Daimler Ag

Claudia Essmann

Alexander Massner

Uwe Gaertner

Michael Stiller

Johannes Bleckmann

In an exhaust system for a motor vehicle having an exhaust treatment device for after-treating exhaust gas of a combustion engine of the motor vehicle, the exhaust gas treatment device includes a first SCR catalyst, which has a zeolite material containing copper, an ammonia slip catalyst, which is arranged downstream of the first SCR catalyst, and a particulate filter. A second SCR catalyst, which has an SCR catalyst material containing vanadium, is arranged upstream of the first SCR catalyst.

Exhaust system for a motor vehicle

An exhaust gas after-treatment unit for an internal combustion engine, particularly for a motor vehicle, includes a first selective catalytic reduction (SCR) catalytic converter through which the exhaust gas from the internal combustion engine can flow and at least one particle filter for retaining the soot particles from the exhaust gas. The particle filter, which is located downstream from the first SCR catalytic converter, is equipped with a heavy metal and precious metal free catalyzing coating which oxidizes the soot particles retained by the particle filter, where downstream from the particle filter there is a second SCR catalytic converter through which the exhaust gas can flow.

Exhaust gas after-treatment unit for an internal combustion engine and procedure for using a drive mechanism with such an exhaust gas after-treatment unit

An exhaust gas after-treatment unit includes a first catalytic converter, a particle filter arranged downstream of the first catalytic converter, and a second catalytic converter arranged downstream of the particle filter and which is a selective catalytic reduction (SCR) catalytic converter. The first catalytic converter is a combination catalytic converter including a first catalytic converter part which is an SCR catalytic converter, a second catalytic converter part arranged downstream of the first catalytic converter part which is an ammonia slip catalytic converter and has a noble metal layer with a first noble metal content, a third catalytic converter part arranged downstream of the second catalytic converter part which is an oxidation catalytic converter and has a noble metal layer with a second noble metal content, and an SCR layer arranged on the noble metal layers and extending over the entire length of the second and third catalytic converter parts.

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Stuttgart, Germany

Claudia Essmann