Robert Boschgmbh

Martin Bohnet

Markus Gloeckle

Norbert Breuer

Buenyamin Duru

The invention relates to a catalyst arrangement in an exhaust gas after-treatment system of an internal combustion engine comprising an exhaust gas line in which an SCR catalyst is positioned in the direction of flow of the exhaust gas. A reducing agent production system has an NOx and CO/H2 production unit and a combined NOx storage/ammonia production unit in the standard gas-carrying path of the reducing agent production system which supplies ammonia as the reducing agent. The NOx and CO/H2 production unit is at least temporarily supplied via a fuel supply and an air supply with starting products for producing ammonia. The combined NOx storage/ammonia production unit has a plurality catalyst sections having different characteristic properties or functionalities, enabling a higher ammonia yield in the combined NOx storage/ammonia production unit. The catalyst formulations make it possible to adjust a temperature profile that additionally influences the ammonia production rate and contributes to higher ammonia yields.

Catalytic converter assembly in an exhaust gas posttreatment system

A method of and apparatus for controlling the reducing agent in an exhaust gas aftertreatment system of an internal combustion engine with an exhaust gas duct in which an SCR catalyst is provided in the direction of flow of the exhaust gas. A reducing agent-generating system (RGS) comprising an NOx and CO/H2 production unit as well as a combined NOx storage/ammonia production unit in the standard gas path of the reducing agent-generating system. Ammonia is delivered upstream from the SCR catalyst to reduce nitrogen oxides, starting materials for producing the ammonia being fed at least in part to the NOx and CO/H2 production unit via a fuel inlet and an air inlet. An AGC matrix of the combined NOx storage/ammonia production unit is cooled at least intermittently by means of an inner and/or outer cooling device. Cooling results in the longest possible section of the running length (L) and thus the largest possible volume percent of the AGX matrix within the combined NOx storage/ammonia production unit having an optimum temperature range regarding the highest possible ammonia yield, which overall contributes to a great ammonia production rate.

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Goeppingen, Germany

Martin Bohnet