Component Description For Scr Catalytic Converter - Mercedes-Benz OM 471 Introduction Into Service Manual

GF49.10>W>3008HA
ENGINES 471.9 in MODEL 963, 964 with CODE (M5Y) Engine version Euro V
ENGINES 471.9 in MODEL 963, 964 with CODE (M5R) Engine version EEV
Location
2 Ammonia slip catalytic converter
3 SCR catalytic converter
A57 EATU output NOx sensor control
unit
A57 b1 EATU output NOx sensor
A67 AdBlue" metering device
A70 EATU input NOx sensor control unit
A70 b1 EATU input NOx sensor
B72 Exhaust temperature sensor
upstream of SCR catalytic converter
B73 Exhaust temperature sensor
downstream of SCR catalytic
converter
The SCR catalytic converter (3) is located in
the exhaust aftertreatment unit and forms
one unit together with the ammonia slip
catalytic converter (2).
Task
The poisonous nitrogen oxides (NOx) generated during
combustion are reduced into non>toxic nitrogen (N
(H O) in the SCR catalytic converter (3). The ammonia slip catalytic
2
converter (2) is primarily used to the convert ammonia particles
(NH ) that have not reacted, which would otherwise be easy to
3
detect in the vehicle environment due to the low odor threshold
of ammonia.
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >

Component description for SCR catalytic converter

) and water
2
– This printout will not be recorded by the update service. Status: 09 / 2011 –
System components
Design
The SCR catalytic converter (3) and the ammonia slip catalytic
converter (2) consist of two cylindrical catalytic converter
elements connected in series in a sheet metal envelope. To permit
the chemical reaction, this ceramics block is fitted with a special
coating made from a series of rare metals such as titanium,
tungsten, platinum and vanadium.
2.8.11
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