等离子体联合纳米技术降解甲苯废气的研究

Degradation of toluene in exhaust gas with plasma and nano-materials

以自制的纳米材料作为催化剂,利用低温等离子体联合纳米技术研究了不同电场强度、不同填料情况下的甲苯的降解,初步探讨了等离子体催化降解甲苯的机理,分析了降解产物.结果表明,甲苯降解率随电场强度的提高而上升;随反应器内填料变化[无填料(1),普通填料(2),镀有普通钛酸钡的介电填料(3)和镀有纳米催化剂的填料(4)],降解率(η)呈现为η(4)>η(3)>η(2)>η(1),最高可达95%.能量分配率(R)为R(1)>R(2)>R(3)>R(4).纳米钛酸钡基介电材料作为等离子体反应器内的填充材料,处理同量甲苯废气其消耗功率要低于填充其他填料的等离子体反应器.通过GC-MS分析,中间产物包括醛、醇、酰胺及带有苯环的衍生物等有机物,但电场强度足够高时,甲苯分子最终可被氧化成CO2、CO和H2O.

Non-thermal plasma associated with nano-catalyst （made by myself） was used to degrade toluene under different electric field and packed materials. At the same time, the mechanism of toluene degradation using plasma and catalyst was discussed. Degradation of toluene increased with increase of electric field strength and decrease of flow velocity and initial concentration. There were four conditions in plasma without packed materials （1）, with packed materials（2）, with BaTiO3 in the surfaces of packed materials（3）, and with nano-materials Ba0.8Sr0.2Zr0.1Ti0.9O3（4）. Degradation of toluene decomposition represented an obvious trend, that was, η（4） 〉v（3）〉v（2）〉η（1）. The best removal efficiency of toluene arrived at 95%. The distribution ratio of energy showed as R（1） 〉R（2）〉R（3）〉R（4）. As packed materials in reactor, nano-material could reduce power consumption on treating with the same quantity of toluene. Middle-of-the-products include aldehyde, alcohols amide, and benzene derivative were analyzed by GC-MS. If electric field strength was enough strong, the final resultants would be CO2, CO and H2O.