Process for the catalytic exhaust gas aftertreatment of engine combustion emissions
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsMichael Preis, Hans Fickel, Juergen Ringler
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Abstract
For the regeneration of an NOx storage catalyst by means of hydrogen in a secondary hydrogen process, the hydrogen required for the regeneration is taken from a primary hydrogen process.
Claims18
A process for catalytic exhaust gas aftertreatment of engine combustion emissions with an NOx storage catalyst which can be regenerated by feeding hydrogen to the exhaust gas upstream of the NOx storage catalyst, the process comprising feeding the hydrogen used in a secondary process for the regeneration and desorption of the NOx storage catalyst or adsorber catalyst from a primary hydrogen process.
2 The process according to claim 1, wherein, in the case of a motor vehicle whose internal-combustion engine can be operated in a primary hydrogen process with hydrogen, removing a partial quantity of hydrogen from the hydrogen flow fed to the internal-combustion engine and feeding the partial quantity to the exhaust gas flow upstream of the NOx storage catalyst.
An engine exhaust system comprising:
- an NOx storage catalyst which is regenerable by feeding hydrogen to the exhaust gas upstream of the NOx storage catalyst, wherein hydrogen is fed from a primary hydrogen process to a secondary process for the regeneration and desorption of the NOx storage catalyst or adsorber catalyst.
11 The system according to claim 10, wherein, in the case of a motor vehicle whose internal-combustion engine can be operated in a primary hydrogen process with hydrogen, a partial quantity of hydrogen is removed from the hydrogen flow fed to the internal-combustion engine and fed to the exhaust gas flow upstream of the NOx storage catalyst.
Dependencies are inferred from the claim text.