| dc.description.abstract | With an oxidation potential second only to fluorine, ozone is a strong oxidizing agent that has been applied in many areas such as water disinfection, flue gas treatment, food processing, indoor air cleaning, and so forth. However, the cost of ozone generators is still high. Combination of non-thermal plasma (NTP) with heterogeneous catalysis, referred to as plasma-catalysis, has gained much interest during the last 20 years. However, few works on O3 generation via plasma catalyst system have been reported. In this work, a novel catalyst-based plasma system for ozone generation was developed. Based on the analysis of different operating parameters and catalyst surface characteristics, the mechanism of ozone synthesis in plasma catalytic system is discussed. In this study, glass beads, alumina balls, silicone and titanium dioxide with the same diameter of 3 mm were used as filled dielectric materials for comparison. The results indicate that TiO2 has better performance and higher ozone concentration of 73 gO3 / m3. The highest energy efficiency is 140 gO3 / kWh. The advantages of TiO2-based compared to others include: (1) higher dielectric constant (up to about 110-117), (2)the higher light intensity absorption characteristics, (3)the photocatalytic mechanism. Factors that affect the ozone production efficiency and concentration are studied, and the best operating parameters of the experiment contain the applied voltage of 18 kV, the frequency of 15 kHz, the discharge length of 200 mm and the discharge gap of 6 mm. Subsequent research under the same operating conditions, the installation of a cooling system reduces system temperature, which increases ozone generation concentration. The follow-up experiment was to explore the influence of different feed gas composition, and further modify the titanium dioxide particles to form the modified TiO2 catalyst, which increase the absorption of visible light to facilitate photocatalytic activity. Nitrogen can slightly increase the ozone concentration, but a small amount of argon doesn’t increase the ozone concentration. Compared with the different catalysts, filling modified TiO2 in the plasma reaction system has the best performance and stability. The maximum energy efficiency of the plasma catalysis system is 415 gO3 / kWh, which has better energy efficiency than most studies. Therefore, it is believed that this catalyst can effectively improve the efficiency of the plasma catalysis system for ozone generation. | en_US |