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NOx Emission and Its Control
- Nitrogen in atmosphere forms 8 different oxides during combustion.
- The important oxides are NO,
 .
- Is NO harmful to health than
 ?
 is more harmful as compared to NO. By what reaction NO and
 are formed ?
 - For any chemical reaction, Gibbs free energy
 attains a minimum value for a particular temperature and pressure
|
| |
|
 Equilibrium constant
|
| |
 Standard Gibbs free energy change
|
| Table: Equilibrium concentration of NO and NO2 |
 |
|
|
|
|
|
300
|
7 X 10-31
|
1.4 X 106 |
3.4 X 10-10 |
2 X 10-4 |
500
|
2.7 X 10-18 |
130 |
7 X 10-4
|
0.04
|
1000
|
7.5 X 10-9 |
0.11
|
35
|
1.9
|
1500
|
1.07 X 10-5 |
0.011
|
1320
|
6.8
|
2000
|
0.0004
|
0.0035
|
8100
|
13.2
|
2500
|
0.0035
|
0.0018
|
24000
|
20.0
|
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