不同吸附剂上动态吸附-脱附挥发性有机气体性能研究

Dynamic adsorption and desorption of volatile organic compounds on different adsorbents

采用气相色谱法和热重分析(TG)研究了活性炭以及5A、NaY、13X、ZSM-5(SiO 2/Al 2O 3=27、300)、Hβ和MCM-41分子筛对正己烷、甲苯和乙酸乙酯的动态吸附-脱附性能,系统考察了挥发性有机气体(VOCs)浓度与种类及体积空速对吸附容量的影响。结果表明,增加体积空速和VOCs浓度,一定程度上能够提升吸附容量;活性炭吸附剂对三种VOCs具有较高的单位质量吸附量,而13X与NaY对三种VOCs具有更大的单位体积吸附量。

The dynamic adsorption and desorption behaviors of volatile organic compounds(VOCs,including n-hexane,toluene and ethyl acetate)on various adsorbents(including activated carbon and 5A,NaY,13X,ZSM-5(SiO 2/Al 2O 3=27 and 300),Hβand MCM-41 zeolites)were investigated by gas chromatography and thermogravimetic(TG)analysis;the effect of type,volumetric space velocity(SV)and concentration of VOC on the adsorption capacities was considered.The results show that more VOCs can be adsorbed at higher SV and concentration of VOCs to a certain extent.Activated carbon exhibits the largest adsorption capacity per unit mass towards the VOCs considered in this work,whereas the 13X and NaY zeolites display larger adsorption capacity per unit volume than other adsorbents.