7 - MAINTENANCE
Selective Catalytic Reduction (SCR) catalyst
The main reaction involved in the SCR catalyst is the con-
version of the NO
x
to N
2
and water (H
2
O). An average
NO
2
/NO
x
ratio around 50% is required to give the opti-
mum NO
x
reduction efficiency in the exhaust system.
Excess of ammonia (NH
3
) is often used to facilitate the
NO
x
reduction to nitrogen (N
2
), resulting in NH
3
slip. This
ammonia must be removed by a secondary step in the
Clean Up Catalyst (CUC).
LEIL14WHL0450AA
4
621G
LEIL13WHL0252AB
5
721G
7-25
Содержание 621G Stage IV
Страница 42: ...2 SAFETY INFORMATION Empty tool LEEN11T0024AA 20 2 22 ...
Страница 60: ...2 SAFETY INFORMATION 2 40 ...
Страница 137: ...3 CONTROLS AND INSTRUMENTS Inducement and validation re starts LEIL14WHL0394HA 2 3 77 ...
Страница 138: ...3 CONTROLS AND INSTRUMENTS Validation re start procedure LEIL15WHL0608HA 3 3 78 ...
Страница 150: ...3 CONTROLS AND INSTRUMENTS 3 90 ...
Страница 166: ...4 OPERATING INSTRUCTIONS RCPH10WHL045BAH 7 4 16 ...
Страница 168: ...4 OPERATING INSTRUCTIONS RCPH10WHL045BAH 9 4 18 ...
Страница 170: ...4 OPERATING INSTRUCTIONS RCPH10WHL045BAH 12 4 20 ...
Страница 208: ...6 WORKING OPERATIONS 6 18 ...
Страница 227: ...7 MAINTENANCE DEF AdBlue level faults failures and engine power loss levels LEIL15WHL0607HA 2 7 19 ...
Страница 228: ...7 MAINTENANCE DEF AdBlue quality faults failures and engine power loss levels LEIL15WHL0609HA 3 7 20 ...
Страница 229: ...7 MAINTENANCE DEF AdBlue technical faults LEIL14WHL0392HA 4 7 21 ...
Страница 370: ...7 MAINTENANCE 7 162 ...