We have determined that Na
2O
2 solution is very effective as an absorption solution for NO
x removal at extremely low concentrations of NO
x. In order to attain Environmental Quality Standard (EQS) for NO
x by regulating only NO
x from stationary and mobile emmission sources the regulation must be very severe.
The regulation will be desirable when, in addition to the emission source regula-tion, one removes NO
x only in areas having very high concentrations locally higher than the EQS.
The absorption efficiency of NO
x depends on the concentration of both H2O2 and NaOH in the solution.
Concentrations higher than 2g H
2O
2/
l and 8g NaOH 1/
l were needed.
We conducted experiments using a small apparatus, which had absorption units with glass fiber cloths set up parallel to the sample gas flow and in which the Na2O2 solution was circulated and sprinkled over the units. The Na
2O
2 solution containing H
2O
2 higher than 5g/
l abruptly lowered the absorption efficiency when the NaOH concentration became lower than 12g/
l NaOH was consumed by reaction with CO
2 to form Na
2O
2 and NaHCO
3 and the absorption efficiency gradually decreased. The absorption power significantly by using two units, one for CO
2 absorption and the other for NO
x.
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