Superposition Effect on Ozone Synthesis by Two Types of Discharges

Abstract

At present, the silent discharge is mainly used for ozone synthesis with ozonizers. And it is known that the surface discharge is also an effective means for ozone synthesis. Then we made a ozonizer in which the silent discharge and the surface discharge can be superposed, and studied the characteristics of ozone synthesis when different discharges were superposed. The discharge tube which was used in this study was consisted of an inner and an outer coaxial pyrex tube. The outer tube was rolled in aluminum foil which used as a HV electrode for the silent discharge. Besides a 20% salt solution was enclosed in the inner tube and Nickel rod was put at the center of the tube and used as a HV electrode for the surface discharge. The inner tube was rolled in spiral Nickel wire which used as a ground electrode for both discharges. Oxygen was flowed between the inner and the outer tube. The experiment was done at the following conditions. We changed the phase difference of both discharge voltages on condition (3).
(1) The case only the silent discharge was generated
(2) The case only the surface discharge was generated
(3) The case simultaneous discharge of both discharges were generated. The result was that the yield efficiency of ozone by simultaneous discharge increased from the phase difference of 0° to 90° and from 180° to 270°, on the other hand decreased from 90° to 180° and from 270° to 360° as the phase difference increased. In other words, at the phase difference of 90° and 270°, the yield efficiency of ozone by simultaneous discharge was the largest value and more than the sum of yield efficiency of ozone by several discharges by about 20%. We could confirm by this result and the confirmation experiment that the yield efficiency of ozone increased as the stoppage time of discharge got shorter.