湿度对介质阻挡放电降解甲苯的影响

Effect of Humidity on Toluene Decomposition in Dielectric Barrier Discharge Reaction

摘要: 采用介质阻挡放电作为低温等离子体的产生方式,研究了湿度在介质阻挡放电降解甲苯中的影响,考察了不同背景气氛以及有无催化剂时湿度对甲苯去除的影响.实验结果表明,无催化剂以及反应气氛中氧的体积分数为5.00％的N₂时,最佳湿度为0.20％.无催化剂以及反应气氛中氧的体积分数为0.05％时,水汽的加入降低了对甲苯的去除效率;反应气氛中氧气的体积分数≥5.00%时,水汽的加入提高了对甲苯的去除效率.当有催化剂存在时,水汽的加入降低了对甲苯的去除效率.

Abstract: Dielectric barrier discharge (DBD) was used to produce non-thermal plasma, and the effect of humidity on toluene decomposition studied. In addition, the effect of humidity under different background gases and with/without catalyst on toluene removal was studied. It was found that when no catalyst existed and the background gas was N₂ containing 5.00% O₂, the optimum humidity was 0.20%. When the oxygen content in the background gas was very low(0.05％O₂) or when a catalyst was introduced into the discharge area, adding water would decrease the toluene removal efficiency. However, when the oxygen content was high enough(≥5.00%), the situation tend to be reversed.