In present research, experiments using a diffuse glow discharge, which is one of non-thermal plasma, were carried out to remove NO
x. To generate diffuse glow discharge a double discharge method was used and it was consisted of two discharges, pre-discharge and main discharge. The pre-discharge produces many initial electrons around cathode and generates the main discharge easily at atmospheric pressure.
The experiments employed two kinds of sample gas, NO/N
2 mixture and NO/N
2/O
2 mixture gas, with several different NO concentrations for removing N
Ox, and adjusted at 1.25 [l/min] for all measurements. Using NO/N
2 mixture gas a reduction rate of NO decreased with increasing initial NO concentration. Thus the present NO
x reactor can remove efficiently at the region of low NO
x concentration. Nevertheless, an energy yield of NO removal improved and reached 8.82 [mg/Wh] at initial NO value of 186 [ppm] which is about 5 or 6 times comparing to conventional discharge methods. Steepness of main voltage was important factor for removing NO
x. With NO/N
2/O
2 mixture gas the reduction rate of NO reached 100 [%] at O
2 mixture rate of 20[%] because NO oxidation was accelerated drastically by generated ozone together with O atoms. The energy yield of NO removal was 21.9 [mg/Wh] which is about 2.5 times higher than one of NO/N
2 mixture gas.
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