In this study, coaxial dielectric barrier discharge (DBD) plasma, in conjunction with a metal oxide catalyst, was used to degrade naphthalene. The characteristics of plasma discharge were studied by measuring voltage and current waveforms and the Lissajous figure. The effects of different parameters of the process on naphthalene decomposition in air were investigated. XRD, BET, and SEM data were used to investigate the nature, specific surface area, and surface morphology of the catalyst. The results show that the mineralization of naphthalene reached 82.2% when the initial naphthalene concentration was 21 ppm and the total gas flow rate was 1 L/min in the DBD reactor filled with Al₂O₃. The mineralization of naphthalene first increased and then became stable with the increase in treatment time and discharge power. The TiO₂ catalyst has more apparent advantages than the two other studied catalysts in terms of the removal efficiency and mineralization of naphthalene due to this catalyst’s large specific surface area, porous structure, and photocatalytic properties. In addition, the introduction of a small amount of water vapor can promote the mineralization and CO₂ selectivity of naphthalene. With further increases in the water vapor, Fe₂O₃ has a negative effect on the naphthalene oxidation due to its small pore size. The TiO₂ catalyst can overcome the adverse effects of water molecule attachment due to its photocatalytic properties.

中文翻译：

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大气压下介电势垒放电与催化剂结合分解萘

在这项研究中，同轴介质阻挡放电 (DBD) 等离子体与金属氧化物催化剂一起用于降解萘。通过测量电压、电流波形和李萨如图形，研究了等离子体放电的特性。研究了不同工艺参数对萘在空气中分解的影响。XRD、BET和SEM数据用于研究催化剂的性质、比表面积和表面形态。_{结果表明，在填充Al 2} O ₃的DBD反应器中，当初始萘浓度为21 ppm、总气体流速为1 L/min时，萘的矿化率达到82.2%。. 随着处理时间和放电功率的增加，萘矿化先增加后趋于稳定。TiO ₂催化剂由于其较大的比表面积、多孔结构和光催化性能，在萘的去除效率和矿化方面比其他两种研究的催化剂具有更明显的优势。此外，少量水蒸气的引入可以促进萘的矿化和CO ₂选择性。随着水蒸气的进一步增加，Fe ₂ O ₃由于其孔径较小，对萘的氧化产生负面影响。_二氧化钛催化剂由于其光催化性能可以克服水分子附着的不利影响。