黄海凤,戎文娟,顾勇义,常仁芹,卢晗锋.ZSM-5沸石分子筛吸附-脱附VOCs的性能研究[J].环境科学学报,2014,34(12):3144-3151
ZSM-5沸石分子筛吸附-脱附VOCs的性能研究
- Adsorption and desorption of VOCs on the ZSM-5 zeolite
- 基金项目：国家自然科学基金(No.21107096);浙江省自然科学基金(No.Y14E080035);浙江省重大科技专项(No.2013C03021)
- 黄海凤
- 浙江工业大学生物与环境工程学院, 杭州 310014
- 戎文娟
- 浙江工业大学生物与环境工程学院, 杭州 310014
- 顾勇义
- 浙江工业大学生物与环境工程学院, 杭州 310014
- 常仁芹
- 浙江工业大学化学工程与材料科学学院, 催化反应工程研究所, 杭州 310014
- 卢晗锋
- 浙江工业大学化学工程与材料科学学院, 催化反应工程研究所, 杭州 310014
- 摘要：以不同Si/Al比的ZSM-5分子筛为吸附剂,考察了硅铝比对其疏水性和吸附性能的影响.结果表明,随着 Si/Al比的增加,其微孔孔体积和微孔表面积变大,当Si/Al>100时,ZSM-5分子筛均具有良好的疏水性和对甲苯的选择性吸附能力,但脱附温度随之升高.同时,以4类VOCs(醇类、酯类、烃类、酮类)为吸附质,研究了ZSM-5分子筛吸附-脱附不同VOCs的性能.发现ZSM-5分子筛由于具有丰富的微孔结构更适合吸附小分子VOCs,对于同类VOCs分子,随着碳数的增加,分子大小和极性均增大,其与分子筛的作用力越强,热脱附温度越高,但VOCs在ZSM-5分子筛表面300 ℃左右就能脱附完全.
- Abstract：In this study, the changes in hydrophobicity and toluene adsorption/desorption properties of ZSM-5 zeolite (a commercial zeolite) as a function of Si/Al ratio were investigated. Our results indicated that the micropore volume and surface area increased with increasing Si/Al ratio. When Si/Al ratio was >100, ZSM-5 zeolite was hydrophobic and exhibited an enhanced selectivity for toluene adsorption. Further, the adsorption and desorption characteristics of different VOCs on the ZSM-5 zeolite were studied, using four types of VOCs including alcohols, esters, hydrocarbons and ketones. The results suggested that interaction between zeolite and the VOCs were stronger as the molecular size (number of carbons) and the polarity of the VOCs increased. As a result, for molecules having the same functional groups, the VOC desorption temperature was higher for molecules with higher number of carbons. Nevertheless, all the VOCs tested had desorption temperatures lower than 300℃. The results also indicated that, because of its high porosity, ZSM-5 zeolite may be more suitable for the adsorption of VOCs with smaller molecular sizes.
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