非热平衡等离子体过程萘的降解

Naphthalene decomposition by non-thermal plasma process

应用电晕放电自由基簇射技术,对放电电压、初始浓度和催化剂对萘降解特性的影响进行了研究,分析了萘的降解产物和降解途径.结果表明,放电电压的增加有助于萘的降解率的提高.萘初始浓度的增加降低了萘的降解率,但提高了萘的脱除量.对于初始浓度17mg/m3的萘,14kV放电电压下能达到70%的降解率.MnO2和Fe2O3催化涂层均能促进萘的降解,且MnO2的催化活性要高于Fe2O3.在湿电极气下,催化涂层对萘降解的促进作用比干电极气更加显著.萘的降解产物主要是CO2,但是由于氧化反应的不完全性,也有少量的CO以及小分子有机物生成.

Using the corona free radical shower technique, the influence of applied voltage, initial concentration and catalyst on the naphthalene degradation characteristics was studied, and the degradation product and way were analyzed. The increasing discharge voltage was helpful to the enhancement of naphthalene degradation rate. The increase of initial concentration of naphthalene lowered its degradation, but enhanced its removed amount. On the 17mg/m^3 initial concentration of naphthalene, the degradation rate could reach 70% under 14 kV discharge voltage. The MnO2 and Fe2O3 catalytic coating could all promote the degradation of naphthalene, and that the catalytic activity of MnO2 could be higher than that of Fe2O3. Under the wet electrode gas, the promoting action of catalytic coating on naphthalene degradation was more marked than the dry electrode gas. The degradation product was CO2 mainly, but due to the incomplete property of oxidation reaction, also had little amount of CO and organic matter of small molecule produced.