Purification device for gases
AssigneesDaimlerChrysler AG, BASF SE
InventorsMartin Hartweg, Rolf-Dirc Roitzheim, Andrea Seibold, Leonhard Walz, Thomas Fetzer, Bernd Morsbach
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Abstract
An exhaust gas purification device includes a porous body of catalytic material of the general formula AaBbO4 disposed in an exhaust gas stream of an engine. The porous body of catalytic material has a characteristic response temperature above which it is catalytically active to reduce pollutants in the presence of a reducing agent. The porous body stores at least 20% by volume hydrocarbons at temperatures below the response temperature. A represent at least one element selected from Mg, Ca, Mn, Fe, Ni, Co, Cu, Zn, Sn, Ti and A+B is less than 3, A is greater than 0 and B greater than 0.
Claims10
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.