吸附增效低温等离子体法去除甲苯废气的研究

采用150Hz中频高压交流电源作为低温等离子体发生源,选用典型的微孔γ-Al2O3球形颗粒吸附剂(以下简称γ-Al2O3)作为等离子体反应器填充材料,协同低温等离子体法催化降解甲苯废气。考察了在不同条件下,γ-Al2O3的甲苯吸脱附效果和吸附增效低温等离子体法的甲苯去除效果。结果表明,甲苯降解反应主要发生在γ-Al2O3的表面,甲苯的去除率在一定的浓度范围内与γ-Al2O3表面吸附的甲苯量成正比关系;填充γ-Al2O3有利于提高甲苯去除率及等离子体反应器能量利用率;γ-Al2O3对臭氧的降解表现出一定的促进作用。

Decomposition of toluene by adsorption enhanced non-thermal plasma

In this paper, the adsorption enhanced non-thermal plasma was employed for the decomposition of toluene. Alternating current high voltage with intermediate frequency of 150 Hz was used to produce non-thermal plasma, and γAl_2O_3 pellets were chosen to pack into the reactor as sorbent. The adsorption and desorption of toluene on γAl_2O_3 pellets under different conditions were reviewed, and the toluene removal efficiency of adsorption en-hanced non-thermal plasma process was investigated. The result showed that the decomposition of toluene took place in the surface of γAl_2O_3 pellets; in the appropriate concentration range, the toluene removal efficiency was positive proportional to amount of toluene that adsorbed on γAl_2O_3 pellets; compared with the single non-thermal plasma technology, the packed γAl_2O_3 pellets resulted in greater enhancement of toluene removal efficiency and energy effi-ciency and a better inhibition for O_3 formation in the gas exhaust.