Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

Abstract

Dielectric barrier discharge (DBD), a non-thermal plasma(NTP)technology, has a wide range of environmental applications. In this study, TiO 2 , SiO 2 , and Al 2 O 3 were coated on the surface of a quartz dielectric using a dip-coating method. The catalyst coating coatings effectively improved the local discharge intensity, thus enhancing the generation of reactive species. After discharge by the DBD system, the O atom in the middle of TiO 2 crystal is replaced by N atom doping, and the Al = O and Al OH groups on the surface of Al 2 O 3 increase. All Catalyst coating surfaces contained a small number of hydroxyl groups. TiO 2 and Al 2 O 3 surfaces had fewer oxygen vacancies. thus making O 3 synthesis dominant at the gas-solid interface.1 Introduction Dielectric barrier discharge (DBD) is a non-equilibrium gas discharge generated by placing a dielectric barrier between two electrodes. The dielectric material can be coated on the electrode surfaces or suspended within the discharge space. DBD is a reliable and cost-effective method for generating nonthermal plasma (NTP). It can be operated over a wide range of voltage frequencies (from 50 Hz to 1 MHz, alternating current) and gas pressures (from 10 4 Pa to 10 6 Pa). As a result, DBD has a wide range of applications in various elds, including material modi cation, wastewater treatment, medical treatments, and industrial production [1][2][3] . Studies have demonstrated that the synthesis of ozone in the generator can be effectively enhanced by coupling DBD with catalysts [4,5] .One of the main methods of coupling DBD with catalysts is by lling the discharge region of the DBD generator with spherical or irregularly shaped dielectric particles, forming a packed-bed dielectric barrier discharge (PB-DBD) [6][7][8] . Hafeez et al. [9]investigated a novel corona PB-DBD generator by lling the discharge region with dielectric glass beads and compared its ozone synthesis performance with an empty-bed generator. The results showed that the packed-bed plasma generator increases ozone production by approximately 24% under optimized conditions compared with the empty-bed generator. J.Wang et al. [10] lled the generator with metal oxide powders as catalysts and study the effects of catalyst powders on O 3 synthesis and decomposition.. The results showed that FeO, CuO, and ZnO can effectively promote O 3 synthesis whereas MnO 2 and Fe 2 O 3 promoted ozone decomposition rather than synthesis. Meng Li et al. [11] integrated ZnO powder into a hybrid discharge (HD) reactor to investigate the effect of ZnO powder surface reaction on ozone synthesis. The results show that the use of ZnO powder for the optimal conditions with a discharge power of 0.4-3.3 W leads to an average increase of 28% and 26% in O 3 concentration and HD yield, respectively, and the enhanced O 3 synthesis in HD-ZnO is mainly attributed to the strong surface reaction catalyzed by the coating in the O2 plasma. S. Said et al. [12] lled alumina particles into the generator to study the reaction mechanism of ozone synthes...