Patent ID: 7003946

Claim:
A process for catalytic exhaust gas aftertreatment of engine combustion emissions with an NO x storage catalyst which is regenerable by feeding hydrogen to the exhaust gas upstream of the NO x storage catalyst, the process comprising feeding the hydrogen used in a secondary process for the regeneration and desorption of the NO x storage catalyst or adsorber catalyst from a primary hydrogen process, wherein, in the case of a motor vehicle whose internal-combustion engine is operated with only hydrocarbon and in the case of which, by a reformer, a hydrogen-rich synthetic gas is generated from hydrocarbon for the operation of a fuel cell in a primary hydrogen process; extracting a partial quantity of hydrogen from the primary process and feeding the partial quantity to the exhaust gas flow upstream of the NO x storage catalyst; and downstream of the NO x storage catalyst condensing water vapor contained in the exhaust gas and feeding it to a hydrogen production process.