Adsorption and desorption of VOCs on the ZSM-5 zeolite
In this study,the changes in hydrophobieity 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.
NETL
NSTL
万方数据
维普
