Claims
- 1. An engine exhaust gas purification device, comprising:a porous body of catalytic material disposed in an exhaust gas stream of an engine, wherein said porous body of catalytic material is catalytically active above 200° C. to reduce pollutants in the presence of a reducing agent, and said porous body of catalytic material stores at least 20% by volume hydrocarbons below 200° C., wherein the catalytic material is a material of the chemical formula A1a1(1−x)A2a2(1−x)BbO4, wherein A1 and A2 are independently selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Sn and Ti, with a1+a2+b≦3, with a1>0, a2>0, b>0 and 0≦x<1, and B represents Al.
- 2. The purification device of claim 1, wherein the catalytic material has at least microscopically a crystallographic or crystalline cubic lattice structure with face-centered oxygen ions and with tetrahedral and octahedral gaps,wherein the at least one of A1 and A2 and up to 50% of aluminum is disposed in the tetrahedral gaps and wherein the remaining aluminum is disposed in the octahedral gaps.
- 3. The purification device of claim 1, wherein the catalytic material is a material of the chemical formula A1a1(1−x)A2a2(1−x)B2O4, wherein A1 and A2 are independently selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Sn and Ti, with a1+a2≦1, a1>0, a2>0 and 0≦x<1 and B represents Al.
- 4. The purification device of claim 1, wherein the catalytic material is a material of the chemical formula A10.5(1−x)A20.5(1−x)B2O4, wherein A1 and A2 are independently selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Sn and Ti, with 0≦x<1 and B represents Al.
- 5. The purification device according to claim 1, wherein the porous body of catalytic material comprises a catalyst comprising at least one catalytically active element selected from palladium, platinum, rhodium, ruthenium, osmium, iridium, rhenium lanthanum, cerium, vanadium, titanium, niobium molybdenum, tungsten, salts thereof and oxides thereof.
- 6. The purification device of claim 1, wherein the catalytic material stores at least 50% by volume of hydrocarbons below 200° C.
- 7. An engine exhaust gas purification device, comprising:a porous body of catalytic material disposed in an exhaust gas stream of an engine, wherein said porous body of catalytic material is catalytically active above 200° C. to reduce pollutants in the presence of a reducing agent, and said porous body of catalytic material stores at least 20% by volume hydrocarbons below 200° C., wherein the catalytic material is selected from the group consisting of (MgCu)Al2O4, (CuCu)Al2O4, (CuZn)Al2O4, and (CoZn)CuAl2O4.
- 8. An engine exhaust gas purification device, comprising:a porous body of catalytic material disposed in an exhaust gas stream of an engine, wherein said porous body of catalytic material is catalytically active above 200° C. to reduce pollutants in the presence of a reducing agent, and said porous body of catalytic material stores at least 20% by volume hydrocarbons below 200° C., wherein the catalytic material is a mixture of (ZnCu)Al2O4 with at least one of WO3, V2O5, or TiO2.
- 9. An engine exhaust gas purification device, comprising:a porous body of catalytic material disposed in an exhaust gas stream of an engine, wherein said porous body of catalytic material is catalytically active above 200° C. to reduce pollutants in the presence of a reducing agent, and said porous body of catalytic material stores at least 20% by volume hydrocarbons below 200° C., wherein the catalytic material is selected from the group consisting of Mg0.5Cu0.5Al2O4, Cu0.5Cu0.5Al2O4, Cu0.5Zn0.5Al2O4, Co0.25Zn0.25Cu0.5Al2O4 and mixtures of these compounds with 10% WO3 and at least one of 6% V2O5, 84% TiO2, or Al2O3.
- 10. An engine exhaust gas purification device, comprising:a porous body of catalytic material disposed in an exhaust gas stream of an engine, wherein said porous body of catalytic material is catalytically active above 150° C. to reduce pollutants in the presence of a reducing agent, and said porous body of catalytic material stores at least 20% by volume hydrocarbons below 150° C., wherein the catalytic material is a material of the chemical formula A1a1(1−x)A2a2(1−x)BbO4, wherein A1 and A2 are independently selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Sn and Ti, with a1+a2+b≦3, with a1>, a2>0, b>0 and 0≦x<1, and B represents Al.
Priority Claims (1)
Number |
Date |
Country |
Kind |
195 46 484 |
Dec 1995 |
DE |
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Parent Case Info
This application is a division of application Ser. No. 08/764,465 filed Dec. 12, 1996 now U.S. Pat. No. 6,027,703.
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