP |
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Parent Case Info
This application conformation of Ser. No. 09/907,472 filed on Jul. 17,2001
US Referenced Citations (21)
Foreign Referenced Citations (3)
Number |
Date |
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0 931 590 |
Jul 1999 |
EP |
1 004 347 |
May 2000 |
EP |
1 008 378 |
Jun 2000 |
EP |
Continuations (1)
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Number |
Date |
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Parent |
09/907472 |
Jul 2001 |
US |
Child |
10/452206 |
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US |