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0.25
2500
H
2
2000
0.20
0.15
CO
1500
O
2
Temp
0.10
1000
H
2
O
C
3
H
8
C
2
H
2
500
0.05
C
2
H
4
CO
2
0
0
1.79
1.8
1.81
1.82
1.83
Time, s
FIGURE 2.64
Temporal profiles of temperature and main stable species around “ignition”
at φ = 5.
5
C
3
H
4
P
4
3
C
4
H
4
C
8
H
6
C
7
H
8
2
C
3
H
4
1
0
0
2
4
6
8
Time, s
FIGURE 2.65
Temporal profiles of some important species in the first 8 s of PAH formation
mechanism at φ = 5.
→ CH
2
CO + HCCO. Only a small fraction of C
4
H
4
will later contribute to the
formation of benzene through R382. Along with C
3
H
4
and C
3
H
4
P, C
3
H
5
is formed
from C
2
H
4
through R523 and from C
3
H
6
through R495. Reactions of C
3
H
5
(R520,
the first aromatic species form. After the first stage, the reactions proceed at slower
rates through much longer time intervals. Reaction R530, which in the first stage
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