Abstract
As a fundamental study for removal of nitrogen oxide by non-thermal plasma, the particle growth process is investigated in the pulsed positive corona discharge in the mixed gas of N2, O2, H2O, NO and NH3. From the ESCA and TEM analysis of sampled particles, the generated particles are confirmed to be NH4NO3. From the measurement of particle size distribution, it is clarified that i) the diameter of the generated particles distributes around the peak at about 50nm, and ii) an addition of water vapor enhances the particle growth. Because the NH4NO3 particle is deliquescent, it exist in a liquid phase in the humid air. The fact will cause the better NOx reduction efficiency and the larger particle growth due to the action liquid phase reaction in the humid air.
