The purpose of this study is to improve NOx removal by combining surface discharge and TiO
2. Especially, this paper was discussed about the effect of TiO
2 to NOx removal in case of mixing oxygen. The reactor had structure that luminescence of surface discharge was irradiated to TiO
2. Therefore it was expected that TiO
2 was activated by UV rays included in luminescence of surface discharge. TiO
2 was used in the form of porous sheet mixed particle of Teflon and TiO
2. The experiment was carried out to measure NOx concentration in case of changing discharge power and O
2 concentration. As a result, NOx removal performance was improved by using TiO
2. From this matter, it was found that TiO
2 was activated by luminescence of surface discharge. In the effect of oxygen to TiO
2, NOx removal of TiO
2 increased with increasing O
2 concentration. The reason is that the amount of O
2- generated on TiO
2 surface increases. From the point of by-product, NO
2 was not generated in case of using TiO
2. It was considered that generated NO
2 by discharge was adsorbed to inside of TiO
2 sheet that had porous structure.
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