1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144 
Row SCR works
Page 14
If you've noticed an error in this article please click here to report it so we can fix it.
m Urea is non-toxic, colourless and odourless. The SCR system is made up of an additional tank and electronic metering unit for the reducing agent—prototypes have featured a OSlitre tank positioned directly adjacent to the main fuel tank—and a ceramic catalyst housed in the silencer.
Nitrogen oxides are reduced in the catalytic converter via ammonia created from the addition of aqueous urea solution to the hot exhaust gases. The precise quantity metered is calculated by the engine's electronics system and on average will be around 6% of the diesel fuel used.
ilaimlerChrysler is already working with mineral oil suppliers on ways in which to ensure the general availability of urea in time for the introduction of Euro-4. The spokesman says the urea solution will be probably be distributed via current fuel suppliers.